From d31ebf4619806ebfdff4333222d29b1ba784809b Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Fri, 21 Aug 2020 09:43:24 +0800
Subject: [PATCH] Test: Improve coverage (#8811)

---
 jest.config.js                                |   8 +-
 src/cli/expand-patterns.js                    |   2 +
 src/cli/util.js                               |  20 ++-
 src/common/fast-path.js                       |   1 +
 src/common/util.js                            |  12 ++
 src/language-css/loc.js                       |  11 +-
 src/language-css/parser-postcss.js            |   8 ++
 src/language-css/printer-postcss.js           |   2 +
 src/language-css/utils.js                     |   4 +
 src/language-graphql/parser-graphql.js        |   1 +
 src/language-graphql/printer-graphql.js       |   5 +-
 src/language-handlebars/parser-glimmer.js     |   4 +-
 src/language-html/parser-html.js              |   4 +
 src/language-html/printer-html.js             |  25 ++--
 src/language-html/utils.js                    |  11 +-
 src/language-js/clean.js                      |  32 -----
 src/language-js/parser-typescript.js          |   1 +
 src/language-js/print/member-chain.js         |   1 +
 src/language-js/printer-estree.js             |   3 +
 src/language-js/utils.js                      |   2 +-
 src/language-markdown/index.js                |   1 +
 src/language-markdown/mdx.js                  |   1 +
 src/language-markdown/printer-markdown.js     |  12 +-
 src/language-yaml/parser-yaml.js              |  19 ++-
 src/language-yaml/printer-yaml.js             |   2 +
 src/language-yaml/utils.js                    |   2 +
 src/main/comments.js                          |   3 +
 src/main/core.js                              |   1 +
 src/main/multiparser.js                       |   1 +
 src/main/options-normalizer.js                |   3 +
 src/main/options.js                           |   6 +
 src/main/parser.js                            |  26 ++--
 src/main/range-util.js                        |   1 +
 src/utils/front-matter.js                     |  19 +--
 src/utils/line-column-to-index.js             |   3 -
 .../__snapshots__/jsfmt.spec.js.snap          |  29 +++++
 .../type-extension-definition/jsfmt.spec.js   |   1 +
 .../type-extendsion-syntax.graphql            |   8 ++
 .../cdata/__snapshots__/jsfmt.spec.js.snap    |   9 ++
 tests/html/cdata/example.html                 |   3 +
 .../srcset/__snapshots__/jsfmt.spec.js.snap   |  41 +++++++
 tests/html/srcset/invalid.html                |  12 ++
 tests/html/srcset/jsfmt.spec.js               |   1 +
 tests/js/bom/__snapshots__/jsfmt.spec.js.snap |  26 ++++
 tests/js/eol/__snapshots__/jsfmt.spec.js.snap | 109 ++++++++++++++++
 tests/js/eol/cursor-and-range.js              |   7 ++
 .../js/range/__snapshots__/jsfmt.spec.js.snap |  24 ++++
 tests/js/range/array.js                       |   9 ++
 .../footnote/__snapshots__/jsfmt.spec.js.snap |  15 +++
 tests/markdown/footnote/footnote.md           |   1 +
 .../in-html/__snapshots__/jsfmt.spec.js.snap  | 116 ++++++++++++++++++
 .../in-html/front-matter-toml.html            |   9 ++
 .../in-html/front-matter-yaml.html            |   9 ++
 .../__snapshots__/jsfmt.spec.js.snap          |  11 ++
 tests/misc/errors/handlebars/invalid.hbs      |   2 +
 tests/misc/errors/handlebars/jsfmt.spec.js    |   1 +
 .../less/__snapshots__/jsfmt.spec.js.snap     |  20 ++-
 ...{inline-comment.js => inline-comment.less} |   0
 tests/misc/errors/less/open-double-quote.less |   3 +
 tests/misc/errors/less/open-sigle-quote.less  |   3 +
 .../v-for/__snapshots__/jsfmt.spec.js.snap    |  21 ++++
 tests/vue/v-for/invalid.vue                   |   5 +
 tests/vue/v-for/jsfmt.spec.js                 |   1 +
 .../vue/vue/__snapshots__/jsfmt.spec.js.snap  |  24 ++++
 tests/vue/vue/attributes.vue                  |   4 +
 .../__snapshots__/config-invalid.js.snap      |   4 +
 .../__tests__/__snapshots__/debug-api.js.snap |  16 +++
 .../__tests__/__snapshots__/file-info.js.snap |  10 ++
 .../__snapshots__/stdin-filepath.js.snap      |  22 ++++
 tests_integration/__tests__/config-invalid.js |  12 ++
 .../__tests__/config-resolution.js            |  29 +++++
 tests_integration/__tests__/debug-api.js      |  44 +++++++
 tests_integration/__tests__/file-info.js      |  10 ++
 tests_integration/__tests__/invalid-ignore.js |  13 ++
 .../__tests__/plugin-options-string.js        |  15 +++
 .../__tests__/resolve-config-file.js          |  15 +++
 tests_integration/__tests__/stdin-filepath.js |  51 ++++++++
 tests_integration/__tests__/third-party.js    |   6 +-
 .../cli/config/invalid/type-error/.prettierrc |   1 +
 .../overrides-exclude-files/.prettierrc       |  19 +++
 80 files changed, 924 insertions(+), 124 deletions(-)
 create mode 100644 tests/graphql/type-extension-definition/__snapshots__/jsfmt.spec.js.snap
 create mode 100644 tests/graphql/type-extension-definition/jsfmt.spec.js
 create mode 100644 tests/graphql/type-extension-definition/type-extendsion-syntax.graphql
 create mode 100644 tests/html/srcset/__snapshots__/jsfmt.spec.js.snap
 create mode 100644 tests/html/srcset/invalid.html
 create mode 100644 tests/html/srcset/jsfmt.spec.js
 create mode 100644 tests/js/eol/cursor-and-range.js
 create mode 100644 tests/js/range/array.js
 create mode 100644 tests/markdown/footnote/footnote.md
 create mode 100644 tests/misc/embedded_language_formatting/in-html/front-matter-toml.html
 create mode 100644 tests/misc/embedded_language_formatting/in-html/front-matter-yaml.html
 create mode 100644 tests/misc/errors/handlebars/__snapshots__/jsfmt.spec.js.snap
 create mode 100644 tests/misc/errors/handlebars/invalid.hbs
 create mode 100644 tests/misc/errors/handlebars/jsfmt.spec.js
 rename tests/misc/errors/less/{inline-comment.js => inline-comment.less} (100%)
 create mode 100644 tests/misc/errors/less/open-double-quote.less
 create mode 100644 tests/misc/errors/less/open-sigle-quote.less
 create mode 100644 tests/vue/v-for/__snapshots__/jsfmt.spec.js.snap
 create mode 100644 tests/vue/v-for/invalid.vue
 create mode 100644 tests/vue/v-for/jsfmt.spec.js
 create mode 100644 tests_integration/__tests__/__snapshots__/debug-api.js.snap
 create mode 100644 tests_integration/__tests__/debug-api.js
 create mode 100644 tests_integration/__tests__/resolve-config-file.js
 create mode 100644 tests_integration/cli/config/invalid/type-error/.prettierrc
 create mode 100644 tests_integration/cli/config/overrides-exclude-files/.prettierrc

diff --git a/jest.config.js b/jest.config.js
index 9fa555fa4..2a5171e64 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -19,12 +19,8 @@ module.exports = {
     ? ["<rootDir>/tests_integration/"]
     : [],
   collectCoverage: ENABLE_CODE_COVERAGE,
-  collectCoverageFrom: ["src/**/*.js", "index.js", "!<rootDir>/node_modules/"],
-  coveragePathIgnorePatterns: [
-    "<rootDir>/standalone.js",
-    "<rootDir>/src/document/doc-debug.js",
-    "<rootDir>/src/main/massage-ast.js",
-  ],
+  collectCoverageFrom: ["<rootDir>/src/**/*.js", "<rootDir>/bin/**/*.js"],
+  coveragePathIgnorePatterns: ["<rootDir>/src/document/doc-debug.js"],
   coverageReporters: ["text", "lcov"],
   moduleNameMapper: {
     "prettier/local": "<rootDir>/tests_config/require_prettier.js",
diff --git a/src/cli/expand-patterns.js b/src/cli/expand-patterns.js
index b3034c884..346301ad0 100644
--- a/src/cli/expand-patterns.js
+++ b/src/cli/expand-patterns.js
@@ -109,7 +109,9 @@ function* expandPatternsInternal(context) {
     try {
       result = fastGlob.sync(glob, globOptions);
     } catch ({ message }) {
+      /* istanbul ignore next */
       yield { error: `${errorMessages.globError[type]}: ${input}\n${message}` };
+      /* istanbul ignore next */
       continue;
     }
 
diff --git a/src/cli/util.js b/src/cli/util.js
index 3065e69e0..6f963a763 100644
--- a/src/cli/util.js
+++ b/src/cli/util.js
@@ -61,6 +61,8 @@ function diff(a, b) {
 
 function handleError(context, filename, error) {
   if (error instanceof errors.UndefinedParserError) {
+    // Can't test on CI, `isTTY()` is always false, see ./is-tty.js
+    /* istanbul ignore next */
     if ((context.argv.write || context.argv["ignore-unknown"]) && isTTY()) {
       readline.clearLine(process.stdout, 0);
       readline.cursorTo(process.stdout, 0, null);
@@ -96,6 +98,7 @@ function handleError(context, filename, error) {
     context.logger.error(`${filename}: ${error.message}`);
   } else {
     // `invalid.js: Error: Some unexpected error\n[stack trace]`
+    /* istanbul ignore next */
     context.logger.error(filename + ": " + (error.stack || error));
   }
 
@@ -364,7 +367,10 @@ function applyConfigPrecedence(context, options) {
         return options || parseArgsToOptions(context);
     }
   } catch (error) {
+    /* istanbul ignore next */
     context.logger.error(error.toString());
+
+    /* istanbul ignore next */
     process.exit(2);
   }
 }
@@ -467,13 +473,19 @@ function formatFiles(context) {
       input = fs.readFileSync(filename, "utf8");
     } catch (error) {
       // Add newline to split errors from filename line.
+      /* istanbul ignore next */
       context.logger.log("");
 
+      /* istanbul ignore next */
       context.logger.error(
         `Unable to read file: ${filename}\n${error.message}`
       );
+
       // Don't exit the process if one file failed
+      /* istanbul ignore next */
       process.exitCode = 2;
+
+      /* istanbul ignore next */
       continue;
     }
 
@@ -514,16 +526,20 @@ function formatFiles(context) {
         try {
           fs.writeFileSync(filename, output, "utf8");
         } catch (error) {
+          /* istanbul ignore next */
           context.logger.error(
             `Unable to write file: ${filename}\n${error.message}`
           );
+
           // Don't exit the process if one file failed
+          /* istanbul ignore next */
           process.exitCode = 2;
         }
       } else if (!context.argv.check && !context.argv["list-different"]) {
         context.logger.log(`${chalk.grey(filename)} ${Date.now() - start}ms`);
       }
     } else if (context.argv["debug-check"]) {
+      /* istanbul ignore else */
       if (result.filepath) {
         context.logger.log(result.filepath);
       } else {
@@ -769,8 +785,6 @@ function createLogger(logLevel) {
     switch (logLevel) {
       case "silent":
         return false;
-      default:
-        return true;
       case "debug":
         if (loggerName === "debug") {
           return true;
@@ -804,6 +818,7 @@ function normalizeDetailedOption(name, option) {
           deprecated: false,
           ...(typeof choice === "object" ? choice : { value: choice }),
         };
+        /* istanbul ignore next */
         if (newChoice.value === true) {
           newChoice.value = ""; // backward compatibility for original boolean option
         }
@@ -873,6 +888,7 @@ function createDetailedOptionMap(supportOptions) {
         forwardToApi: option.name,
       };
 
+      /* istanbul ignore next */
       if (option.deprecated) {
         delete newOption.forwardToApi;
         delete newOption.description;
diff --git a/src/common/fast-path.js b/src/common/fast-path.js
index 3a4a7b157..61b5883d6 100644
--- a/src/common/fast-path.js
+++ b/src/common/fast-path.js
@@ -144,6 +144,7 @@ class FastPath {
     let node = this.stack[stackPointer--];
 
     for (const predicate of predicates) {
+      /* istanbul ignore next */
       if (node === undefined) {
         return false;
       }
diff --git a/src/common/util.js b/src/common/util.js
index 528931f69..55b33450f 100644
--- a/src/common/util.js
+++ b/src/common/util.js
@@ -23,6 +23,7 @@ function skip(chars) {
 
     // Allow `skip` functions to be threaded together without having
     // to check for failures (did someone say monads?).
+    /* istanbul ignore next */
     if (index === false) {
       return false;
     }
@@ -76,6 +77,7 @@ const skipEverythingButNewLine = skip(/[^\n\r]/);
  * @returns {number | false}
  */
 function skipInlineComment(text, index) {
+  /* istanbul ignore next */
   if (index === false) {
     return false;
   }
@@ -96,6 +98,7 @@ function skipInlineComment(text, index) {
  * @returns {number | false}
  */
 function skipTrailingComment(text, index) {
+  /* istanbul ignore next */
   if (index === false) {
     return false;
   }
@@ -123,6 +126,8 @@ function skipNewline(text, index, opts) {
 
   const atIndex = text.charAt(index);
   if (backwards) {
+    // We already replace `\r\n` with `\n` before parsing
+    /* istanbul ignore next */
     if (text.charAt(index - 1) === "\r" && atIndex === "\n") {
       return index - 2;
     }
@@ -135,6 +140,8 @@ function skipNewline(text, index, opts) {
       return index - 1;
     }
   } else {
+    // We already replace `\r\n` with `\n` before parsing
+    /* istanbul ignore next */
     if (atIndex === "\r" && text.charAt(index + 1) === "\n") {
       return index + 2;
     }
@@ -277,6 +284,8 @@ function getNextNonSpaceNonCommentCharacter(text, node, locEnd) {
   );
 }
 
+// Not using, but it's public utils
+/* istanbul ignore next */
 /**
  * @param {string} text
  * @param {number} index
@@ -577,6 +586,7 @@ function addCommentHelper(node, comment) {
   // For some reason, TypeScript parses `// x` inside of JSXText as a comment
   // We already "print" it via the raw text, we don't need to re-print it as a
   // comment
+  /* istanbul ignore next */
   if (node.type === "JSXText") {
     comment.printed = true;
   }
@@ -603,6 +613,8 @@ function addTrailingComment(node, comment) {
   addCommentHelper(node, comment);
 }
 
+// Not using
+/* istanbul ignore next */
 function isWithinParentArrayProperty(path, propertyName) {
   const node = path.getValue();
   const parent = path.getParentNode();
diff --git a/src/language-css/loc.js b/src/language-css/loc.js
index 5c2b8acaf..0edf10658 100644
--- a/src/language-css/loc.js
+++ b/src/language-css/loc.js
@@ -4,13 +4,12 @@ const lineColumnToIndex = require("../utils/line-column-to-index");
 const { getLast, skipEverythingButNewLine } = require("../common/util");
 
 function calculateLocStart(node, text) {
-  if (node.source) {
-    if (typeof node.source.sourceIndex === "number") {
-      return node.source.sourceIndex; // value-* nodes have this
-    }
-    return lineColumnToIndex(node.source.start, text) - 1;
+  // value-* nodes have this
+  if (typeof node.sourceIndex === "number") {
+    return node.sourceIndex;
   }
-  return null;
+
+  return node.source ? lineColumnToIndex(node.source.start, text) - 1 : null;
 }
 
 function calculateLocEnd(node, text) {
diff --git a/src/language-css/parser-postcss.js b/src/language-css/parser-postcss.js
index 76cb43857..e8e503d49 100644
--- a/src/language-css/parser-postcss.js
+++ b/src/language-css/parser-postcss.js
@@ -109,6 +109,7 @@ function parseValueNode(valueNode, options) {
       }
       parenGroup.close = node;
 
+      /* istanbul ignore next */
       if (commaGroupStack.length === 1) {
         throw new Error("Unbalanced parenthesis");
       }
@@ -270,6 +271,7 @@ function parseMediaQuery(params) {
     result = mediaParser(params);
   } catch (e) {
     // Ignore bad media queries
+    /* istanbul ignore next */
     return {
       type: "selector-unknown",
       value: params,
@@ -294,6 +296,7 @@ function parseNestedCSS(node, options) {
       return node;
     }
 
+    /* istanbul ignore next */
     if (!node.raws) {
       node.raws = {};
     }
@@ -352,10 +355,14 @@ function parseNestedCSS(node, options) {
 
     // Ignore LESS mixin declaration
     if (selector.trim().length > 0) {
+      // TODO: confirm this code is dead
+      /* istanbul ignore next */
       if (selector.startsWith("@") && selector.endsWith(":")) {
         return node;
       }
 
+      // TODO: confirm this code is dead
+      /* istanbul ignore next */
       // Ignore LESS mixins
       if (node.mixin) {
         node.selector = parseValue(selector, options);
@@ -581,6 +588,7 @@ function parseWithParser(parse, text, options) {
   try {
     result = parse(text);
   } catch (e) {
+    /* istanbul ignore next */
     if (typeof e.line !== "number") {
       throw e;
     }
diff --git a/src/language-css/printer-postcss.js b/src/language-css/printer-postcss.js
index 6cdd0f6de..c51479b99 100644
--- a/src/language-css/printer-postcss.js
+++ b/src/language-css/printer-postcss.js
@@ -941,6 +941,8 @@ function genericPrint(path, options, print) {
           : line,
       ]);
     }
+    // TODO: confirm this code is dead
+    /* istanbul ignore next */
     case "value-comma": {
       return concat([node.value, " "]);
     }
diff --git a/src/language-css/utils.js b/src/language-css/utils.js
index cac78875a..873142919 100644
--- a/src/language-css/utils.js
+++ b/src/language-css/utils.js
@@ -175,6 +175,8 @@ function isURLFunctionNode(node) {
 
 function isLastNode(path, node) {
   const parentNode = path.getParentNode();
+
+  /* istanbul ignore next */
   if (!parentNode) {
     return false;
   }
@@ -186,6 +188,7 @@ function isDetachedRulesetDeclarationNode(node) {
   // If a Less file ends up being parsed with the SCSS parser, Less
   // variable declarations will be parsed as atrules with names ending
   // with a colon, so keep the original case then.
+  /* istanbul ignore next */
   if (!node.selector) {
     return false;
   }
@@ -261,6 +264,7 @@ function isSCSSControlDirectiveNode(node) {
 }
 
 function isSCSSNestedPropertyNode(node) {
+  /* istanbul ignore next */
   if (!node.selector) {
     return false;
   }
diff --git a/src/language-graphql/parser-graphql.js b/src/language-graphql/parser-graphql.js
index d92d39b9f..d0c801e49 100644
--- a/src/language-graphql/parser-graphql.js
+++ b/src/language-graphql/parser-graphql.js
@@ -66,6 +66,7 @@ function parse(text /*, parsers, opts*/) {
         },
       });
     } else {
+      /* istanbul ignore next */
       throw error;
     }
   }
diff --git a/src/language-graphql/printer-graphql.js b/src/language-graphql/printer-graphql.js
index 22fa0a206..637a4f262 100644
--- a/src/language-graphql/printer-graphql.js
+++ b/src/language-graphql/printer-graphql.js
@@ -275,10 +275,6 @@ function genericPrint(path, options, print) {
       ]);
     }
 
-    case "TypeExtensionDefinition": {
-      return concat(["extend ", path.call(print, "definition")]);
-    }
-
     case "ObjectTypeExtension":
     case "ObjectTypeDefinition": {
       return concat([
@@ -645,6 +641,7 @@ function printComment(commentPath) {
     return "#" + comment.value.trimEnd();
   }
 
+  /* istanbul ignore next */
   throw new Error("Not a comment: " + JSON.stringify(comment));
 }
 
diff --git a/src/language-handlebars/parser-glimmer.js b/src/language-handlebars/parser-glimmer.js
index 8fbbe600e..007717e3c 100644
--- a/src/language-handlebars/parser-glimmer.js
+++ b/src/language-handlebars/parser-glimmer.js
@@ -8,9 +8,9 @@ function parse(text, parsers, options) {
   let ast;
   try {
     ast = glimmer(text, { mode: "codemod" });
-    /* istanbul ignore next */
   } catch (error) {
     const matches = error.message.match(/on line (\d+)/);
+    /* istanbul ignore else */
     if (matches) {
       throw createError(error.message, {
         start: { line: Number(matches[1]), column: 0 },
@@ -32,9 +32,11 @@ module.exports = {
       // https://prettier.io/docs/en/plugins.html#parsers
       // but we need access to the original text to use
       // `loc.start` and `loc.end` objects to calculate the offset
+      /* istanbul ignore next */
       locStart(node) {
         return node.loc && node.loc.start;
       },
+      /* istanbul ignore next */
       locEnd(node) {
         return node.loc && node.loc.end;
       },
diff --git a/src/language-html/parser-html.js b/src/language-html/parser-html.js
index bbac18cb6..7b1a93f7d 100644
--- a/src/language-html/parser-html.js
+++ b/src/language-html/parser-html.js
@@ -59,6 +59,7 @@ function ngHtmlParser(
 
   if (options.parser === "vue" && !isVueHtml) {
     const shouldParseAsHTML = (node) => {
+      /* istanbul ignore next */
       if (!node) {
         return false;
       }
@@ -99,6 +100,7 @@ function ngHtmlParser(
           const endOffset = endSourceSpan.start.offset;
           for (const error of result.errors) {
             const { offset } = error.span.start;
+            /* istanbul ignore next */
             if (startOffset < offset && offset < endOffset) {
               errors = [error];
               break;
@@ -145,6 +147,7 @@ function ngHtmlParser(
     } else if (node instanceof Text) {
       node.type = "text";
     } else {
+      /* istanbul ignore next */
       throw new Error(`Unexpected node ${JSON.stringify(node)}`);
     }
   };
@@ -299,6 +302,7 @@ function _parse(text, options, parserOptions, shouldParseFrontMatter = true) {
     );
     const firstText = subAst.children[0];
     if (firstText.length === offset) {
+      /* istanbul ignore next */
       subAst.children.shift();
     } else {
       firstText.sourceSpan = new ParseSourceSpan(
diff --git a/src/language-html/printer-html.js b/src/language-html/printer-html.js
index c4c8e74e4..fc8e99a13 100644
--- a/src/language-html/printer-html.js
+++ b/src/language-html/printer-html.js
@@ -78,21 +78,11 @@ function embed(path, print, textToDoc, options) {
           return;
         }
 
-        let doc;
-        try {
-          doc = textToDoc(
-            htmlTrimPreserveIndentation(getNodeContent(node, options)),
-            { parser },
-            { stripTrailingHardline: true }
-          );
-        } catch (_) {
-          return;
-        }
-
-        // `textToDoc` don't throw on `production` mode
-        if (!doc) {
-          return;
-        }
+        const doc = textToDoc(
+          htmlTrimPreserveIndentation(getNodeContent(node, options)),
+          { parser },
+          { stripTrailingHardline: true }
+        );
 
         return concat([
           printOpeningTagPrefix(node, options),
@@ -446,10 +436,8 @@ function genericPrint(path, options, print) {
         ]),
       ]);
     }
-    case "yaml":
-    case "toml":
-      return concat(replaceEndOfLineWith(node.raw, literalline));
     default:
+      /* istanbul ignore next */
       throw new Error(`Unexpected node type ${node.type}`);
   }
 }
@@ -957,6 +945,7 @@ function printOpeningTagEndMarker(node) {
 
 function printClosingTagStartMarker(node, options) {
   assert(!node.isSelfClosing);
+  /* istanbul ignore next */
   if (shouldNotPrintClosingTag(node, options)) {
     return "";
   }
diff --git a/src/language-html/utils.js b/src/language-html/utils.js
index 19ae1285f..6424395ec 100644
--- a/src/language-html/utils.js
+++ b/src/language-html/utils.js
@@ -92,10 +92,12 @@ function shouldPreserveContent(node, options) {
 }
 
 function hasPrettierIgnore(node) {
+  /* istanbul ignore next */
   if (node.type === "attribute") {
     return false;
   }
 
+  /* istanbul ignore next */
   if (!node.parent) {
     return false;
   }
@@ -429,8 +431,6 @@ function inferScriptParser(node, options) {
       getParserName(node.attrMap.lang, options)
     );
   }
-
-  return null;
 }
 
 function isBlockLikeCssDisplay(cssDisplay) {
@@ -465,7 +465,7 @@ function isPreLikeNode(node) {
   return getNodeCssStyleWhiteSpace(node).startsWith("pre");
 }
 
-function countParents(path, predicate = () => true) {
+function countParents(path, predicate) {
   let counter = 0;
   for (let i = path.stack.length - 1; i >= 0; i--) {
     const value = path.stack[i];
@@ -591,10 +591,6 @@ function dedentString(text, minIndent = getMinIndentation(text)) {
         .join("\n");
 }
 
-function identity(x) {
-  return x;
-}
-
 function shouldNotPrintClosingTag(node, options) {
   return (
     !node.isSelfClosing &&
@@ -661,7 +657,6 @@ module.exports = {
   getNodeCssStyleWhiteSpace,
   getPrettierIgnoreAttributeCommentData,
   hasPrettierIgnore,
-  identity,
   inferScriptParser,
   isVueCustomBlock,
   isVueNonHtmlBlock,
diff --git a/src/language-js/clean.js b/src/language-js/clean.js
index ed818fa3f..94f2dd47c 100644
--- a/src/language-js/clean.js
+++ b/src/language-js/clean.js
@@ -54,38 +54,6 @@ function clean(ast, newObj, parent) {
     return null;
   }
 
-  // (TypeScript) Ignore `static` in `constructor(static p) {}`
-  // and `export` in `constructor(export p) {}`
-  if (
-    ast.type === "TSParameterProperty" &&
-    ast.accessibility === null &&
-    !ast.readonly
-  ) {
-    return {
-      type: "Identifier",
-      name: ast.parameter.name,
-      typeAnnotation: newObj.parameter.typeAnnotation,
-      decorators: newObj.decorators,
-    };
-  }
-
-  // (TypeScript) ignore empty `specifiers` array
-  if (
-    ast.type === "TSNamespaceExportDeclaration" &&
-    ast.specifiers &&
-    ast.specifiers.length === 0
-  ) {
-    delete newObj.specifiers;
-  }
-
-  // We convert <div></div> to <div />
-  if (ast.type === "JSXOpeningElement") {
-    delete newObj.selfClosing;
-  }
-  if (ast.type === "JSXElement") {
-    delete newObj.closingElement;
-  }
-
   // We change {'key': value} into {key: value}.
   // And {key: value} into {'key': value}.
   // Also for (some) number keys.
diff --git a/src/language-js/parser-typescript.js b/src/language-js/parser-typescript.js
index b995f4f55..ca5ede2bb 100644
--- a/src/language-js/parser-typescript.js
+++ b/src/language-js/parser-typescript.js
@@ -19,6 +19,7 @@ function parse(text, parsers, opts) {
       // suppose our guess is correct
       const e = firstError;
 
+      /* istanbul ignore next */
       if (typeof e.lineNumber === "undefined") {
         throw e;
       }
diff --git a/src/language-js/print/member-chain.js b/src/language-js/print/member-chain.js
index 15734d116..fa2cd2535 100644
--- a/src/language-js/print/member-chain.js
+++ b/src/language-js/print/member-chain.js
@@ -323,6 +323,7 @@ function printMemberChain(path, options, print) {
   }
 
   function printIndentedGroup(groups) {
+    /* istanbul ignore next */
     if (groups.length === 0) {
       return "";
     }
diff --git a/src/language-js/printer-estree.js b/src/language-js/printer-estree.js
index 2e728379e..66f2e0f34 100644
--- a/src/language-js/printer-estree.js
+++ b/src/language-js/printer-estree.js
@@ -3999,6 +3999,7 @@ function shouldPrintParamsWithoutParens(path, options) {
   }
 
   // Fallback default; should be unreachable
+  /* istanbul ignore next */
   return false;
 }
 
@@ -4757,6 +4758,7 @@ function printJSXElement(path, options, print) {
 
 function maybeWrapJSXElementInParens(path, elem, options) {
   const parent = path.getParentNode();
+  /* istanbul ignore next */
   if (!parent) {
     return elem;
   }
@@ -5285,6 +5287,7 @@ function printComment(commentPath, options) {
         .slice(options.locStart(comment), options.locEnd(comment))
         .trimEnd();
     default:
+      /* istanbul ignore next */
       throw new Error("Not a comment: " + JSON.stringify(comment));
   }
 }
diff --git a/src/language-js/utils.js b/src/language-js/utils.js
index cc45f3749..793f2c1c9 100644
--- a/src/language-js/utils.js
+++ b/src/language-js/utils.js
@@ -868,7 +868,7 @@ function isLastStatement(path) {
   const body = (parent.body || parent.consequent).filter(
     (stmt) => stmt.type !== "EmptyStatement"
   );
-  return body && body[body.length - 1] === node;
+  return body[body.length - 1] === node;
 }
 
 /**
diff --git a/src/language-markdown/index.js b/src/language-markdown/index.js
index 8d4318b06..318a691a4 100644
--- a/src/language-markdown/index.js
+++ b/src/language-markdown/index.js
@@ -27,6 +27,7 @@ const printers = {
 };
 
 const parsers = {
+  /* istanbul ignore next */
   get remark() {
     return require("./parser-markdown").parsers.remark;
   },
diff --git a/src/language-markdown/mdx.js b/src/language-markdown/mdx.js
index d73610de9..9a7ca3101 100644
--- a/src/language-markdown/mdx.js
+++ b/src/language-markdown/mdx.js
@@ -45,6 +45,7 @@ const tokenizeEsSyntax = (eat, value) => {
   }
 };
 
+/* istanbul ignore next */
 tokenizeEsSyntax.locator = (value /*, fromIndex*/) => {
   return isExport(value) || isImport(value) ? -1 : 1;
 };
diff --git a/src/language-markdown/printer-markdown.js b/src/language-markdown/printer-markdown.js
index dfc6171e1..c338ce9c5 100644
--- a/src/language-markdown/printer-markdown.js
+++ b/src/language-markdown/printer-markdown.js
@@ -258,12 +258,6 @@ function genericPrint(path, options, print) {
         style,
       ]);
     }
-    case "yaml":
-    case "toml":
-      return options.originalText.slice(
-        node.position.start.offset,
-        node.position.end.offset
-      );
     case "html": {
       const parentNode = path.getParentNode();
       const value =
@@ -385,6 +379,9 @@ function genericPrint(path, options, print) {
         ])
       );
     }
+    // `footnote` requires `.use(footnotes, {inlineNotes: true})`, we are not using this option
+    // https://github.com/remarkjs/remark-footnotes#optionsinlinenotes
+    /* istanbul ignore next */
     case "footnote":
       return concat(["[^", printChildren(path, options, print), "]"]);
     case "footnoteReference":
@@ -463,6 +460,7 @@ function genericPrint(path, options, print) {
     case "tableRow": // handled in "table"
     case "listItem": // handled in "list"
     default:
+      /* istanbul ignore next */
       throw new Error(`Unknown markdown type ${JSON.stringify(node.type)}`);
   }
 }
@@ -768,6 +766,8 @@ function printChildren(path, options, print, events) {
       if (!shouldNotPrePrintHardline(childNode, data)) {
         parts.push(hardline);
 
+        // Can't find a case to pass `shouldPrePrintTripleHardline`
+        /* istanbul ignore next */
         if (lastChildNode && TRAILING_HARDLINE_NODES.has(lastChildNode.type)) {
           if (shouldPrePrintTripleHardline(childNode, data)) {
             parts.push(hardline);
diff --git a/src/language-yaml/parser-yaml.js b/src/language-yaml/parser-yaml.js
index e7d8c3530..5b83bd74a 100644
--- a/src/language-yaml/parser-yaml.js
+++ b/src/language-yaml/parser-yaml.js
@@ -17,10 +17,12 @@ function parse(text) {
 
     return root;
   } catch (error) {
-    // istanbul ignore next
-    throw error && error.position
-      ? createError(error.message, error.position)
-      : error;
+    if (error && error.position) {
+      throw createError(error.message, error.position);
+    }
+
+    /* istanbul ignore next */
+    throw error;
   }
 }
 
@@ -28,8 +30,13 @@ const parser = {
   astFormat: "yaml",
   parse,
   hasPragma,
-  locStart: (node) => node.position.start.offset,
-  locEnd: (node) => node.position.end.offset,
+  locStart(node) {
+    return node.position.start.offset;
+  },
+  /* istanbul ignore next */
+  locEnd(node) {
+    return node.position.end.offset;
+  },
 };
 
 module.exports = {
diff --git a/src/language-yaml/printer-yaml.js b/src/language-yaml/printer-yaml.js
index 5b899ca7c..42a51a471 100644
--- a/src/language-yaml/printer-yaml.js
+++ b/src/language-yaml/printer-yaml.js
@@ -551,6 +551,7 @@ function align(n, doc) {
 }
 
 function isInlineNode(node) {
+  /* istanbul ignore next */
   if (!node) {
     return true;
   }
@@ -569,6 +570,7 @@ function isInlineNode(node) {
 }
 
 function isSingleLineNode(node) {
+  /* istanbul ignore next */
   if (!node) {
     return true;
   }
diff --git a/src/language-yaml/utils.js b/src/language-yaml/utils.js
index dd57e4dbb..d645938a8 100644
--- a/src/language-yaml/utils.js
+++ b/src/language-yaml/utils.js
@@ -165,6 +165,7 @@ function splitWithSingleSpace(text) {
 
   let lastPart;
   for (const part of text.split(/( +)/g)) {
+    /* istanbul ignore else */
     if (part !== " ") {
       if (lastPart === " ") {
         parts.push(part);
@@ -178,6 +179,7 @@ function splitWithSingleSpace(text) {
     lastPart = part;
   }
 
+  /* istanbul ignore next */
   if (lastPart === " ") {
     parts.push((parts.pop() || "") + " ");
   }
diff --git a/src/main/comments.js b/src/main/comments.js
index 2fc7962ab..acb834360 100644
--- a/src/main/comments.js
+++ b/src/main/comments.js
@@ -381,6 +381,7 @@ function findExpressionIndexForComment(quasis, comment, options) {
 function printLeadingComment(commentPath, options) {
   const comment = commentPath.getValue();
   const contents = printComment(commentPath, options);
+  /* istanbul ignore next */
   if (!contents) {
     return "";
   }
@@ -407,6 +408,7 @@ function printLeadingComment(commentPath, options) {
 function printTrailingComment(commentPath, options) {
   const comment = commentPath.getValue();
   const contents = printComment(commentPath, options);
+  /* istanbul ignore next */
   if (!contents) {
     return "";
   }
@@ -502,6 +504,7 @@ function printComments(path, print, options, needsSemi) {
 
     if (leading) {
       const contents = printLeadingComment(commentPath, options);
+      /* istanbul ignore next */
       if (!contents) {
         return;
       }
diff --git a/src/main/core.js b/src/main/core.js
index 35150d7e3..f7cb272f7 100644
--- a/src/main/core.js
+++ b/src/main/core.js
@@ -274,6 +274,7 @@ function format(text, opts) {
   if (!hasCursor) {
     opts.cursorOffset = -1;
   }
+  /* istanbul ignore next */
   if (opts.rangeStart < 0) {
     opts.rangeStart = 0;
   }
diff --git a/src/main/multiparser.js b/src/main/multiparser.js
index 023f9843c..26cc5c3ce 100644
--- a/src/main/multiparser.js
+++ b/src/main/multiparser.js
@@ -71,6 +71,7 @@ function textToDoc(
     return stripTrailingHardline(doc, true);
   }
 
+  /* istanbul ignore next */
   return doc;
 }
 
diff --git a/src/main/options-normalizer.js b/src/main/options-normalizer.js
index 43b63fd95..b93ddce28 100644
--- a/src/main/options-normalizer.js
+++ b/src/main/options-normalizer.js
@@ -161,6 +161,7 @@ function optionInfoToSchema(optionInfo, { isCLI, optionInfos }) {
       SchemaConstructor = vnopts.StringSchema;
       break;
     default:
+      /* istanbul ignore next */
       throw new Error(`Unexpected type ${optionInfo.type}`);
   }
 
@@ -174,6 +175,7 @@ function optionInfoToSchema(optionInfo, { isCLI, optionInfos }) {
     };
   }
 
+  /* istanbul ignore next */
   if (optionInfo.redirect) {
     handlers.redirect = (value) =>
       !value
@@ -186,6 +188,7 @@ function optionInfoToSchema(optionInfo, { isCLI, optionInfos }) {
           };
   }
 
+  /* istanbul ignore next */
   if (optionInfo.deprecated) {
     handlers.deprecated = true;
   }
diff --git a/src/main/options.js b/src/main/options.js
index 8b9bd6434..386e9eb99 100644
--- a/src/main/options.js
+++ b/src/main/options.js
@@ -105,12 +105,16 @@ function normalize(options, opts) {
 function getPlugin(options) {
   const { astFormat } = options;
 
+  // TODO: test this with plugins
+  /* istanbul ignore next */
   if (!astFormat) {
     throw new Error("getPlugin() requires astFormat to be set");
   }
   const printerPlugin = options.plugins.find(
     (plugin) => plugin.printers && plugin.printers[astFormat]
   );
+  // TODO: test this with plugins
+  /* istanbul ignore next */
   if (!printerPlugin) {
     throw new Error(`Couldn't find plugin for AST format "${astFormat}"`);
   }
@@ -119,6 +123,7 @@ function getPlugin(options) {
 }
 
 function getInterpreter(filepath) {
+  /* istanbul ignore next */
   if (typeof filepath !== "string") {
     return "";
   }
@@ -150,6 +155,7 @@ function getInterpreter(filepath) {
   } catch (err) {
     // There are some weird cases where paths are missing, causing Jest
     // failures. It's unclear what these correspond to in the real world.
+    /* istanbul ignore next */
     return "";
   } finally {
     try {
diff --git a/src/main/parser.js b/src/main/parser.js
index 2347fc9c8..c3928fd49 100644
--- a/src/main/parser.js
+++ b/src/main/parser.js
@@ -13,6 +13,8 @@ const ownDescriptor = Object.getOwnPropertyDescriptor;
 function getParsers(options) {
   const parsers = {};
   for (const plugin of options.plugins) {
+    // TODO: test this with plugins
+    /* istanbul ignore next */
     if (!plugin.parsers) {
       continue;
     }
@@ -48,18 +50,18 @@ function resolveParser(opts, parsers) {
       throw new ConfigError(
         `Couldn't resolve parser "${opts.parser}". Parsers must be explicitly added to the standalone bundle.`
       );
-    } else {
-      try {
-        return {
-          parse: eval("require")(path.resolve(process.cwd(), opts.parser)),
-          astFormat: "estree",
-          locStart,
-          locEnd,
-        };
-      } catch (err) {
-        /* istanbul ignore next */
-        throw new ConfigError(`Couldn't resolve parser "${opts.parser}"`);
-      }
+    }
+
+    try {
+      return {
+        parse: eval("require")(path.resolve(process.cwd(), opts.parser)),
+        astFormat: "estree",
+        locStart,
+        locEnd,
+      };
+    } catch (err) {
+      /* istanbul ignore next */
+      throw new ConfigError(`Couldn't resolve parser "${opts.parser}"`);
     }
   }
 }
diff --git a/src/main/range-util.js b/src/main/range-util.js
index a572a3c93..cf041748b 100644
--- a/src/main/range-util.js
+++ b/src/main/range-util.js
@@ -109,6 +109,7 @@ const graphqlSourceElements = new Set([
   "ScalarTypeDefinition",
 ]);
 function isSourceElement(opts, node) {
+  /* istanbul ignore next */
   if (node == null) {
     return false;
   }
diff --git a/src/utils/front-matter.js b/src/utils/front-matter.js
index 965977c57..bd1b83f5e 100644
--- a/src/utils/front-matter.js
+++ b/src/utils/front-matter.js
@@ -2,8 +2,7 @@
 
 const escape = require("escape-string-regexp");
 const {
-  builders: { hardline, literalline, concat, markAsRoot },
-  utils: { mapDoc },
+  builders: { hardline, concat, markAsRoot },
 } = require("../document");
 
 const DELIMITER_MAP = {
@@ -46,9 +45,7 @@ function print(node, textToDoc) {
   if (node.lang === "yaml") {
     const value = node.value.trim();
     const doc = value
-      ? replaceNewlinesWithLiterallines(
-          textToDoc(value, { parser: "yaml" }, { stripTrailingHardline: true })
-        )
+      ? textToDoc(value, { parser: "yaml" }, { stripTrailingHardline: true })
       : "";
     return markAsRoot(
       concat(["---", hardline, doc, doc ? hardline : "", "---"])
@@ -56,16 +53,4 @@ function print(node, textToDoc) {
   }
 }
 
-function replaceNewlinesWithLiterallines(doc) {
-  return mapDoc(doc, (currentDoc) =>
-    typeof currentDoc === "string" && currentDoc.includes("\n")
-      ? concat(
-          currentDoc
-            .split(/(\n)/g)
-            .map((v, i) => (i % 2 === 0 ? v : literalline))
-        )
-      : currentDoc
-  );
-}
-
 module.exports = { parse, print };
diff --git a/src/utils/line-column-to-index.js b/src/utils/line-column-to-index.js
index 1cb72bbad..09911a5b2 100644
--- a/src/utils/line-column-to-index.js
+++ b/src/utils/line-column-to-index.js
@@ -5,9 +5,6 @@ module.exports = function (lineColumn, text) {
   let index = 0;
   for (let i = 0; i < lineColumn.line - 1; ++i) {
     index = text.indexOf("\n", index) + 1;
-    if (index === -1) {
-      return -1;
-    }
   }
   return index + lineColumn.column;
 };
diff --git a/tests/graphql/type-extension-definition/__snapshots__/jsfmt.spec.js.snap b/tests/graphql/type-extension-definition/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..aa69d1311
--- /dev/null
+++ b/tests/graphql/type-extension-definition/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,29 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`type-extendsion-syntax.graphql format 1`] = `
+====================================options=====================================
+parsers: ["graphql"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+type User {
+  name: String
+  birthday: Int
+}
+
+extend type User {
+  age: Int
+}
+
+=====================================output=====================================
+type User {
+  name: String
+  birthday: Int
+}
+
+extend type User {
+  age: Int
+}
+
+================================================================================
+`;
diff --git a/tests/graphql/type-extension-definition/jsfmt.spec.js b/tests/graphql/type-extension-definition/jsfmt.spec.js
new file mode 100644
index 000000000..4612e6ac5
--- /dev/null
+++ b/tests/graphql/type-extension-definition/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, ["graphql"]);
diff --git a/tests/graphql/type-extension-definition/type-extendsion-syntax.graphql b/tests/graphql/type-extension-definition/type-extendsion-syntax.graphql
new file mode 100644
index 000000000..4b67be477
--- /dev/null
+++ b/tests/graphql/type-extension-definition/type-extendsion-syntax.graphql
@@ -0,0 +1,8 @@
+type User {
+  name: String
+  birthday: Int
+}
+
+extend type User {
+  age: Int
+}
diff --git a/tests/html/cdata/__snapshots__/jsfmt.spec.js.snap b/tests/html/cdata/__snapshots__/jsfmt.spec.js.snap
index 53980c95f..2ac87c24d 100644
--- a/tests/html/cdata/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/html/cdata/__snapshots__/jsfmt.spec.js.snap
@@ -8,8 +8,17 @@ printWidth: 80
 =====================================input======================================
 <span><![CDATA[<sender>John Smith</sender>]]></span>
 
+<span><![CDATA[1]]> a <![CDATA[2]]></span>
+<span><![CDATA[1]]> <br> <![CDATA[2]]></span>
+
 =====================================output=====================================
 <span><![CDATA[<sender>John Smith</sender>]]></span>
 
+<span><![CDATA[1]]> a <![CDATA[2]]></span>
+<span
+  ><![CDATA[1]]> <br />
+  <![CDATA[2]]></span
+>
+
 ================================================================================
 `;
diff --git a/tests/html/cdata/example.html b/tests/html/cdata/example.html
index e62ba2a30..df7ff8e62 100644
--- a/tests/html/cdata/example.html
+++ b/tests/html/cdata/example.html
@@ -1 +1,4 @@
 <span><![CDATA[<sender>John Smith</sender>]]></span>
+
+<span><![CDATA[1]]> a <![CDATA[2]]></span>
+<span><![CDATA[1]]> <br> <![CDATA[2]]></span>
diff --git a/tests/html/srcset/__snapshots__/jsfmt.spec.js.snap b/tests/html/srcset/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..502b9318a
--- /dev/null
+++ b/tests/html/srcset/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,41 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`invalid.html format 1`] = `
+====================================options=====================================
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<img src="a"
+srcset="
+ should-not-format  400w 100h,
+       should-not-format  500w 200h
+"
+ alt=""/>
+
+<img src="a"
+srcset="
+ should-not-format ,, should-not-format 0q,,,
+"
+ alt=""/>
+
+=====================================output=====================================
+<img
+  src="a"
+  srcset="
+ should-not-format  400w 100h,
+       should-not-format  500w 200h
+"
+  alt=""
+/>
+
+<img
+  src="a"
+  srcset="
+ should-not-format ,, should-not-format 0q,,,
+"
+  alt=""
+/>
+
+================================================================================
+`;
diff --git a/tests/html/srcset/invalid.html b/tests/html/srcset/invalid.html
new file mode 100644
index 000000000..7978c5469
--- /dev/null
+++ b/tests/html/srcset/invalid.html
@@ -0,0 +1,12 @@
+<img src="a"
+srcset="
+ should-not-format  400w 100h,
+       should-not-format  500w 200h
+"
+ alt=""/>
+
+<img src="a"
+srcset="
+ should-not-format ,, should-not-format 0q,,,
+"
+ alt=""/>
diff --git a/tests/html/srcset/jsfmt.spec.js b/tests/html/srcset/jsfmt.spec.js
new file mode 100644
index 000000000..53763df9b
--- /dev/null
+++ b/tests/html/srcset/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, ["html"]);
diff --git a/tests/js/bom/__snapshots__/jsfmt.spec.js.snap b/tests/js/bom/__snapshots__/jsfmt.spec.js.snap
index 61ed38cd0..a3dfa748b 100644
--- a/tests/js/bom/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/js/bom/__snapshots__/jsfmt.spec.js.snap
@@ -16,6 +16,32 @@ printWidth: 80
 ================================================================================
 `;
 
+exports[`snippet: cursor-and-range.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | 
+  2 | 
+> 3 | class    a {
+    |         ^^^^
+> 4 |   b(  <|> ) {}
+    | ^^^^^^^^^^^^^^
+  5 | }
+  6 | 
+  7 | let    x
+=====================================output=====================================
+
+
+class a {
+  b(<|>) {}
+}
+
+let    x
+================================================================================
+`;
+
 exports[`snippet: range-1.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel"]
diff --git a/tests/js/eol/__snapshots__/jsfmt.spec.js.snap b/tests/js/eol/__snapshots__/jsfmt.spec.js.snap
index 4e93e2e43..7f31a623f 100644
--- a/tests/js/eol/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/js/eol/__snapshots__/jsfmt.spec.js.snap
@@ -69,6 +69,115 @@ printWidth: 80
 ================================================================================
 `;
 
+exports[`cursor-and-range.js - {"endOfLine":"auto"} format 1`] = `
+====================================options=====================================
+endOfLine: "auto"
+parsers: ["babel"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | <LF>
+  2 | <LF>
+> 3 | class    a {<LF>
+    |         ^^^^<LF>
+> 4 |   b(  <|> ) {}<LF>
+    | ^^^^^^^^^^^^^^<LF>
+  5 | }<LF>
+  6 | <LF>
+  7 | let    x
+=====================================output=====================================
+** The EOL of output might not real when \`TEST_CRLF\` **
+<LF>
+<LF>
+class a {<LF>
+  b(<|>) {}<LF>
+}<LF>
+<LF>
+let    x
+================================================================================
+`;
+
+exports[`cursor-and-range.js - {"endOfLine":"cr"} format 1`] = `
+====================================options=====================================
+endOfLine: "cr"
+parsers: ["babel"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | <LF>
+  2 | <LF>
+> 3 | class    a {<LF>
+    |         ^^^^<LF>
+> 4 |   b(  <|> ) {}<LF>
+    | ^^^^^^^^^^^^^^<LF>
+  5 | }<LF>
+  6 | <LF>
+  7 | let    x
+=====================================output=====================================
+<CR>
+<CR>
+class a {<CR>
+  b(<|>) {}<CR>
+}<CR>
+<CR>
+let    x
+================================================================================
+`;
+
+exports[`cursor-and-range.js - {"endOfLine":"crlf"} format 1`] = `
+====================================options=====================================
+endOfLine: "crlf"
+parsers: ["babel"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | <LF>
+  2 | <LF>
+> 3 | class    a {<LF>
+    |         ^^^^<LF>
+> 4 |   b(  <|> ) {}<LF>
+    | ^^^^^^^^^^^^^^<LF>
+  5 | }<LF>
+  6 | <LF>
+  7 | let    x
+=====================================output=====================================
+<CRLF>
+<CRLF>
+class a {<CRLF>
+  b(<|>) {}<CRLF>
+}<CRLF>
+<CRLF>
+let    x
+================================================================================
+`;
+
+exports[`cursor-and-range.js - {"endOfLine":"lf"} format 1`] = `
+====================================options=====================================
+endOfLine: "lf"
+parsers: ["babel"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | <LF>
+  2 | <LF>
+> 3 | class    a {<LF>
+    |         ^^^^<LF>
+> 4 |   b(  <|> ) {}<LF>
+    | ^^^^^^^^^^^^^^<LF>
+  5 | }<LF>
+  6 | <LF>
+  7 | let    x
+=====================================output=====================================
+<LF>
+<LF>
+class a {<LF>
+  b(<|>) {}<LF>
+}<LF>
+<LF>
+let    x
+================================================================================
+`;
+
 exports[`range-1.js - {"endOfLine":"auto"} format 1`] = `
 ====================================options=====================================
 endOfLine: "auto"
diff --git a/tests/js/eol/cursor-and-range.js b/tests/js/eol/cursor-and-range.js
new file mode 100644
index 000000000..813dbfdef
--- /dev/null
+++ b/tests/js/eol/cursor-and-range.js
@@ -0,0 +1,7 @@
+
+
+class   <<<PRETTIER_RANGE_START>>> a {
+  b(  <|> ) {}<<<PRETTIER_RANGE_END>>>
+}
+
+let    x
\ No newline at end of file
diff --git a/tests/js/range/__snapshots__/jsfmt.spec.js.snap b/tests/js/range/__snapshots__/jsfmt.spec.js.snap
index a842fb8f2..99e03bb44 100644
--- a/tests/js/range/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/js/range/__snapshots__/jsfmt.spec.js.snap
@@ -1,5 +1,29 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`array.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "flow", "typescript"]
+printWidth: 80
+     |                                                                                | printWidth
+=====================================input======================================
+  1 | a = [
+  2 | ,
+> 3 | ,,,,
+    | ^^^^
+> 4 | 
+    | ^
+> 5 | ,
+    | ^
+> 6 | 
+    | ^
+  7 | ,
+  8 | a,
+  9 | ]
+=====================================output=====================================
+a = [, , , , , , , a];
+================================================================================
+`;
+
 exports[`class-declaration.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "flow", "typescript"]
diff --git a/tests/js/range/array.js b/tests/js/range/array.js
new file mode 100644
index 000000000..4cf65b0c9
--- /dev/null
+++ b/tests/js/range/array.js
@@ -0,0 +1,9 @@
+a = [
+,
+<<<PRETTIER_RANGE_START>>>,,,,
+
+,
+<<<PRETTIER_RANGE_END>>>
+,
+a,
+]
\ No newline at end of file
diff --git a/tests/markdown/footnote/__snapshots__/jsfmt.spec.js.snap b/tests/markdown/footnote/__snapshots__/jsfmt.spec.js.snap
index abfe09270..1812a7a44 100644
--- a/tests/markdown/footnote/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/markdown/footnote/__snapshots__/jsfmt.spec.js.snap
@@ -1,5 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`footnote.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+printWidth: 80
+proseWrap: "always"
+                                                                                | printWidth
+=====================================input======================================
+^[inline]
+
+=====================================output=====================================
+^[inline]
+
+================================================================================
+`;
+
 exports[`simple.md - {"proseWrap":"always"} format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
diff --git a/tests/markdown/footnote/footnote.md b/tests/markdown/footnote/footnote.md
new file mode 100644
index 000000000..324549a6e
--- /dev/null
+++ b/tests/markdown/footnote/footnote.md
@@ -0,0 +1 @@
+^[inline]
diff --git a/tests/misc/embedded_language_formatting/in-html/__snapshots__/jsfmt.spec.js.snap b/tests/misc/embedded_language_formatting/in-html/__snapshots__/jsfmt.spec.js.snap
index b10014a63..9c2ce1397 100644
--- a/tests/misc/embedded_language_formatting/in-html/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/misc/embedded_language_formatting/in-html/__snapshots__/jsfmt.spec.js.snap
@@ -1,5 +1,121 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`front-matter-toml.html - {"embeddedLanguageFormatting":"off"} format 1`] = `
+====================================options=====================================
+embeddedLanguageFormatting: "off"
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
++++
+  
+title: Hello
+slug: home
+
++++
+
+<h1>
+  Hello world!</h1>
+
+=====================================output=====================================
++++
+  
+title: Hello
+slug: home
+
++++
+
+<h1>Hello world!</h1>
+
+================================================================================
+`;
+
+exports[`front-matter-toml.html format 1`] = `
+====================================options=====================================
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
++++
+  
+title: Hello
+slug: home
+
++++
+
+<h1>
+  Hello world!</h1>
+
+=====================================output=====================================
++++
+  
+title: Hello
+slug: home
+
++++
+
+<h1>Hello world!</h1>
+
+================================================================================
+`;
+
+exports[`front-matter-yaml.html - {"embeddedLanguageFormatting":"off"} format 1`] = `
+====================================options=====================================
+embeddedLanguageFormatting: "off"
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+---yaml
+  
+title: Hello
+slug: home
+
+---
+
+<h1>
+  Hello world!</h1>
+
+=====================================output=====================================
+---yaml
+  
+title: Hello
+slug: home
+
+---
+
+<h1>Hello world!</h1>
+
+================================================================================
+`;
+
+exports[`front-matter-yaml.html format 1`] = `
+====================================options=====================================
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+---yaml
+  
+title: Hello
+slug: home
+
+---
+
+<h1>
+  Hello world!</h1>
+
+=====================================output=====================================
+---
+title: Hello
+slug: home
+---
+
+<h1>Hello world!</h1>
+
+================================================================================
+`;
+
 exports[`test.html - {"embeddedLanguageFormatting":"off"} format 1`] = `
 ====================================options=====================================
 embeddedLanguageFormatting: "off"
diff --git a/tests/misc/embedded_language_formatting/in-html/front-matter-toml.html b/tests/misc/embedded_language_formatting/in-html/front-matter-toml.html
new file mode 100644
index 000000000..d0dfe44bb
--- /dev/null
+++ b/tests/misc/embedded_language_formatting/in-html/front-matter-toml.html
@@ -0,0 +1,9 @@
++++
+  
+title: Hello
+slug: home
+
++++
+
+<h1>
+  Hello world!</h1>
diff --git a/tests/misc/embedded_language_formatting/in-html/front-matter-yaml.html b/tests/misc/embedded_language_formatting/in-html/front-matter-yaml.html
new file mode 100644
index 000000000..0698ae247
--- /dev/null
+++ b/tests/misc/embedded_language_formatting/in-html/front-matter-yaml.html
@@ -0,0 +1,9 @@
+---yaml
+  
+title: Hello
+slug: home
+
+---
+
+<h1>
+  Hello world!</h1>
diff --git a/tests/misc/errors/handlebars/__snapshots__/jsfmt.spec.js.snap b/tests/misc/errors/handlebars/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..5b21fc6e6
--- /dev/null
+++ b/tests/misc/errors/handlebars/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`invalid.hbs error test 1`] = `
+"Parse error on line 2:
+<A >x, {{@name}
+--------------^
+Expecting 'CLOSE_RAW_BLOCK', 'CLOSE', 'CLOSE_UNESCAPED', 'OPEN_SEXPR', 'CLOSE_SEXPR', 'ID', 'OPEN_BLOCK_PARAMS', 'STRING', 'NUMBER', 'BOOLEAN', 'UNDEFINED', 'NULL', 'DATA', 'SEP', got 'INVALID' (2:0)
+  1 | <A >
+> 2 | x, {{@name}
+  3 | "
+`;
diff --git a/tests/misc/errors/handlebars/invalid.hbs b/tests/misc/errors/handlebars/invalid.hbs
new file mode 100644
index 000000000..76674d8e2
--- /dev/null
+++ b/tests/misc/errors/handlebars/invalid.hbs
@@ -0,0 +1,2 @@
+<A >
+x, {{@name}
diff --git a/tests/misc/errors/handlebars/jsfmt.spec.js b/tests/misc/errors/handlebars/jsfmt.spec.js
new file mode 100644
index 000000000..da9b88409
--- /dev/null
+++ b/tests/misc/errors/handlebars/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, ["glimmer"]);
diff --git a/tests/misc/errors/less/__snapshots__/jsfmt.spec.js.snap b/tests/misc/errors/less/__snapshots__/jsfmt.spec.js.snap
index 73f60c218..e113e898d 100644
--- a/tests/misc/errors/less/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/misc/errors/less/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`inline-comment.js error test 1`] = `
+exports[`inline-comment.less error test 1`] = `
 "(postcss) CssSyntaxError Unknown word (5:4)
   3 | a{
   4 | 	prop
@@ -10,3 +10,21 @@ exports[`inline-comment.js error test 1`] = `
   7 | value;
   8 | }"
 `;
+
+exports[`open-double-quote.less error test 1`] = `
+"(postcss) CssSyntaxError Unclosed string (2:17)
+  1 | a {
+> 2 | background: url(\\"
+    |                 ^
+  3 | }
+  4 | "
+`;
+
+exports[`open-sigle-quote.less error test 1`] = `
+"(postcss) CssSyntaxError Unclosed string (2:17)
+  1 | a {
+> 2 | background: url('
+    |                 ^
+  3 | }
+  4 | "
+`;
diff --git a/tests/misc/errors/less/inline-comment.js b/tests/misc/errors/less/inline-comment.less
similarity index 100%
rename from tests/misc/errors/less/inline-comment.js
rename to tests/misc/errors/less/inline-comment.less
diff --git a/tests/misc/errors/less/open-double-quote.less b/tests/misc/errors/less/open-double-quote.less
new file mode 100644
index 000000000..b71d3cdac
--- /dev/null
+++ b/tests/misc/errors/less/open-double-quote.less
@@ -0,0 +1,3 @@
+a {
+background: url("
+}
diff --git a/tests/misc/errors/less/open-sigle-quote.less b/tests/misc/errors/less/open-sigle-quote.less
new file mode 100644
index 000000000..a4a4e3c33
--- /dev/null
+++ b/tests/misc/errors/less/open-sigle-quote.less
@@ -0,0 +1,3 @@
+a {
+background: url('
+}
diff --git a/tests/vue/v-for/__snapshots__/jsfmt.spec.js.snap b/tests/vue/v-for/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..41fbb87e9
--- /dev/null
+++ b/tests/vue/v-for/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,21 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`invalid.vue format 1`] = `
+====================================options=====================================
+parsers: ["vue"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<template>
+<div
+  v-for="  item instanceof  items "
+></div>
+</template>
+
+=====================================output=====================================
+<template>
+  <div v-for="  item instanceof  items "></div>
+</template>
+
+================================================================================
+`;
diff --git a/tests/vue/v-for/invalid.vue b/tests/vue/v-for/invalid.vue
new file mode 100644
index 000000000..ff40322d9
--- /dev/null
+++ b/tests/vue/v-for/invalid.vue
@@ -0,0 +1,5 @@
+<template>
+<div
+  v-for="  item instanceof  items "
+></div>
+</template>
diff --git a/tests/vue/v-for/jsfmt.spec.js b/tests/vue/v-for/jsfmt.spec.js
new file mode 100644
index 000000000..2fd7eede9
--- /dev/null
+++ b/tests/vue/v-for/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, ["vue"]);
diff --git a/tests/vue/vue/__snapshots__/jsfmt.spec.js.snap b/tests/vue/vue/__snapshots__/jsfmt.spec.js.snap
index 0df004d69..c75364851 100644
--- a/tests/vue/vue/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/vue/vue/__snapshots__/jsfmt.spec.js.snap
@@ -41,6 +41,10 @@ semi: false
   "
   @click="doSomething()"
   @click="doSomething;"
+  @click="a.b;"
+  @click="a[1];"
+  @click="a['b'];"
+  @click="a[null];"
   #default="{foo:{bar:{baz}}}"
 ></div>
 </template>
@@ -104,6 +108,10 @@ semi: false
     "
     @click="doSomething()"
     @click="doSomething;"
+    @click="a.b;"
+    @click="a[1];"
+    @click="a['b'];"
+    @click="a[null]"
     #default="{ foo: { bar: { baz } } }"
   ></div>
 </template>
@@ -152,6 +160,10 @@ trailingComma: "none"
   "
   @click="doSomething()"
   @click="doSomething;"
+  @click="a.b;"
+  @click="a[1];"
+  @click="a['b'];"
+  @click="a[null];"
   #default="{foo:{bar:{baz}}}"
 ></div>
 </template>
@@ -215,6 +227,10 @@ trailingComma: "none"
     "
     @click="doSomething()"
     @click="doSomething;"
+    @click="a.b;"
+    @click="a[1];"
+    @click="a['b'];"
+    @click="a[null]"
     #default="{ foo: { bar: { baz } } }"
   ></div>
 </template>
@@ -262,6 +278,10 @@ printWidth: 80
   "
   @click="doSomething()"
   @click="doSomething;"
+  @click="a.b;"
+  @click="a[1];"
+  @click="a['b'];"
+  @click="a[null];"
   #default="{foo:{bar:{baz}}}"
 ></div>
 </template>
@@ -325,6 +345,10 @@ printWidth: 80
     "
     @click="doSomething()"
     @click="doSomething;"
+    @click="a.b;"
+    @click="a[1];"
+    @click="a['b'];"
+    @click="a[null]"
     #default="{ foo: { bar: { baz } } }"
   ></div>
 </template>
diff --git a/tests/vue/vue/attributes.vue b/tests/vue/vue/attributes.vue
index 0d2e42fc3..fe1585cf4 100644
--- a/tests/vue/vue/attributes.vue
+++ b/tests/vue/vue/attributes.vue
@@ -32,6 +32,10 @@
   "
   @click="doSomething()"
   @click="doSomething;"
+  @click="a.b;"
+  @click="a[1];"
+  @click="a['b'];"
+  @click="a[null];"
   #default="{foo:{bar:{baz}}}"
 ></div>
 </template>
diff --git a/tests_integration/__tests__/__snapshots__/config-invalid.js.snap b/tests_integration/__tests__/__snapshots__/config-invalid.js.snap
index f6713ed29..89b2714f1 100644
--- a/tests_integration/__tests__/__snapshots__/config-invalid.js.snap
+++ b/tests_integration/__tests__/__snapshots__/config-invalid.js.snap
@@ -38,8 +38,12 @@ exports[`throw error for unsupported extension (write) 1`] = `Array []`;
 
 exports[`throw error with invalid config format (stdout) 1`] = `""`;
 
+exports[`throw error with invalid config format (stdout) 2`] = `""`;
+
 exports[`throw error with invalid config format (write) 1`] = `Array []`;
 
+exports[`throw error with invalid config format (write) 2`] = `Array []`;
+
 exports[`throw error with invalid config option (int) (stderr) 1`] = `
 "[error] Invalid tabWidth value. Expected an integer, but received 0.5.
 "
diff --git a/tests_integration/__tests__/__snapshots__/debug-api.js.snap b/tests_integration/__tests__/__snapshots__/debug-api.js.snap
new file mode 100644
index 000000000..455167804
--- /dev/null
+++ b/tests_integration/__tests__/__snapshots__/debug-api.js.snap
@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`API prettier.formatDoc 1`] = `
+"[
+  group([
+    \\"const\\",
+    \\" \\",
+    group([\\"foo\\", \\" =\\", group(indent([line, '\\"bar\\"']))]),
+    indent([]),
+    \\";\\",
+  ]),
+  hardline,
+  breakParent,
+];
+"
+`;
diff --git a/tests_integration/__tests__/__snapshots__/file-info.js.snap b/tests_integration/__tests__/__snapshots__/file-info.js.snap
index 8250b405a..7a3c7901c 100644
--- a/tests_integration/__tests__/__snapshots__/file-info.js.snap
+++ b/tests_integration/__tests__/__snapshots__/file-info.js.snap
@@ -135,3 +135,13 @@ exports[`file-info should try resolve config (stdout) 1`] = `
 `;
 
 exports[`file-info should try resolve config (write) 1`] = `Array []`;
+
+exports[`non-exists ignore path (stderr) 1`] = `""`;
+
+exports[`non-exists ignore path (stdout) 1`] = `
+"{ \\"ignored\\": false, \\"inferredParser\\": \\"babel\\" }
+
+"
+`;
+
+exports[`non-exists ignore path (write) 1`] = `Array []`;
diff --git a/tests_integration/__tests__/__snapshots__/stdin-filepath.js.snap b/tests_integration/__tests__/__snapshots__/stdin-filepath.js.snap
index 2f065a2b1..f27f5e90f 100644
--- a/tests_integration/__tests__/__snapshots__/stdin-filepath.js.snap
+++ b/tests_integration/__tests__/__snapshots__/stdin-filepath.js.snap
@@ -1,5 +1,27 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`apply editorconfig for stdin-filepath with a deep path (stderr) 1`] = `""`;
+
+exports[`apply editorconfig for stdin-filepath with a deep path (stderr) 2`] = `""`;
+
+exports[`apply editorconfig for stdin-filepath with a deep path (stdout) 1`] = `
+"function f() {
+	console.log(\\"should be indented with a tab\\")
+}
+"
+`;
+
+exports[`apply editorconfig for stdin-filepath with a deep path (stdout) 2`] = `
+"function f() {
+	console.log(\\"should be indented with a tab\\")
+}
+"
+`;
+
+exports[`apply editorconfig for stdin-filepath with a deep path (write) 1`] = `Array []`;
+
+exports[`apply editorconfig for stdin-filepath with a deep path (write) 2`] = `Array []`;
+
 exports[`apply editorconfig for stdin-filepath with nonexistent directory (stderr) 1`] = `""`;
 
 exports[`apply editorconfig for stdin-filepath with nonexistent directory (stdout) 1`] = `
diff --git a/tests_integration/__tests__/config-invalid.js b/tests_integration/__tests__/config-invalid.js
index f5054b8fb..c94fbe96e 100644
--- a/tests_integration/__tests__/config-invalid.js
+++ b/tests_integration/__tests__/config-invalid.js
@@ -22,6 +22,18 @@ describe("throw error with invalid config format", () => {
   });
 });
 
+describe("throw error with invalid config format", () => {
+  runPrettier("cli/config/invalid", [
+    "--config",
+    "type-error/.prettierrc",
+  ]).test({
+    status: "non-zero",
+    stderr: expect.stringMatching(
+      "Config is only allowed to be an object, but received number in"
+    ),
+  });
+});
+
 describe("throw error with invalid config target (directory)", () => {
   runPrettier("cli/config/invalid", [
     "--config",
diff --git a/tests_integration/__tests__/config-resolution.js b/tests_integration/__tests__/config-resolution.js
index bea830899..64f5761e4 100644
--- a/tests_integration/__tests__/config-resolution.js
+++ b/tests_integration/__tests__/config-resolution.js
@@ -249,6 +249,35 @@ test("API resolveConfig.sync overrides work with absolute paths", () => {
   });
 });
 
+test("API resolveConfig.sync overrides excludeFiles", () => {
+  const notOverride = path.join(
+    __dirname,
+    "../cli/config/overrides-exclude-files/foo"
+  );
+  expect(prettier.resolveConfig.sync(notOverride)).toMatchObject({
+    singleQuote: true,
+    trailingComma: "all",
+  });
+
+  const singleQuote = path.join(
+    __dirname,
+    "../cli/config/overrides-exclude-files/single-quote.js"
+  );
+  expect(prettier.resolveConfig.sync(singleQuote)).toMatchObject({
+    singleQuote: true,
+    trailingComma: "es5",
+  });
+
+  const doubleQuote = path.join(
+    __dirname,
+    "../cli/config/overrides-exclude-files/double-quote.js"
+  );
+  expect(prettier.resolveConfig.sync(doubleQuote)).toMatchObject({
+    singleQuote: false,
+    trailingComma: "es5",
+  });
+});
+
 test("API resolveConfig removes $schema option", () => {
   const file = path.resolve(
     path.join(__dirname, "../cli/config/$schema/index.js")
diff --git a/tests_integration/__tests__/debug-api.js b/tests_integration/__tests__/debug-api.js
new file mode 100644
index 000000000..39858ef54
--- /dev/null
+++ b/tests_integration/__tests__/debug-api.js
@@ -0,0 +1,44 @@
+"use strict";
+
+const {
+  parse,
+  formatAST,
+  formatDoc,
+  printToDoc,
+  printDocToString,
+} = require("prettier/local").__debug;
+const { outdent } = require("outdent");
+
+const code = outdent`
+  const foo =              'bar'
+`;
+const formatted = 'const foo = "bar";\n';
+const options = { parser: "babel", originalText: code };
+
+describe("API", () => {
+  const { ast } = parse(code, options);
+  test("prettier.parse", () => {
+    expect(Array.isArray(ast.program.body)).toBe(true);
+  });
+
+  const { formatted: formatResultFromAST } = formatAST(ast, options);
+  test("prettier.formatAST", () => {
+    expect(formatResultFromAST).toBe(formatted);
+  });
+
+  const doc = printToDoc(code, options);
+  test("prettier.printToDoc", () => {
+    expect(doc.type).toBe("concat");
+    expect(Array.isArray(doc.parts)).toBe(true);
+  });
+
+  const formatResultFromDoc = formatDoc(doc, options);
+  test("prettier.formatDoc", () => {
+    expect(formatResultFromDoc).toMatchSnapshot();
+  });
+
+  const { formatted: stringFromDoc } = printDocToString(doc, options);
+  test("prettier.printDocToString", () => {
+    expect(stringFromDoc).toBe(formatted);
+  });
+});
diff --git a/tests_integration/__tests__/file-info.js b/tests_integration/__tests__/file-info.js
index 96e80a319..c7790167c 100644
--- a/tests_integration/__tests__/file-info.js
+++ b/tests_integration/__tests__/file-info.js
@@ -62,6 +62,16 @@ describe("extracts file-info with ignored=true for a file in a hand-picked .pret
   });
 });
 
+describe("non-exists ignore path", () => {
+  runPrettier("cli/", [
+    "--file-info",
+    "regular-module.js",
+    "--ignore-path=ignore-path/non-exists/.prettierignore",
+  ]).test({
+    status: 0,
+  });
+});
+
 describe("extracts file-info for a file in not_node_modules", () => {
   runPrettier("cli/with-node-modules/", [
     "--file-info",
diff --git a/tests_integration/__tests__/invalid-ignore.js b/tests_integration/__tests__/invalid-ignore.js
index 3900dc62f..12784a1c8 100644
--- a/tests_integration/__tests__/invalid-ignore.js
+++ b/tests_integration/__tests__/invalid-ignore.js
@@ -1,5 +1,7 @@
 "use strict";
 
+const path = require("path");
+const prettier = require("prettier/local");
 const runPrettier = require("../runPrettier");
 
 expect.addSnapshotSerializer(require("../path-serializer"));
@@ -8,4 +10,15 @@ describe("throw error with invalid ignore", () => {
   runPrettier("cli/invalid-ignore", ["something.js"]).test({
     status: "non-zero",
   });
+
+  test("sync api", async () => {
+    await expect(
+      prettier.getFileInfo("something.js", {
+        ignorePath: path.join(
+          __dirname,
+          "../cli/invalid-ignore/.prettierignore"
+        ),
+      })
+    ).rejects.toThrow(/EISDIR: illegal operation on a directory/);
+  });
 });
diff --git a/tests_integration/__tests__/plugin-options-string.js b/tests_integration/__tests__/plugin-options-string.js
index 1c7f07f21..96e3008fa 100644
--- a/tests_integration/__tests__/plugin-options-string.js
+++ b/tests_integration/__tests__/plugin-options-string.js
@@ -54,3 +54,18 @@ describe("external options from config file should work", () => {
     write: [],
   });
 });
+
+describe("Non exists plugin", () => {
+  runPrettier(
+    "plugins/options-string",
+    ["--plugin=--invalid--", "--stdin-filepath", "example.foo"],
+    { input: "hello-world" }
+  ).test({
+    stdout: "",
+    stderr: expect.stringMatching(
+      /Cannot (?:resolve|find) module '--invalid--' from/
+    ),
+    status: 1,
+    write: [],
+  });
+});
diff --git a/tests_integration/__tests__/resolve-config-file.js b/tests_integration/__tests__/resolve-config-file.js
new file mode 100644
index 000000000..44e191a62
--- /dev/null
+++ b/tests_integration/__tests__/resolve-config-file.js
@@ -0,0 +1,15 @@
+"use strict";
+
+const path = require("path");
+
+const prettier = require("prettier/local");
+
+test("API resolveConfigFile", async () => {
+  const result = await prettier.resolveConfigFile();
+  expect(result).toEqual(path.join(__dirname, "../../.prettierrc"));
+});
+
+test("API resolveConfigFile.sync", () => {
+  const result = prettier.resolveConfigFile.sync();
+  expect(result).toEqual(path.join(__dirname, "../../.prettierrc"));
+});
diff --git a/tests_integration/__tests__/stdin-filepath.js b/tests_integration/__tests__/stdin-filepath.js
index 863151be3..32cb97e23 100644
--- a/tests_integration/__tests__/stdin-filepath.js
+++ b/tests_integration/__tests__/stdin-filepath.js
@@ -1,5 +1,6 @@
 "use strict";
 
+const { isCI } = require("ci-info");
 const runPrettier = require("../runPrettier");
 
 describe("format correctly if stdin content compatible with stdin-filepath", () => {
@@ -64,6 +65,56 @@ function f() {
   });
 });
 
+describe("apply editorconfig for stdin-filepath with a deep path", () => {
+  runPrettier(
+    "cli",
+    ["--stdin-filepath", "config/editorconfig/" + "a/".repeat(30) + "three.js"],
+    {
+      input: `
+function f() {
+  console.log("should be indented with a tab");
+}
+`.trim(), // js
+    }
+  ).test({
+    status: 0,
+  });
+});
+
+if (isCI) {
+  describe("apply editorconfig for stdin-filepath in root", () => {
+    const code = `
+function f() {
+  console.log("should be indented with a tab");
+}
+`.trim();
+    runPrettier("cli", ["--stdin-filepath", "/foo.js"], {
+      input: code, // js
+    }).test({
+      status: 0,
+      stdout: code + "\n",
+      stderr: "",
+      write: [],
+    });
+  });
+}
+
+describe("apply editorconfig for stdin-filepath with a deep path", () => {
+  runPrettier(
+    "cli",
+    ["--stdin-filepath", "config/editorconfig/" + "a/".repeat(30) + "three.js"],
+    {
+      input: `
+function f() {
+  console.log("should be indented with a tab");
+}
+`.trim(), // js
+    }
+  ).test({
+    status: 0,
+  });
+});
+
 describe("don’t apply editorconfig outside project for stdin-filepath with nonexistent directory", () => {
   runPrettier(
     "cli",
diff --git a/tests_integration/__tests__/third-party.js b/tests_integration/__tests__/third-party.js
index aef027002..8dcb6079a 100644
--- a/tests_integration/__tests__/third-party.js
+++ b/tests_integration/__tests__/third-party.js
@@ -2,7 +2,7 @@
 
 const path = require("path");
 const { thirdParty } = require("../env");
-const { cosmiconfig, cosmiconfigSync } = require(thirdParty);
+const { cosmiconfig, cosmiconfigSync, isCI } = require(thirdParty);
 
 expect.addSnapshotSerializer(require("../path-serializer"));
 
@@ -62,3 +62,7 @@ describe("cosmiconfig", () => {
     }).toThrowErrorMatchingSnapshot();
   });
 });
+
+test("isCI", () => {
+  expect(typeof isCI()).toEqual("boolean");
+});
diff --git a/tests_integration/cli/config/invalid/type-error/.prettierrc b/tests_integration/cli/config/invalid/type-error/.prettierrc
new file mode 100644
index 000000000..d00491fd7
--- /dev/null
+++ b/tests_integration/cli/config/invalid/type-error/.prettierrc
@@ -0,0 +1 @@
+1
diff --git a/tests_integration/cli/config/overrides-exclude-files/.prettierrc b/tests_integration/cli/config/overrides-exclude-files/.prettierrc
new file mode 100644
index 000000000..ca91ae40b
--- /dev/null
+++ b/tests_integration/cli/config/overrides-exclude-files/.prettierrc
@@ -0,0 +1,19 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "overrides": [
+    {
+      "files": ["*.js"],
+      "options": {
+        "trailingComma": "es5"
+      }
+    },
+    {
+      "files": ["*.js"],
+      "excludeFiles": ["single-quote.js"],
+      "options": {
+        "singleQuote": false
+      }
+    }
+  ]
+}