Test empty files with snippets (#8116)

* Test empty files with `snippets`
* Assert output

tests/empty/__snapshots__/jsfmt.spec.js.snap

@@ -1,52 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`empty format 1`] = `
-====================================options=====================================
-parsers: ["flow", "babel", "babel-flow", "babel-ts", "typescript", "css", "less", "scss", "json", "json5", "json-stringify", "graphql", "markdown", "mdx", "vue", "yaml", "html", "angular", "lwc"]
-printWidth: 80
-                                                                                | printWidth
-=====================================input======================================
-
-=====================================output=====================================
-
-================================================================================
-`;
-
-exports[`newline format 1`] = `
-====================================options=====================================
-parsers: ["flow", "babel", "babel-flow", "babel-ts", "typescript", "css", "less", "scss", "json", "json5", "json-stringify", "graphql", "markdown", "mdx", "vue", "yaml", "html", "angular", "lwc"]
-printWidth: 80
-                                                                                | printWidth
-=====================================input======================================
-
-
-=====================================output=====================================
-
-================================================================================
-`;
-
-exports[`space format 1`] = `
-====================================options=====================================
-parsers: ["flow", "babel", "babel-flow", "babel-ts", "typescript", "css", "less", "scss", "json", "json5", "json-stringify", "graphql", "markdown", "mdx", "vue", "yaml", "html", "angular", "lwc"]
-printWidth: 80
-                                                                                | printWidth
-=====================================input======================================
- 
-
-=====================================output=====================================
-
-================================================================================
-`;
-
-exports[`space-newline format 1`] = `
-====================================options=====================================
-parsers: ["flow", "babel", "babel-flow", "babel-ts", "typescript", "css", "less", "scss", "json", "json5", "json-stringify", "graphql", "markdown", "mdx", "vue", "yaml", "html", "angular", "lwc"]
-printWidth: 80
-                                                                                | printWidth
-=====================================input======================================
- 
-
-=====================================output=====================================
-
-================================================================================
-`;

tests/empty/jsfmt.spec.js

@@ -1,11 +1,42 @@
-const prettier = require("prettier/local");
-const parsers = prettier
+const parsers = require("prettier/local")
   .getSupportInfo()
-  .options.find((option) => option.name === "parser");
+  .options.find((option) => option.name === "parser")
+  .choices.filter((choice) => !choice.deprecated)
+  .map((choice) => choice.value);
 
 run_spec(
-  __dirname,
-  parsers.choices
-    .filter((choice) => !choice.deprecated)
-    .map((choice) => choice.value)
+  {
+    dirname: __dirname,
+    snippets: [
+      // empty
+      "",
+      // space
+      " ",
+      "     ",
+      // `\n`
+      "\n",
+      " \n",
+      " \n ",
+      "\n\n\n\n",
+      " \n  \n \n\n",
+      " \n  \n \n\n ",
+      // `\r`
+      "\r",
+      " \r",
+      " \r ",
+      "\r\r\r\r",
+      " \r  \r \r\r",
+      " \r  \r \r\r ",
+      // `\r\n`
+      "\r\n",
+      " \r\n",
+      " \r\n ",
+      "\r\n\r\n\r\n\r\n",
+      " \r\n  \r\n \r\n\r\n",
+      " \r\n  \r\n \r\n\r\n ",
+      // mixed `\r` `\r\n` '\n'
+      " \r \r\n \n ",
+    ].map((code) => ({ code, output: "" })),
+  },
+  parsers
 );

tests/empty/newline

@@ -1 +0,0 @@
-

tests/empty/space

@@ -1 +0,0 @@
- 

tests/empty/space-newline

@@ -1 +0,0 @@
-