diff --git a/.eslintignore b/.eslintignore
index 46ef00d6a..6e9adefbb 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -6,3 +6,4 @@
 /dist/
 **/node_modules/**
 /website/static/lib/
+/tests_integration/cli/
diff --git a/src/cli-util.js b/src/cli-util.js
index dff83a1b3..a73b94389 100644
--- a/src/cli-util.js
+++ b/src/cli-util.js
@@ -256,8 +256,8 @@ function eachFilename(argv, patterns, callback) {
     patterns = patterns.concat(["!**/node_modules/**", "!./node_modules/**"]);
   }
 
-  const filePaths = globby.sync(patterns, { dot: true });
   try {
+    const filePaths = globby.sync(patterns, { dot: true });
     if (filePaths.length === 0) {
       console.error(`No matching files. Patterns tried: ${patterns.join(" ")}`);
       process.exitCode = 2;
diff --git a/tests_integration/__tests__/__snapshots__/arg-parsing.js.snap b/tests_integration/__tests__/__snapshots__/arg-parsing.js.snap
index 0d546b34c..88c70b7e4 100644
--- a/tests_integration/__tests__/__snapshots__/arg-parsing.js.snap
+++ b/tests_integration/__tests__/__snapshots__/arg-parsing.js.snap
@@ -1,27 +1,21 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`boolean flags do not swallow the next argument 1`] = `
-"/* eslint-disable */
-
-console.log('could be single quote and without semi');
+"console.log('could be single quote and without semi');
 "
 `;
 
 exports[`boolean flags do not swallow the next argument 2`] = `""`;
 
 exports[`negated options work 1`] = `
-"/* eslint-disable */
-
-console.log(\\"could be single quote and without semi\\")
+"console.log(\\"could be single quote and without semi\\")
 "
 `;
 
 exports[`negated options work 2`] = `""`;
 
 exports[`unknown negated options are warned 1`] = `
-"/* eslint-disable */
-
-console.log(\\"could be single quote and without semi\\");
+"console.log(\\"could be single quote and without semi\\");
 "
 `;
 
@@ -32,9 +26,7 @@ exports[`unknown negated options are warned 2`] = `
 `;
 
 exports[`unknown options are warned 1`] = `
-"/* eslint-disable */
-
-console.log(\\"could be single quote and without semi\\");
+"console.log(\\"could be single quote and without semi\\");
 "
 `;
 
diff --git a/tests_integration/__tests__/__snapshots__/config-invalid.js.snap b/tests_integration/__tests__/__snapshots__/config-invalid.js.snap
new file mode 100644
index 000000000..aae7981bf
--- /dev/null
+++ b/tests_integration/__tests__/__snapshots__/config-invalid.js.snap
@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`throw error with invalid config format 1`] = `"Failed to parse \\"<cwd>/tests_integration/cli/config/invalid/file/.prettierrc\\" as JSON, JS, or YAML."`;
+
+exports[`throw error with invalid config option (int) 1`] = `
+"Invalid --tab-width value. Expected an integer, but received: 0.5
+"
+`;
+
+exports[`throw error with invalid config option (trailingComma) 1`] = `
+"Invalid configuration:
+"
+`;
+
+exports[`throw error with invalid config target (directory) 1`] = `"EISDIR: illegal operation on a directory, read"`;
diff --git a/tests_integration/__tests__/__snapshots__/config-resolution.js.snap b/tests_integration/__tests__/__snapshots__/config-resolution.js.snap
index 57d5acb37..da0b82de5 100644
--- a/tests_integration/__tests__/__snapshots__/config-resolution.js.snap
+++ b/tests_integration/__tests__/__snapshots__/config-resolution.js.snap
@@ -1,20 +1,15 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`CLI overrides take precedence 1`] = `
-"/* eslint-disable */
-console.log(
+"console.log(
   \\"should have semi\\"
 );
-/* eslint-disable */
 console.log(
   \\"should not have semi\\"
 )
-/* eslint-disable */
 console.log(
   \\"should have semi\\"
 );
-/* eslint-disable */
-
 function f() {
         console.log(
                 \\"should have tab width 8\\"
@@ -25,22 +20,16 @@ function f() {
 module.exports = {
         tabWidth: 8
 };
-/* eslint-disable */
-
 function f() {
   console.log(
     \\"should have no semicolons\\"
   )
 }
-/* eslint-disable */
-
 function f() {
    console.log(
       \\"should have tab width 3\\"
    );
 }
-/* eslint-disable */
-
 function f() {
   console.log.apply(
     null,
@@ -55,9 +44,7 @@ function f() {
 `;
 
 exports[`accepts configuration from --config 1`] = `
-"/* eslint-disable */
-
-function f() {
+"function f() {
   console.log(\\"should have tab width 8\\")
 }
 "
@@ -69,14 +56,9 @@ exports[`resolves configuration file with --find-config-path file 1`] = `
 `;
 
 exports[`resolves configuration from external files 1`] = `
-"/* eslint-disable */
-console.log(\\"should have semi\\");
-/* eslint-disable */
+"console.log(\\"should have semi\\");
 console.log(\\"should not have semi\\")
-/* eslint-disable */
 console.log(\\"should have semi\\");
-/* eslint-disable */
-
 function f() {
         console.log(\\"should have tab width 8\\");
 }
@@ -85,18 +67,12 @@ function f() {
 module.exports = {
         tabWidth: 8
 };
-/* eslint-disable */
-
 function f() {
   console.log(\\"should have no semicolons\\")
 }
-/* eslint-disable */
-
 function f() {
    console.log(\\"should have tab width 3\\");
 }
-/* eslint-disable */
-
 function f() {
   console.log.apply(null, [
     'this file',
diff --git a/tests_integration/__tests__/__snapshots__/early-exit.js.snap b/tests_integration/__tests__/__snapshots__/early-exit.js.snap
new file mode 100644
index 000000000..32c8d4105
--- /dev/null
+++ b/tests_integration/__tests__/__snapshots__/early-exit.js.snap
@@ -0,0 +1,54 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`show usage with --help 1`] = `
+"Usage: prettier [opts] [filename ...]
+
+Available options:
+  --write                  Edit the file in-place. (Beware!)
+  --list-different or -l   Print filenames of files that are different from Prettier formatting.
+  --config                 Path to a prettier configuration file (.prettierrc, package.json, prettier.config.js).
+  --no-config              Do not look for a configuration file.
+  --find-config-path <path>
+                           Finds and prints the path to a configuration file for a given input file.
+  --ignore-path <path>     Path to a file containing patterns that describe files to ignore.
+                           Defaults to ./.prettierignore.
+  --stdin                  Read input from stdin.
+  --stdin-filepath         Path to the file used to read from stdin.
+  --print-width <int>      Specify the length of line that the printer will wrap on. Defaults to 80.
+  --tab-width <int>        Specify the number of spaces per indentation-level. Defaults to 2.
+  --use-tabs               Indent lines with tabs instead of spaces.
+  --no-semi                Do not print semicolons, except at the beginning of lines which may need them.
+  --single-quote           Use single quotes instead of double quotes.
+  --no-bracket-spacing     Do not print spaces between brackets.
+  --jsx-bracket-same-line  Put > on the last line instead of at a new line.
+  --trailing-comma <none|es5|all>
+                           Print trailing commas wherever possible when multi-line. Defaults to none.
+  --parser <flow|babylon|typescript|postcss|json|graphql>
+                           Specify which parse to use. Defaults to babylon.
+  --cursor-offset <int>    Print (to stderr) where a cursor at the given position would move to after formatting.
+                           This option cannot be used with --range-start and --range-end
+  --range-start <int>      Format code starting at a given character offset.
+                           The range will extend backwards to the start of the first line containing the selected statement.
+                           This option cannot be used with --cursor-offset.
+                           Defaults to 0.
+  --range-end <int>        Format code ending at a given character offset (exclusive).
+                           The range will extend forwards to the end of the selected statement.
+                           This option cannot be used with --cursor-offset.
+                           Defaults to Infinity.
+  --no-color               Do not colorize error messages.
+  --with-node-modules      Process files inside 'node_modules' directory.
+  --version or -v          Print Prettier version.
+
+
+"
+`;
+
+exports[`throw error with --find-config-path + multiple files 1`] = `
+"Cannot use --find-config-path with multiple files
+"
+`;
+
+exports[`throw error with --write + --debug-check 1`] = `
+"Cannot use --write and --debug-check together.
+"
+`;
diff --git a/tests_integration/__tests__/__snapshots__/invalid-ignore.js.snap b/tests_integration/__tests__/__snapshots__/invalid-ignore.js.snap
new file mode 100644
index 000000000..ba39faeba
--- /dev/null
+++ b/tests_integration/__tests__/__snapshots__/invalid-ignore.js.snap
@@ -0,0 +1,6 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`throw error with invalid ignore 1`] = `
+"Unable to read <cwd>/tests_integration/cli/invalid-ignore/.prettierignore:
+"
+`;
diff --git a/tests_integration/__tests__/__snapshots__/write.js.snap b/tests_integration/__tests__/__snapshots__/write.js.snap
new file mode 100644
index 000000000..c4d93e198
--- /dev/null
+++ b/tests_integration/__tests__/__snapshots__/write.js.snap
@@ -0,0 +1,18 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`do not write file with --write + invalid file 1`] = `
+"invalid.js: SyntaxError: Unexpected token, expected ; (1:6)
+> 1 | this is invalid!
+    |      ^
+"
+`;
+
+exports[`write file with --write + unformated file 1`] = `
+Array [
+  Object {
+    "content": "var x = 1;
+",
+    "filename": "unformated.js",
+  },
+]
+`;
diff --git a/tests_integration/__tests__/config-invalid.js b/tests_integration/__tests__/config-invalid.js
new file mode 100644
index 000000000..f2252ab45
--- /dev/null
+++ b/tests_integration/__tests__/config-invalid.js
@@ -0,0 +1,38 @@
+"use strict";
+
+const runPrettier = require("../runPrettier");
+
+expect.addSnapshotSerializer(require("../cwd-serializer"));
+
+test("throw error with invalid config format", () => {
+  const output = runPrettier("cli/config/invalid", [
+    "--config",
+    "file/.prettierrc"
+  ]);
+  expect(output.stderr).toMatchSnapshot();
+  expect(output.status).not.toBe(0);
+});
+
+test("throw error with invalid config target (directory)", () => {
+  const output = runPrettier("cli/config/invalid", [
+    "--config",
+    "folder/.prettierrc" // this is a directory
+  ]);
+  expect(output.stderr).toMatchSnapshot();
+  expect(output.status).not.toBe(0);
+});
+
+test("throw error with invalid config option (int)", () => {
+  const output = runPrettier("cli/config/invalid", ["--config", "option/int"]);
+  expect(output.stderr).toMatchSnapshot();
+  expect(output.status).not.toBe(0);
+});
+
+test("throw error with invalid config option (trailingComma)", () => {
+  const output = runPrettier("cli/config/invalid", [
+    "--config",
+    "option/trailingComma"
+  ]);
+  expect(output.stderr).toMatchSnapshot();
+  expect(output.status).not.toBe(0);
+});
diff --git a/tests_integration/__tests__/early-exit.js b/tests_integration/__tests__/early-exit.js
new file mode 100644
index 000000000..95bdc75b0
--- /dev/null
+++ b/tests_integration/__tests__/early-exit.js
@@ -0,0 +1,32 @@
+"use strict";
+
+const prettier = require("../..");
+const runPrettier = require("../runPrettier");
+
+test("show version with --version", () => {
+  const result = runPrettier("cli/with-shebang", ["--version"]);
+
+  expect(result.stdout).toBe(prettier.version + "\n");
+  expect(result.status).toEqual(0);
+});
+
+test("show usage with --help", () => {
+  const result = runPrettier("cli", ["--help"]);
+
+  expect(result.stdout).toMatchSnapshot();
+  expect(result.status).toEqual(0);
+});
+
+test("throw error with --write + --debug-check", () => {
+  const result = runPrettier("cli", ["--write", "--debug-check"]);
+
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).toEqual(1);
+});
+
+test("throw error with --find-config-path + multiple files", () => {
+  const result = runPrettier("cli", ["--find-config-path", "abc.js", "def.js"]);
+
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).toEqual(1);
+});
diff --git a/tests_integration/__tests__/invalid-ignore.js b/tests_integration/__tests__/invalid-ignore.js
new file mode 100644
index 000000000..255f94805
--- /dev/null
+++ b/tests_integration/__tests__/invalid-ignore.js
@@ -0,0 +1,12 @@
+"use strict";
+
+const runPrettier = require("../runPrettier");
+
+expect.addSnapshotSerializer(require("../cwd-serializer"));
+
+test("throw error with invalid ignore", () => {
+  const result = runPrettier("cli/invalid-ignore", ["something.js"]);
+
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.status).not.toEqual(0);
+});
diff --git a/tests_integration/__tests__/write.js b/tests_integration/__tests__/write.js
new file mode 100644
index 000000000..be9544f72
--- /dev/null
+++ b/tests_integration/__tests__/write.js
@@ -0,0 +1,25 @@
+"use strict";
+
+const runPrettier = require("../runPrettier");
+
+test("write file with --write + unformated file", () => {
+  const result = runPrettier("cli/write", ["--write", "unformated.js"]);
+
+  expect(result.write).toMatchSnapshot();
+  expect(result.status).toEqual(0);
+});
+
+test("do not write file with --write + formated file", () => {
+  const result = runPrettier("cli/write", ["--write", "formated.js"]);
+
+  expect(result.write).toHaveLength(0);
+  expect(result.status).toEqual(0);
+});
+
+test("do not write file with --write + invalid file", () => {
+  const result = runPrettier("cli/write", ["--write", "invalid.js"]);
+
+  expect(result.stderr).toMatchSnapshot();
+  expect(result.write).toHaveLength(0);
+  expect(result.status).not.toEqual(0);
+});
diff --git a/tests_integration/cli/arg-parsing/file.js b/tests_integration/cli/arg-parsing/file.js
index 5a555e494..354349263 100644
--- a/tests_integration/cli/arg-parsing/file.js
+++ b/tests_integration/cli/arg-parsing/file.js
@@ -1,3 +1 @@
-/* eslint-disable */
-
 console.log("could be single quote and without semi")
diff --git a/tests_integration/cli/config/invalid/file/.prettierrc b/tests_integration/cli/config/invalid/file/.prettierrc
new file mode 100644
index 000000000..34224b1fa
--- /dev/null
+++ b/tests_integration/cli/config/invalid/file/.prettierrc
@@ -0,0 +1 @@
+--invalid--
\ No newline at end of file
diff --git a/tests_integration/cli/config/invalid/folder/.prettierrc/placeholder b/tests_integration/cli/config/invalid/folder/.prettierrc/placeholder
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests_integration/cli/config/invalid/option/int b/tests_integration/cli/config/invalid/option/int
new file mode 100644
index 000000000..8169b913c
--- /dev/null
+++ b/tests_integration/cli/config/invalid/option/int
@@ -0,0 +1,3 @@
+{
+    "tabWidth": 0.5
+}
\ No newline at end of file
diff --git a/tests_integration/cli/config/invalid/option/trailingComma b/tests_integration/cli/config/invalid/option/trailingComma
new file mode 100644
index 000000000..8c4f8616d
--- /dev/null
+++ b/tests_integration/cli/config/invalid/option/trailingComma
@@ -0,0 +1,3 @@
+{
+    "trailing-comma": "wow"
+}
\ No newline at end of file
diff --git a/tests_integration/cli/config/jest/Component.js b/tests_integration/cli/config/jest/Component.js
index a06d12cad..190c83a1c 100644
--- a/tests_integration/cli/config/jest/Component.js
+++ b/tests_integration/cli/config/jest/Component.js
@@ -1,2 +1 @@
-/* eslint-disable */
 console.log("should not have semi")
diff --git a/tests_integration/cli/config/jest/Component.test.js b/tests_integration/cli/config/jest/Component.test.js
index 018894b0d..c4a064694 100644
--- a/tests_integration/cli/config/jest/Component.test.js
+++ b/tests_integration/cli/config/jest/Component.test.js
@@ -1,2 +1 @@
-/* eslint-disable */
 console.log("should have semi");
diff --git a/tests_integration/cli/config/jest/__best-tests__/file.js b/tests_integration/cli/config/jest/__best-tests__/file.js
index 018894b0d..c4a064694 100644
--- a/tests_integration/cli/config/jest/__best-tests__/file.js
+++ b/tests_integration/cli/config/jest/__best-tests__/file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 console.log("should have semi");
diff --git a/tests_integration/cli/config/js/file.js b/tests_integration/cli/config/js/file.js
index ded607e0e..2e2b4c359 100644
--- a/tests_integration/cli/config/js/file.js
+++ b/tests_integration/cli/config/js/file.js
@@ -1,5 +1,3 @@
-/* eslint-disable */
-
 function f() {
   console.log("should have tab width 8");
 }
diff --git a/tests_integration/cli/config/no-config/file.js b/tests_integration/cli/config/no-config/file.js
index da197b3c6..e5f18dccc 100644
--- a/tests_integration/cli/config/no-config/file.js
+++ b/tests_integration/cli/config/no-config/file.js
@@ -1,5 +1,3 @@
-/* eslint-disable */
-
 function f() {
   console.log("should have no semicolons");
 }
diff --git a/tests_integration/cli/config/package/file.js b/tests_integration/cli/config/package/file.js
index d0bedd4f8..668d86f50 100644
--- a/tests_integration/cli/config/package/file.js
+++ b/tests_integration/cli/config/package/file.js
@@ -1,5 +1,3 @@
-/* eslint-disable */
-
 function f() {
   console.log("should have tab width 3");
 }
diff --git a/tests_integration/cli/config/rc-json/file.js b/tests_integration/cli/config/rc-json/file.js
index f530b344e..e3340e7e9 100644
--- a/tests_integration/cli/config/rc-json/file.js
+++ b/tests_integration/cli/config/rc-json/file.js
@@ -1,5 +1,3 @@
-/* eslint-disable */
-
 function f() {
   console.log.apply(null, [
     "this file",
diff --git a/tests_integration/cli/ignore-path/other-regular-modules.js b/tests_integration/cli/ignore-path/other-regular-modules.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/ignore-path/other-regular-modules.js
+++ b/tests_integration/cli/ignore-path/other-regular-modules.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/ignore-path/regular-module.js b/tests_integration/cli/ignore-path/regular-module.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/ignore-path/regular-module.js
+++ b/tests_integration/cli/ignore-path/regular-module.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/invalid-ignore/.prettierignore/placeholder b/tests_integration/cli/invalid-ignore/.prettierignore/placeholder
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests_integration/cli/invalid-ignore/something.js b/tests_integration/cli/invalid-ignore/something.js
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests_integration/cli/multiple-patterns/directory/file.js b/tests_integration/cli/multiple-patterns/directory/file.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/directory/file.js
+++ b/tests_integration/cli/multiple-patterns/directory/file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/multiple-patterns/directory/nested-directory/nested-directory-file.js b/tests_integration/cli/multiple-patterns/directory/nested-directory/nested-directory-file.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/directory/nested-directory/nested-directory-file.js
+++ b/tests_integration/cli/multiple-patterns/directory/nested-directory/nested-directory-file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/multiple-patterns/other-directory/file.js b/tests_integration/cli/multiple-patterns/other-directory/file.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/other-directory/file.js
+++ b/tests_integration/cli/multiple-patterns/other-directory/file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/multiple-patterns/other-directory/nested-directory/nested-directory-file.js b/tests_integration/cli/multiple-patterns/other-directory/nested-directory/nested-directory-file.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/other-directory/nested-directory/nested-directory-file.js
+++ b/tests_integration/cli/multiple-patterns/other-directory/nested-directory/nested-directory-file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/multiple-patterns/other-regular-modules.js b/tests_integration/cli/multiple-patterns/other-regular-modules.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/other-regular-modules.js
+++ b/tests_integration/cli/multiple-patterns/other-regular-modules.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/multiple-patterns/regular-module.js b/tests_integration/cli/multiple-patterns/regular-module.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/multiple-patterns/regular-module.js
+++ b/tests_integration/cli/multiple-patterns/regular-module.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/with-node-modules/not_node_modules/file.js b/tests_integration/cli/with-node-modules/not_node_modules/file.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/with-node-modules/not_node_modules/file.js
+++ b/tests_integration/cli/with-node-modules/not_node_modules/file.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/with-node-modules/regular-module.js b/tests_integration/cli/with-node-modules/regular-module.js
index 3d0ca1bd1..ad9a93a7c 100644
--- a/tests_integration/cli/with-node-modules/regular-module.js
+++ b/tests_integration/cli/with-node-modules/regular-module.js
@@ -1,2 +1 @@
-/* eslint-disable */
 'use strict';
diff --git a/tests_integration/cli/write/formated.js b/tests_integration/cli/write/formated.js
new file mode 100644
index 000000000..b506100a9
--- /dev/null
+++ b/tests_integration/cli/write/formated.js
@@ -0,0 +1 @@
+var x = 1;
diff --git a/tests_integration/cli/write/invalid.js b/tests_integration/cli/write/invalid.js
new file mode 100644
index 000000000..67376e5de
--- /dev/null
+++ b/tests_integration/cli/write/invalid.js
@@ -0,0 +1 @@
+this is invalid!
\ No newline at end of file
diff --git a/tests_integration/cli/write/unformated.js b/tests_integration/cli/write/unformated.js
new file mode 100644
index 000000000..646611c06
--- /dev/null
+++ b/tests_integration/cli/write/unformated.js
@@ -0,0 +1 @@
+var x      =      1;
\ No newline at end of file
diff --git a/tests_integration/cwd-serializer.js b/tests_integration/cwd-serializer.js
new file mode 100644
index 000000000..88027d12e
--- /dev/null
+++ b/tests_integration/cwd-serializer.js
@@ -0,0 +1,8 @@
+"use strict";
+
+module.exports = {
+  test: value =>
+    typeof value === "string" && value.indexOf(process.cwd()) !== -1,
+  print: (value, serializer) =>
+    serializer(value.replace(process.cwd(), "<cwd>"))
+};
diff --git a/tests_integration/runPrettier.js b/tests_integration/runPrettier.js
index 5646dc914..ce91e5965 100644
--- a/tests_integration/runPrettier.js
+++ b/tests_integration/runPrettier.js
@@ -1,6 +1,7 @@
 "use strict";
 
 const path = require("path");
+const fs = require("fs");
 
 function runPrettier(dir, args, options) {
   let status;
@@ -49,6 +50,13 @@ function runPrettier(dir, args, options) {
     }
   });
 
+  const write = [];
+
+  const spiedFsWriteFileSync = jest.spyOn(fs, "writeFileSync");
+  spiedFsWriteFileSync.mockImplementation((filename, content) => {
+    write.push({ filename, content });
+  });
+
   const originalCwd = process.cwd();
   const originalIsTTY = process.stdin.isTTY;
   const originalArgv = process.argv;
@@ -81,9 +89,10 @@ function runPrettier(dir, args, options) {
     spiedConsoleLog.mockRestore();
     spiedConsoleWarn.mockRestore();
     spiedConsoleError.mockRestore();
+    spiedFsWriteFileSync.mockRestore();
   }
 
-  return { status, stdout, stderr };
+  return { status, stdout, stderr, write };
 }
 
 function normalizeDir(dir) {