Added some languages to missing markdown fencing blocks (#5378)

* Touching up some markdown rules

* Missed 3 files!

* Addressed linter error, reverted a block that wasn't actually js

* run lint:md

README.md

@@ -1,29 +1,35 @@
 # Jest
 
 [![CircleCI Build Status](https://circleci.com/gh/facebook/jest.svg?style=shield)](https://circleci.com/gh/facebook/jest)
-[![Travis Build Status](https://travis-ci.org/facebook/jest.svg?branch=master)](https://travis-ci.org/facebook/jest) [![Windows Build Status](https://ci.appveyor.com/api/projects/status/8n38o44k585hhvhd/branch/master?svg=true)](https://ci.appveyor.com/project/Daniel15/jest/branch/master) [![npm version](https://badge.fury.io/js/jest.svg)](http://badge.fury.io/js/jest)
+[![Travis Build Status](https://travis-ci.org/facebook/jest.svg?branch=master)](https://travis-ci.org/facebook/jest)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/8n38o44k585hhvhd/branch/master?svg=true)](https://ci.appveyor.com/project/Daniel15/jest/branch/master)
+[![npm version](https://badge.fury.io/js/jest.svg)](http://badge.fury.io/js/jest)
 
 🃏 Delightful JavaScript Testing
 
-- **👩🏻‍💻 Easy Setup**: Complete and easy to set-up JavaScript testing solution. Works out of the box for any React project.
+* **👩🏻‍💻 Easy Setup**: Complete and easy to set-up JavaScript testing solution.
+  Works out of the box for any React project.
 
-- **🏃🏽 Instant Feedback**: Fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.
+* **🏃🏽 Instant Feedback**: Fast interactive watch mode runs only test files
+  related to changed files and is optimized to give signal quickly.
 
-- **📸 Snapshot Testing**: Capture snapshots of React trees or other serializable values to simplify testing and to analyze how state changes over time.
+* **📸 Snapshot Testing**: Capture snapshots of React trees or other
+  serializable values to simplify testing and to analyze how state changes over
+  time.
 
 ## Getting Started
 
 <!-- generated_getting_started_start -->
 
 Install Jest using [`npm`](https://www.npmjs.com/):
 
-```
+```bash
 npm install --save-dev jest
 ```
 
 Or via [`yarn`](https://yarnpkg.com/en/package/jest):
 
-```
+```bash
 yarn add --dev jest
 ```
 
@@ -59,7 +65,7 @@ Add the following section to your `package.json`:
 
 Finally, run `npm test` and Jest will print this message:
 
-```
+```bash
 PASS  ./sum.test.js
 ✓ adds 1 + 2 to equal 3 (5ms)
 ```
@@ -83,7 +89,8 @@ jest my-test --notify --config=config.json
 ```
 
 If you'd like to learn more about running `jest` through the command line, take
-a look at the [Jest CLI Options](https://facebook.github.io/jest/docs/cli.html) page.
+a look at the [Jest CLI Options](https://facebook.github.io/jest/docs/cli.html)
+page.
 
 ## Additional Configuration
 
@@ -92,14 +99,14 @@ a look at the [Jest CLI Options](https://facebook.github.io/jest/docs/cli.html)
 To use [Babel](http://babeljs.io/), install the `babel-jest` and
 `regenerator-runtime` packages:
 
-```
+```bash
 npm install --save-dev babel-jest babel-core regenerator-runtime
 ```
 
 > Note: If you are using a babel version 7 then you need to install `babel-jest`
 > with the following command:
 >
-> ```
+> ```bash
 > npm install --save-dev babel-jest 'babel-core@^7.0.0-0' @babel/core regenerator-runtime
 > ```
 
@@ -165,11 +172,13 @@ started.
 
 To use TypeScript in your tests you can use
 [ts-jest](https://github.com/kulshekhar/ts-jest).
+
 <!-- generated_getting_started_end -->
 
 ## Documentation
 
-Learn more about using Jest at http://facebook.github.io/jest
+Learn more about using
+[Jest on the official site!](http://facebook.github.io/jest)
 
 * [Getting Started](http://facebook.github.io/jest/docs/en/getting-started.html)
 * [Guides](http://facebook.github.io/jest/docs/en/snapshot-testing.html)
@@ -178,14 +187,18 @@ Learn more about using Jest at http://facebook.github.io/jest
 
 ## Badge
 
-Show the world you're using *Jest* → [![tested with jest](https://img.shields.io/badge/tested_with-jest-99424f.svg)](https://github.com/facebook/jest)
+Show the world you're using _Jest_ →
+[![tested with jest](https://img.shields.io/badge/tested_with-jest-99424f.svg)](https://github.com/facebook/jest)
 
 ```md
 [![tested with jest](https://img.shields.io/badge/tested_with-jest-99424f.svg)](https://github.com/facebook/jest)
 ```
 
 ## Contributing
 
-Send issues and pull requests with your ideas. For more information about contributing PRs and issues, see our [Contribution Guidelines](https://github.com/facebook/jest/blob/master/CONTRIBUTING.md).
+Send issues and pull requests with your ideas. For more information about
+contributing PRs and issues, see our
+[Contribution Guidelines](https://github.com/facebook/jest/blob/master/CONTRIBUTING.md).
 
-[Good First Issue](https://github.com/facebook/jest/labels/Good%20First%20Issue) is a great starting point for PRs.
+[Good First Issue](https://github.com/facebook/jest/labels/Good%20First%20Issue)
+is a great starting point for PRs.

docs/Configuration.md

@@ -591,7 +591,7 @@ module that exports a function expecting a string as the first argument for the
 path to resolve and an object with the following structure as the second
 argument:
 
-```
+```json
 {
   "basedir": string,
   "browser": bool,
@@ -766,7 +766,7 @@ test(() => {
 
 Rendered snapshot:
 
-```
+```json
 Pretty foo: Object {
   "x": 1,
   "y": 2,
@@ -907,7 +907,7 @@ specify both options.
 
 The following is a visualization of the default regex:
 
-```
+```bash
 ├── __tests__
 │   └── component.spec.js # test
 │   └── anything # test
@@ -925,7 +925,7 @@ This option allows the use of a custom results processor. This processor must be
 a node module that exports a function expecting an object with the following
 structure as the first argument and return it:
 
-```
+```json
 {
   "success": bool,
   "startTime": epoch,
@@ -976,13 +976,13 @@ implementation.
 
 The test runner module must export a function with the following signature:
 
-```
+```ts
 function testRunner(
   config: Config,
   environment: Environment,
   runtime: Runtime,
   testPath: string,
-): Promise<TestResult>
+): Promise<TestResult>;
 ```
 
 An example of such function can be found in our default

docs/ExpectAPI.md

@@ -136,7 +136,7 @@ expect.extend({
 
 This will print something like this:
 
-```
+```bash
   expect(received).toBe(expected)
 
     Expected value to be (using Object.is):
@@ -1050,7 +1050,7 @@ test('throws on octopus', () => {
 
 And it will generate the following snapshot:
 
-```
+```js
 exports[`drinking flavors throws on octopus 1`] = `"yuck, octopus flavor"`;
 ```
 

docs/GettingStarted.md

@@ -5,13 +5,13 @@ title: Getting Started
 
 Install Jest using [`npm`](https://www.npmjs.com/):
 
-```
+```bash
 npm install --save-dev jest
 ```
 
 Or via [`yarn`](https://yarnpkg.com/en/package/jest):
 
-```
+```bash
 yarn add --dev jest
 ```
 
@@ -47,7 +47,7 @@ Add the following section to your `package.json`:
 
 Finally, run `npm test` and Jest will print this message:
 
-```
+```bash
 PASS  ./sum.test.js
 ✓ adds 1 + 2 to equal 3 (5ms)
 ```
@@ -80,14 +80,14 @@ a look at the [Jest CLI Options](CLI.md) page.
 To use [Babel](http://babeljs.io/), install the `babel-jest` and
 `regenerator-runtime` packages:
 
-```
+```bash
 npm install --save-dev babel-jest babel-core regenerator-runtime
 ```
 
 > Note: If you are using a babel version 7 then you need to install `babel-jest`
 > with the following command:
 >
-> ```
+> ```bash
 > npm install --save-dev babel-jest 'babel-core@^7.0.0-0' @babel/core regenerator-runtime
 > ```
 

docs/MigrationGuide.md

@@ -32,14 +32,14 @@ dirty migration work. It runs a code transformation on your codebase using
 
 Install Jest Codemods with `npm` by running:
 
-```
+```bash
 npm install -g jest-codemods
 ```
 
 To transform your existing tests, navigate to the project containing the tests
 and run:
 
-```
+```bash
 jest-codemods
 ```
 

docs/MockFunctionAPI.md

@@ -127,25 +127,25 @@ mockFn.mock.calls[1][0] === 1; // true
 
 `mockImplementation` can also be used to mock class constructors:
 
-```
+```js
 // SomeClass.js
 module.exports = class SomeClass {
   m(a, b) {}
-}
+};
 
 // OtherModule.test.js
-jest.mock('./SomeClass');  // this happens automatically with automocking
-const SomeClass = require('./SomeClass')
-const mMock = jest.fn()
+jest.mock('./SomeClass'); // this happens automatically with automocking
+const SomeClass = require('./SomeClass');
+const mMock = jest.fn();
 SomeClass.mockImplementation(() => {
   return {
-    m: mMock
-  }
-})
+    m: mMock,
+  };
+});
 
-const some = new SomeClass()
-some.m('a', 'b')
-console.log('Calls to m: ', mMock.mock.calls)
+const some = new SomeClass();
+some.m('a', 'b');
+console.log('Calls to m: ', mMock.mock.calls);
 ```
 
 ### `mockFn.mockImplementationOnce(fn)`
@@ -154,30 +154,30 @@ Accepts a function that will be used as an implementation of the mock for one
 call to the mocked function. Can be chained so that multiple function calls
 produce different results.
 
-```
-var myMockFn = jest.fn()
+```js
+const myMockFn = jest
+  .fn()
   .mockImplementationOnce(cb => cb(null, true))
   .mockImplementationOnce(cb => cb(null, false));
 
-myMockFn((err, val) => console.log(val));
-> true
+myMockFn((err, val) => console.log(val)); // true
 
-myMockFn((err, val) => console.log(val));
-> false
+myMockFn((err, val) => console.log(val)); // false
 ```
 
 When the mocked function runs out of implementations defined with
 mockImplementationOnce, it will execute the default implementation set with
 `jest.fn(() => defaultValue)` or `.mockImplementation(() => defaultValue)` if
 they were called:
 
-```
-var myMockFn = jest.fn(() => 'default')
+```js
+const myMockFn = jest
+  .fn(() => 'default')
   .mockImplementationOnce(() => 'first call')
   .mockImplementationOnce(() => 'second call');
 
+// 'first call', 'second call', 'default', 'default'
 console.log(myMockFn(), myMockFn(), myMockFn(), myMockFn());
-> 'first call', 'second call', 'default', 'default'
 ```
 
 ### `mockFn.mockName(value)`
@@ -197,7 +197,7 @@ expect(mockFn).toHaveBeenCalled();
 
 Will result in this error:
 
-```
+```bash
     expect(mockedFunction).toHaveBeenCalled()
 
     Expected mock function to have been called.
@@ -232,14 +232,15 @@ chained so that successive calls to the mock function return different values.
 When there are no more `mockReturnValueOnce` values to use, calls will return a
 value specified by `mockReturnValue`.
 
-```
-const myMockFn = jest.fn()
+```js
+const myMockFn = jest
+  .fn()
   .mockReturnValue('default')
   .mockReturnValueOnce('first call')
   .mockReturnValueOnce('second call');
 
+// 'first call', 'second call', 'default', 'default'
 console.log(myMockFn(), myMockFn(), myMockFn(), myMockFn());
-> 'first call', 'second call', 'default', 'default'
 ```
 
 ### `mockFn.mockResolvedValue(value)`
@@ -255,7 +256,7 @@ Useful to mock async functions in async tests:
 ```js
 test('async test', async () => {
   const asyncMock = jest.fn().mockResolvedValue(43);
-  
+
   await asyncMock(); // 43
 });
 ```
@@ -272,11 +273,12 @@ Useful to resolve different values over multiple async calls:
 
 ```js
 test('async test', async () => {
-  const asyncMock = jest.fn()
+  const asyncMock = jest
+    .fn()
     .mockResolvedValue('default')
     .mockResolvedValueOnce('first call')
     .mockResolvedValueOnce('second call');
-  
+
   await asyncMock(); // first call
   await asyncMock(); // second call
   await asyncMock(); // default
@@ -297,7 +299,7 @@ Useful to create async mock functions that will always reject:
 ```js
 test('async test', async () => {
   const asyncMock = jest.fn().mockRejectedValue(new Error('Async error'));
-  
+
   await asyncMock(); // throws "Async error"
 });
 ```
@@ -314,10 +316,11 @@ Example usage:
 
 ```js
 test('async test', async () => {
-  const asyncMock = jest.fn()
+  const asyncMock = jest
+    .fn()
     .mockResolvedValueOnce('first call')
     .mockRejectedValueOnce(new Error('Async error'));
-  
+
   await asyncMock(); // first call
   await asyncMock(); // throws "Async error"
 });