add Immutable pretty-format plugins for Immutable.OrderedSet and Immu… (

#2899)

* add Immutable pretty-format plugins for Immutable.OrderedSet and Immutable.List

* adding immutable pretty-format plugins

* update yarn.lock with immutable library

* adding support for react components in Immutable pretty-format plugins

* adding copyright header

* refactor printImmutable method

* fix flow check

* add support for opts {min: false} for immutable plugins

* change ES2015 spread syntax to .concat

* add missing semicolon

* refactor printImmutable

* adding trailing comma when {min: false}

* refactor immutable tests using expect.extend toPrettyPrintTo

package.json

@@ -19,6 +19,7 @@
     "flow-bin": "^0.39.0",
     "glob": "^7.1.1",
     "graceful-fs": "^4.1.11",
+    "immutable": "^3.8.1",
     "istanbul-api": "^1.1.0",
     "istanbul-lib-coverage": "^1.0.0",
     "jasmine-reporters": "^2.2.0",

packages/jest-diff/src/index.js

@@ -15,6 +15,7 @@ import type {DiffOptions} from './diffStrings';
 const ReactElementPlugin = require('pretty-format/build/plugins/ReactElement');
 const ReactTestComponentPlugin = require('pretty-format/build/plugins/ReactTestComponent');
 const AsymmetricMatcherPlugin = require('pretty-format/build/plugins/AsymmetricMatcher');
+const ImmutablePlugins = require('pretty-format/build/plugins/ImmutablePlugins');
 
 const chalk = require('chalk');
 const diffStrings = require('./diffStrings');
@@ -30,7 +31,7 @@ const PLUGINS = [
   ReactTestComponentPlugin,
   ReactElementPlugin,
   AsymmetricMatcherPlugin,
-];
+].concat(ImmutablePlugins);
 const FORMAT_OPTIONS = {
   plugins: PLUGINS,
 };

packages/jest-matcher-utils/src/index.js

@@ -13,8 +13,13 @@
 const chalk = require('chalk');
 const prettyFormat = require('pretty-format');
 const AsymmetricMatcherPlugin = require('pretty-format/build/plugins/AsymmetricMatcher');
+const ReactElementPlugin = require('pretty-format/build/plugins/ReactElement');
+const ImmutablePlugins = require('pretty-format/build/plugins/ImmutablePlugins');
 
-const PLUGINS = [AsymmetricMatcherPlugin];
+const PLUGINS = [
+  AsymmetricMatcherPlugin, 
+  ReactElementPlugin,
+].concat(ImmutablePlugins);
 
 export type ValueType =
   | 'array'

packages/jest-snapshot/src/__tests__/plugins-test.js

@@ -31,7 +31,7 @@ const testPath = names => {
 it('gets plugins', () => {
   const {getSerializers} = require('../plugins');
   const plugins = getSerializers();
-  expect(plugins.length).toBe(2);
+  expect(plugins.length).toBe(8);
 });
 
 it('adds plugins from an empty array', () => testPath([]));

packages/jest-snapshot/src/plugins.js

@@ -11,8 +11,12 @@
 
 const ReactElementPlugin = require('pretty-format/build/plugins/ReactElement');
 const ReactTestComponentPlugin = require('pretty-format/build/plugins/ReactTestComponent');
+const ImmutablePlugins = require('pretty-format/build/plugins/ImmutablePlugins');
 
-let PLUGINS = [ReactElementPlugin, ReactTestComponentPlugin];
+let PLUGINS = [
+  ReactElementPlugin, 
+  ReactTestComponentPlugin,
+].concat(ImmutablePlugins);
 
 // Prepend to list so the last added is the first tested.
 exports.addSerializer = (plugin: any) => {