Remove Jest auto mocking (#2279)

Summary:
**Summary**

Saw that the Travis CI is failing because of a new test (`isHTMLBRElement`) which did not explicitly disable auto mocking. In Sandcastle, Jest tests aren't automocked hence the tests passed internally but is failing on GitHub.

Since all the tests in the repo have `jest.disableAutomock()`, there's no value in having `automock: true` within `package.json`, we can remove it and save ourselves of this config discrepancy and further pain in future.

If we decide to go with this approach then #2278 can be abandoned/closed.

**Test Plan**

Travis CI should pass. Also check that Sandcastle passes.
Pull Request resolved: #2279

Reviewed By: mrkev

Differential Revision: D18874249

Pulled By: yangshun

fbshipit-source-id: e371558552728b395f67bf1c4d94b127cc3c2c96

Author: yangshun

package.json

@@ -87,7 +87,6 @@
     "npm": "2.x || 3.x || 5.x || 6.x"
   },
   "jest": {
-    "automock": true,
     "globals": {
       "__DEV__": true
     },

src/component/base/__tests__/DraftEditor.react-test.js

@@ -10,8 +10,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 jest.mock('generateRandomKey');
 
 const DraftEditor = require('DraftEditor.react');

src/component/contents/__tests__/DraftEditorBlock.react-test.js

@@ -11,7 +11,6 @@
 'use strict';
 
 jest
-  .disableAutomock()
   .mock('Style')
   .mock('getElementPosition')
   .mock('getScrollPosition')

src/component/contents/__tests__/DraftEditorContents.react-test.js

@@ -10,8 +10,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 jest.mock('generateRandomKey');
 
 const Editor = require('DraftEditor.react');

src/component/contents/__tests__/DraftEditorTextNode-test.js

@@ -11,7 +11,7 @@
 
 'use strict';
 
-jest.disableAutomock().mock('UserAgent');
+jest.mock('UserAgent');
 
 const BLOCK_DELIMITER_CHAR = '\n';
 const TEST_A = 'Hello';

src/component/contents/exploration/__tests__/DraftEditorBlockNode.react-test.js

@@ -11,7 +11,6 @@
 'use strict';
 
 jest
-  .disableAutomock()
   .mock('Style')
   .mock('getElementPosition')
   .mock('getScrollPosition')

src/component/contents/exploration/__tests__/DraftEditorContentsExperimental.react-test.js

@@ -10,8 +10,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 const ContentBlockNode = require('ContentBlockNode');
 const ContentState = require('ContentState');
 const DefaultDraftBlockRenderMap = require('DefaultDraftBlockRenderMap');

src/component/handlers/composition/__tests__/DraftEditorCompostionHandler-test.js

@@ -11,8 +11,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 // DraftEditorComposition uses timers to detect duplicate `compositionend`
 // events.
 jest.useFakeTimers();

src/component/handlers/edit/__tests__/editOnBeforeInput-test.js

@@ -11,8 +11,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 import type DraftEditor from 'DraftEditor.react';
 
 const CompositeDraftDecorator = require('CompositeDraftDecorator');

src/component/handlers/edit/__tests__/editOnBlur-test.js

@@ -11,8 +11,6 @@
 
 'use strict';
 
-jest.disableAutomock();
-
 const ContentBlock = require('ContentBlock');
 const ContentState = require('ContentState');
 const EditorState = require('EditorState');