Fix mocks in NavigationExperimental

Summary:Fixes mocking in NavigationExperimental tests and manually mock React to make things pass
Closes https://github.com/facebook/react-native/pull/6124

Differential Revision: D2970955

fb-gh-sync-id: ece45f1193a23a39d49fb9c2f529e1d709189f31
shipit-source-id: ece45f1193a23a39d49fb9c2f529e1d709189f31

Libraries/NavigationExperimental/Reducer/__tests__/NavigationFindReducer-test.js

@@ -11,8 +11,7 @@
 'use strict';
 
 jest
- .autoMockOff()
- .mock('ErrorUtils');
+ .dontMock('NavigationFindReducer');
 
 const NavigationFindReducer = require('NavigationFindReducer');
 

Libraries/NavigationExperimental/Reducer/__tests__/NavigationStackReducer-test.js

@@ -11,8 +11,11 @@
 'use strict';
 
 jest
- .autoMockOff()
- .mock('ErrorUtils');
+ .dontMock('NavigationRootContainer')
+ .dontMock('NavigationStackReducer')
+ .dontMock('NavigationStateUtils');
+
+jest.setMock('React', {Component() {}, PropTypes: {}});
 
 const NavigationStackReducer = require('NavigationStackReducer');
 const NavigationRootContainer = require('NavigationRootContainer');

Libraries/NavigationExperimental/Reducer/__tests__/NavigationTabsReducer-test.js

@@ -11,8 +11,9 @@
 'use strict';
 
 jest
- .autoMockOff()
- .mock('ErrorUtils');
+ .dontMock('NavigationTabsReducer')
+ .dontMock('NavigationFindReducer')
+ .dontMock('NavigationStateUtils');
 
 const NavigationTabsReducer = require('NavigationTabsReducer');
 

Libraries/NavigationExperimental/__tests__/NavigationStateUtils-test.js

@@ -11,8 +11,7 @@
 'use strict';
 
 jest
- .autoMockOff()
- .mock('ErrorUtils');
+ .dontMock('NavigationStateUtils');
 
 var NavigationStateUtils = require('NavigationStateUtils');