packager: DependencyGraph-test: mock child_process

Reviewed By: cpojer

Differential Revision: D4182064

fbshipit-source-id: e645e6d952e3aeaadaf35e29d6fcaf6395e590a7

packager/react-packager/src/node-haste/__tests__/DependencyGraph-test.js

@@ -13,7 +13,10 @@ jest.useRealTimers();
 jest
   .mock('fs')
   .mock('../../Logger')
-  .mock('../../lib/TransformCache');
+  .mock('../../lib/TransformCache')
+  // It's noticeably faster to prevent running watchman from FileWatcher.
+  .mock('child_process', () => ({}))
+  ;
 
 // This is an ugly hack:
 // * jest-haste-map uses `find` for fast file system crawling which won't work