Fix mocking for modules with folders on windows

Author: KELiON

packages/jest-haste-map/src/get_mock_name.js

@@ -14,7 +14,9 @@ const MOCKS_PATTERN = path.sep + '__mocks__' + path.sep;
 
 const getMockName = (filePath: string) => {
   const mockPath = filePath.split(MOCKS_PATTERN)[1];
-  return mockPath.substring(0, mockPath.lastIndexOf(path.extname(mockPath)));
+  return mockPath
+    .substring(0, mockPath.lastIndexOf(path.extname(mockPath)))
+    .replace(/\\/g, '/');
 };
 
 module.exports = getMockName;