Add tests for genMockFromModule

examples/automatic_mocks/__tests__/genMockFromModule.test.js

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+// Copyright 2004-present Facebook. All Rights Reserved.
+
+//we need to disable automocking because is enabled on config in this example
+jest.disableAutomock();
+
+import utils from '../utilsMocked';
+
+test('if exist additional implementation', () => {
+  console.log(utils.isAuthorized.getMockImplementation.getMockImplementation);
+  // expect(utils.authorized('wizzard')).toBeTruthy();
+});
+
+test('mocked implementation', () => {
+  expect(utils.authorize._isMockFunction).toBe(true);
+  expect(utils.isAuthorized._isMockFunction).toBe(true);
+});

examples/automatic_mocks/utilsMocked.js

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+// Copyright 2004-present Facebook. All Rights Reserved.
+
+const utils = jest.genMockFromModule('./utils');
+// All implementation from original urils module is now mocked
+
+utils.isAuthorized = secret => {
+  console.log(123123123123);
+  return secret === 'not_wizzard';
+};
+
+module.exports = utils;
+
+//
+// const fs = jest.genMockFromModule('fs');
+//
+// // This is a custom function that our tests can use during setup to specify
+// // what the files on the "mock" filesystem should look like when any of the
+// // `fs` APIs are used.
+// let mockFiles = Object.create(null);
+// function __setMockFiles(newMockFiles) {
+//   mockFiles = Object.create(null);
+//   for (const file in newMockFiles) {
+//     const dir = path.dirname(file);
+//
+//     if (!mockFiles[dir]) {
+//       mockFiles[dir] = [];
+//     }
+//     mockFiles[dir].push(path.basename(file));
+//   }
+// }
+//
+// // A custom version of `readdirSync` that reads from the special mocked out
+// // file list set via __setMockFiles
+// function readdirSync(directoryPath) {
+//   return mockFiles[directoryPath] || [];
+// }
+//
+// fs.__setMockFiles = __setMockFiles;
+// fs.readdirSync = readdirSync;
+//
+// module.exports = fs;