Add additional globals

packages/jest-util/src/__tests__/install_common_globals.test.js

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+let installCommonGlobals;
+let fake;
+
+beforeEach(() => {
+  fake = jest.fn();
+  global.DTRACE_NET_SERVER_CONNECTION = fake;
+
+  installCommonGlobals = require('../install_common_globals').default;
+});
+
+it('returns the passed object', () => {
+  const myGlobal = {};
+
+  expect(installCommonGlobals(myGlobal, {})).toBe(myGlobal);
+});
+
+it('turns a V8 global object into a Node global object', () => {
+  const myGlobal = installCommonGlobals({}, {});
+
+  expect(myGlobal.process).toBeDefined();
+  expect(myGlobal.DTRACE_NET_SERVER_CONNECTION).toBeDefined();
+
+  expect(myGlobal.DTRACE_NET_SERVER_CONNECTION).not.toBe(fake);
+  myGlobal.DTRACE_NET_SERVER_CONNECTION();
+  expect(fake.mock.calls.length).toBe(1);
+});

packages/jest-util/src/install_common_globals.js

@@ -13,13 +13,23 @@ import type {Global} from 'types/Global';
 import createProcesObject from './create_process_object';
 import deepCyclicCopy from './deep_cyclic_copy';
 
+const DTRACE = Object.keys(global).filter(key => key.startsWith('DTRACE'));
+
 export default function(globalObject: Global, globals: ConfigGlobals) {
   globalObject.process = createProcesObject();
 
   // Forward some APIs.
+  DTRACE.forEach(dtrace => {
+    globalObject[dtrace] = function(...args) {
+      return global[dtrace].apply(this, args);
+    };
+  });
+
+  // Forward some others (this breaks the sandbox but for now it's OK).
   globalObject.Buffer = global.Buffer;
   globalObject.setImmediate = global.setImmediate;
   globalObject.clearImmediate = global.clearImmediate;
 
-  Object.assign(global, deepCyclicCopy(globals));
+  // $FlowFixMe: assigning an object.
+  return Object.assign(globalObject, deepCyclicCopy(globals));
 }