diff --git a/jest/jest-tests.ts b/jest/jest-tests.ts
index da141ef9e..f3e33c406 100644
--- a/jest/jest-tests.ts
+++ b/jest/jest-tests.ts
@@ -1,7 +1,7 @@
 /// <reference path="jest.d.ts" />
 
 // Tests based on the Jest website
-jest.dontMock('../sum');
+jest.unmock('../sum');
 
 describe('sum', function() {
     it('adds 1 + 2 to equal 3', function() {
@@ -16,7 +16,7 @@ describe('fetchCurrentUser', function() {
         var fetchCurrentUser = require('../fetchCurrentUser');
 
         // Create a mock function for our callback
-        var callback = jest.genMockFunction();
+        var callback = jest.fn();
         fetchCurrentUser(callback);
 
         // Now we emulate the process by which `$.ajax` would execute its own
@@ -35,7 +35,9 @@ describe('fetchCurrentUser', function() {
     });
 });
 
-jest.dontMock('../displayUser.js')
+// unmock is the recommended approach for unmocking...
+jest.unmock('../displayUser.js')
+// ...but dontMock also still works.
 jest.dontMock('jquery');
 
 describe('displayUser', function() {
@@ -70,7 +72,7 @@ describe('displayUser', function() {
     });
 });
 
-jest.dontMock('../CheckboxWithLabel.js');
+jest.unmock('../CheckboxWithLabel.js');
 describe('CheckboxWithLabel', function() {
     it('changes the text after click', function() {
         var React = require('react/addons');
@@ -99,7 +101,7 @@ describe('CheckboxWithLabel', function() {
 });
 
 function testInstances() {
-    var mockFn = jest.genMockFunction<Function>();
+    var mockFn = jest.fn<Function>();
     var a = new mockFn();
     var b = new mockFn();
 
@@ -108,7 +110,7 @@ function testInstances() {
 }
 
 function testMockImplementation() {
-    var mockFn = jest.genMockFunction<Function>().mockImplementation(function (scalar:number):number {
+    var mockFn = jest.fn<Function>().mockImplementation(function (scalar:number):number {
         return 42 + scalar;
     });
 
@@ -120,4 +122,4 @@ function testMockImplementation() {
 
     mockFn.mock.calls[0][0] === 0; // true
     mockFn.mock.calls[1][0] === 1; // true
-}
\ No newline at end of file
+}
diff --git a/jest/jest.d.ts b/jest/jest.d.ts
index d236d07db..033dd23fa 100644
--- a/jest/jest.d.ts
+++ b/jest/jest.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Jest 0.1.18
+// Type definitions for Jest 0.9.0
 // Project: http://facebook.github.io/jest/
 // Definitions by: Asana <https://asana.com>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -26,15 +26,15 @@ declare namespace jest {
     function autoMockOn(): void;
     function clearAllTimers(): void;
     function currentTestPath(): string;
+    function fn<T>(implementation?: Function): Mock<T>;
     function dontMock(moduleName: string): void;
     function genMockFromModule<T>(moduleName: string): Mock<T>;
-    function genMockFunction<T>(): Mock<T>;
-    function genMockFn<T>(): Mock<T>;
     function mock(moduleName: string): void;
     function runAllTicks(): void;
     function runAllTimers(): void;
     function runOnlyPendingTimers(): void;
     function setMock<T>(moduleName: string, moduleExports: T): void;
+    function unmock(moduleName: string): void;
 
     interface EmptyFunction {
         (): void;