Introduction to AndroidMock

Introduction to AndroidMock

• 1.
  Introduction to AndroidMock Li-Wei Cheng
• 2.
  Outline • What's Mock Object ? • Popular Mock libraries. • Why using AndroidMock ? • Example • Use AndroidMock in app • Use AndroidMock in system service
• 3.
  What's Mock Object? • A simulated objects that mimic the behavior of real objects in controlled ways. • Usually used in Unit Test Framework. o Used to do the isolation test. • Java has many popular mock libraries such as EasyMock, JMock ... etc. • Android also has its mock library called AndroidMock.
• 4.
  Popular mock libraries • EasyMock o Java o EasyMock 3.1 has the feature for Class Mocking • JMock o Java Mock Library • moQ o .NET Interface Class + • Google Mock Mocking Mocking o C++
• 5.
  Why using AndroidMock? • Dalvik VM is limited for supporting mocking. • EasyMock only can support interface mocking in Dalvik VM even it has realized the class mocking. • AndroidMock is based on EasyMock. • AndoirdMock's class mocking is achieved by o Interface Mocking to EasyMock o Use annotation to generate the helper class
• 6.
  Example package com.google.android.testing.mocktest.test; import com.google.android.testing.mocking.AndroidMock; publicclass MockingTest extends TestCase { @UsesMocks(ClassToMock.class) 1. pre-generate the helper class for AndroidMock public void testMocks() throws ClassNotFoundException { ClassToMock myMockObject = 2. create a mock object AndroidMock.createMock(ClassToMock.class); AndroidMock.expect(myMockObject.getString()).andReturn("Woohoo"); AndroidMock.expect(myMockObject.getNextInt(2)).andReturn(42); 3. record behavior AndroidMock.replay(myMockObject); 4. replay the behavior assertEquals("Woohoo", myMockObject.getString()); assertEquals(42, myMockObject.getNextInt(2)); 5. test AndroidMock.verify(myMockObject); 6. verified whether all the record behaviors are executed } }
• 7.
  Compilation flow forAndroidMock
• 8.
  Limitation for AndroidMock(EasyMock) • It can't mock final method. o If it mocks, it will execute the origin logic. • It can't mock static method. o If it mocks, it will execute the origin logic. • It can't mock private method. o If it mocks, it will execute the origin logic. • some special methods can't be mocked o equals() o toString() o hashCode()
• 9.
  Reference • http://code.google.com/p/android-mock/ • http://en.wikipedia.org/wiki/Mock_object
• 10.
  Appendix • Setup the Eclipse to use AndroidMock o Setup AndroidMock in the Eclipse.doc
• 11.
  Any Question ?