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Unit test your *LocalServiceImpl
Thiago Moreira Professional Services Manager !Fernando Tadashi Akimoto Consultant
Content• Why test LocalServiceImpl classes?
• Past attempts to test
• Our findings: Mock API
• How to set up unit tests
• Sample application
• Mocking objects
• Mocking static methods
• Mocking static void methods
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Why unit test *LocalServiceImpl classes?• Reduce bugs in new features
• Reduce bugs in existing features
• Improve Design
• Allow Refactoring
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Past attempts to test• Very difficult set up portal context
• Complex object dependencies
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Example:
MyPersistence persistence = new MyPersistenceImpl();// Fail!!!
MyLocalServiceImpl service = new MyLocalServiceIml();
service.setMyPersistence(persistence);
Our findings: Mock APIEasyMock
“EasyMock provides Mock Objects for interfaces (and objects through the class extension) by generating them on the fly using Java's proxy mechanism. Due to EasyMock's unique style of recording expectations, most refactorings will not affect the Mock Objects. So EasyMock is a perfect fit for Test-‐Driven Development.”
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PowerMock
“PowerMock is a framework that extend other mock libraries such as EasyMock with more powerful capabilities. PowerMock uses a custom classloader and bytecode manipulation to enable mocking of static methods, constructors, final classes and methods, private methods, removal of static initializers and more.”
How to set up unit tests • Add maven dependencies:
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<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-easymock</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
*${powermock.version} - 1.5.1 (latest version)
Unit tests steps
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Create MockSet
expectationsSet ready (replay)
Test Verify
!CounterLocalService counterLocalService = createNiceMock(CounterLocalService.class);
!!expected( counterLocalService.increment(EasyMock.anyObject()) ).andReturn(testId);
!!replay(counterLocalService);
!!Car car = service.addCar(brand, model, manufacturingYear, fuelType, …);
!!!verify(counterLocalService);
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Mocking ObjectsCreate Mock
Set expectati
ons
Set ready (replay)
Test
Verify
long newTestId = counterLocalService.increment(Car.class.getName());
Mocking static methods
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!PowerMock.mockStatic(PortalClassInvoker.class);
!!expect( PortalClassInvoker.invoke(…) ).andReturn(12);
!!PowerMock.replay(PortalClassInvoker.class);
!!Object object = PortalClassInvoker.invoke(…);
!!PowerMock.verify(PortalClassInvoker.class);
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Create Mock
Set expectati
ons
Set ready (replay)
Test
Verify
!PowerMock.mockStatic(WorkflowHandlerRegistryUtil.class);
!!WorkflowHandlerRegistryUtil.startWorkflowInstance(…);
!!PowerMock.replay(WorkflowHandlerRegistryUtil.class);
!!Car car = service.addCar(brand, model, manufacturingYear, …);
!!!PowerMock.verify(WorkflowHandlerRegistryUtil.class);
!
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Mocking static void methods
Create Mock
Set expectati
ons
Set ready (replay)
Test
Verify
WorkflowHandlerRegistryUtil.startWorkflowInstance(…);
References• Top 12 Reasons to Write Unit Tests -‐ http://www.onjava.com/pub/a/onjava/2003/04/02/javaxpckbk.html
• Easy Mock -‐ http://easymock.org
• Power Mock -‐ https://code.google.com/p/powermock
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Questions?
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Thank you guys!
Thiago Moreira Professional Services Manager
Fernando Tadashi Akimoto Consultant
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