INTERNET PROGRAMMING IIYildiz Technical University 2015
Ömer Taşkın
Unit Testing & Junit
OUTLINE
• What is Software Testing
• Types
• Unit Testing
• Integration Testing
• JUnit
• Mocking
What is Software Testing
Part of the software development life cycle
What is Software Testing
• Points out the defects and errors that were made during the development phases
• Ensures the Quality of product
• Requires lower maintenance cost
Software Testing Levels
Functional Testing
Unit Testing
Integration Testing
Security Testing
Acceptance Testing
Alpha Testing
Beta Testing
etc…
Unit Testing
A unit is the smallest testable part of an application like functions, classes, procedures, interfaces.
Unit testing is a method by which individual units of source code are tested to determine if they are fit for use.
Unit testing should be done before Integration testing.
Unit testing simplifies the debugging process.
Integration Testing
Integration testing is Unit Testing ++
Integration Testing is integrated with Databases, File System, Hardware etc.
Unit Test versus Integration Test
Unit test verifies the logic of small piece of code
Unit tests shouldn't have dependencies on outside systems
Integration test is done to demonstrate that different pieces of the system work together.
Integration tests cover whole applications
JUnit
Unit & Integration testing framework @ Java
JUnit
Unit & Integration testing framework @ Java
<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version>
</dependency>
Can be used on maven
JUnit
Requires @Test annotation to be testable method
Return type of methods have to be void
@Testpublic void sampleTestMethod() { //
}
JUnit Assertions
Assert can check value is null empty true false equals to given etc.
assertEquals();
assertTrue();
assertFalse();
assertNotNull();
assertNull();
JUnit Assertions
Assert can check value is null empty true false equals to given etc.
@Testpublic void testMethod() { Integer multipliedNums = multiply(1,3); Assert.assertEquals(3, multipliedNums );}
public Integer multiply(int first, int next) {
return x*y;}
Test passed
Mocking
Mocking is keep dependencies out of unit tests
Mocking
real objects mocked objects
Mockito
Mockito is one of Mocking framework which used in Java
<dependency><groupId>org.mockito</
groupId><artifactId>mockito-all</
artifactId><version>1.10.19</version>
</dependency>
Can be used on maven
Mockito
@Mock creates mock object
@Mockprivate CategoryDao categoryDao;
Mockito
@InjectMocks creates an instance of the class and injects the mocks that are created with the @Mock
@InjectMocksprivate CategoryController categoryController;
Mockito
when().then()
List<Category> categories = new ArrayList();
when(categoryDao.findAll()).thenReturn(categories);
when a method was called then simulate something
LET’S WORK TOGETHER!
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