• September 4, 2014
  • JUnit
  • Comments Off on JUnit tutorial

JUnit tutorial

Testing:

Testing is the process of checking an application that it is working as expected. Working as expected means for a known input it must give the expected output. In other words testing is a process of verification and validation.

Unit testing:

Unit testing is the testing of an individual unit (class/method) or group of related units.

Types of unit testing:

1. Manual testing
2. Automated testing

Manual testing:

Manual testing is the process of executing a test case without any tool support.

Automated testing:

Automated testing is the process of executing a test case with any tool support.

JUnit:

JUnit is an open-source unit testing framework for java programmers. It is only used for unit testing. Integration testing is done by TestNG.

Unit test case:

Unit test case is part of code which executes to check that another part of the code works as expected.

Note: We have to write two test cases for every requirement/sub-requirement one positive and one negative.

Annotations for Junit testing:

1. @Test: It is used to specify the test method.

2. @BeforeClass: It is used to specify that method will be called only once, before starting all the test cases.

3. @AfterClass: It is used to specify that method will be called only once, after finishing all the test cases.

4. @Before: It is used to specify that method will be called before each test case.

5. @After: It is used to specify that method will be called after each test case.

6. @Ignore: It is used to ignore the test case.

Assert class:

JUnit provides the Assert class to check the certain conditions. Assert class methods compare the output value to the expected value.

Commonly used methods of Assert class:

1. assertTrue(boolean condition): It assert that the specified boolean condition is true.

2. assertFalse(boolean condition): It assert that the specified boolean condition is false.

3. assertNull(Object obj): It assert that the specified object is null.

4. assertNotNull(Object obj): It assert that the specified object is not null.

5. assertEquals(Object expected, Object actual): It assert that two objects are equal.

6. assertSame(Object expected, Object actual): It assert that two objects refer to the same object.

 

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