The use of JUNIT4 in Java

Junti Test Project:

Software Development process: Project research, demand analysis, software design, program coding, software testing, operation and maintenance.

Common methods of testing:

Black box test: No need to consider the internal structure of testing software

White Box testing: The internal structure of the test code needs to be clear

Regression test: Refers to the program code is modified, re-test, verify that the changes did not raise a new error.

Unit Test: A function or block of code in the main test program.

JUnit Framework Composition: TestCase, TestSuite, Testrunner three classes

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Error: Indicates an error in the code itself.

Failures: The assertion is inconsistent with the expected result and the test fails.

junit--Reflection Technology

JUNIT4--JDK annotation Technology

Junit4 commonly used annotations:

     @Before: Used to annotate the method to be executed before each test method executes

     @After: A method for labeling the execution of each test method

     @Test: Used to label a test method
    
     @Ignore: A test method for labeling pending participation
    
      @BeforeClass: The method of labeling runs the

     @AfterClass one time before all test methods of the entire class are run: The method of labeling is run at the end of all test methods of the entire class at run-time

to test the code with JUNIT4:

1. Create a tested class

2. Import JUNIT4 Rack Package

3. Create a test class (the test code and the test code are in a different directory than the package)

4. Select test Method

5. Create an instance of the class being tested, call the test method of the test class object in the test method, and use the
Assert.assert method.

For example:

Calculator cal =new Calculator ();    @Test public void Add () {Cal.add (3);    Cal.add (2);     Assertequals (5,result); }

Tips for using:

1. The unit test code and the test code are different directories.

Note @test in the test class in 2.JUNIT4 must have, the method name does not need to start with test, and the test method must be
Public modifier, the return value must be void and cannot have parameters. This test party is ignored @Ignore added.

3.JUNIT4: Import static org.junit.assert.*, static import will not need to use the

Assert.assert* () method, direct assert* () method.

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The use of JUNIT4 in Java