JUnit - Execution process

JUnit - Execution process

This tutorial illustrates the method execution procedure in JUnit, which method is called first and which method is called after a method. The following is the API for the JUnit test method, which is illustraten by example.

In Directory C: This is JUNIT_WORKSPACE to test the annotation program by creating a java class file .java JunitAnnotation.

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

public class ExecutionProcedureJunit {

   //execute only once, in the starting 
   @BeforeClass
   public static void beforeClass() {
      System.out.println("in before class");
   }

   //execute only once, in the end
   @AfterClass
   public static void  afterClass() {
      System.out.println("in after class");
   }

   //execute for each test, before executing test
   @Before
   public void before() {
      System.out.println("in before");
   }

   //execute for each test, after executing test
   @After
   public void after() {
      System.out.println("in after");
   }

   //test case 1
   @Test
   public void testCase1() {
      System.out.println("in test case 1");
   }

   //test case 2
   @Test
   public void testCase2() {
      System.out.println("in test case 2");
   }
}

Next, let's go to Directory C: The user JUNIT_WORKSPACE java class file TestRunner in the .java to perform the annotation program.

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class TestRunner {
   public static void main(String[] args) {
      Result result = JUnitCore.runClasses(ExecutionProcedureJunit.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
} 

Use the javac command to compile the Test case and Test Runner classes.

C:\JUNIT_WORKSPACE>javac ExecutionProcedureJunit.java TestRunner.java

Now run Test Runner and it will automatically run the test samples defined in the Test Case class.

C:\JUNIT_WORKSPACE>java TestRunner

Verify the output

in before class
in before
in test case 1
in after
in before
in test case 2
in after
in after class

Observe the output above, which is the JUnite execution:

• The beforeClass() method executes first and only once.
• The afterClass() method is executed last and only once.
• The before() method is executed for each test case, but only before the test case is executed.
• The after() method is executed for each test case, but only after the test case is executed.
• Each test case is executed between the before() method and the after() method.