JUnit - Execution Procedure

This chapter explains the execution procedure of methods in JUnit, which defines the order of the methods called. 

Create a java class file named ExecutionProcedureJunit.java in C:\>JUNIT_WORKSPACE to test annotation.

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, create a java class file named TestRunner.java in C:\>JUNIT_WORKSPACE to execute annotations.

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());
   }
} 

Compile the Test case and Test Runner classes using javac.

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

Now run the Test Runner, which will run the test case defined in the provided 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

See the above output. The execution procedure is as follows −

• First of all, the beforeClass() method executes only once.
• The afterClass() method executes only once.
• The before() method executes for each test case, but before executing the test case.
• The after() method executes for each test case, but after the execution of test case.
• In between before() and after(), each test case executes.