Junit quick guide

http://www.tutorialspoint.com/junit/junit_quick_guide.htm

Create Test Case Classes

Create a java class file name TestJunit1.java in C:\ > JUNIT_WORKSPACE

import org.junit.Test;
import org.junit.Ignore;
import static org.junit.Assert.assertEquals;

public class TestJunit1 {

   String message = "Robert"; 
   MessageUtil messageUtil = new MessageUtil(message);
   
   @Test
   public void testPrintMessage() { 
      System.out.println("Inside testPrintMessage()");    
      assertEquals(message, messageUtil.printMessage());     
   }
}

Create a java class file name TestJunit2.java in C:\ > JUNIT_WORKSPACE

import org.junit.Test;
import org.junit.Ignore;
import static org.junit.Assert.assertEquals;

public class TestJunit2 {

   String message = "Robert"; 
   MessageUtil messageUtil = new MessageUtil(message);
 
   @Test
   public void testSalutationMessage() {
      System.out.println("Inside testSalutationMessage()");
      message = "Hi!" + "Robert";
      assertEquals(message,messageUtil.salutationMessage());
   }
}

Create Test Suite Class

• Create a java class.
• Attach @RunWith(Suite.class) Annotation with class.
• Add reference to Junit test classes using @Suite.SuiteClasses annotation

Create a java class file name TestSuite.java in C:\ > JUNIT_WORKSPACE to execute Test case(s)

import org.junit.runner.RunWith;
import org.junit.runners.Suite;
@RunWith(Suite.class)
@Suite.SuiteClasses({
   TestJunit1.class,
   TestJunit2.class
})
public class JunitTestSuite {   
}   

Create Test Runner Class

Create a java class file name TestRunner.java in C:\ > JUNIT_WORKSPACE to execute Test case(s)

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(JunitTestSuite.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
}   

Compile all java classes using javac

C:\JUNIT_WORKSPACE>javac TestJunit1.java 
TestJunit2.java JunitTestSuite.java TestRunner.java

Now run the Test Runner which will run test case defined in provided Test Case class.

C:\JUNIT_WORKSPACE>java TestRunner

Verify the output.

Robert
Inside testSalutationMessage()
Hi Robert
true