JUnit 4 Hello World

by David Janzen

TestHelloWorld.java

import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.Test;


public class TestHelloWorld {

   private HelloWorld h;
	
   @Before
   public void setUp() throws Exception 
   {
      h = new HelloWorld();
   }

   @Test
   public void testHelloEmpty() 
   {
      assertEquals(h.getName(),"");
      assertEquals(h.getMessage(),"Hello!");
   }
	
   @Test
   public void testHelloWorld() 
   {
      h.setName("World");
      assertEquals(h.getName(),"World");
      assertEquals(h.getMessage(),"Hello World!");
   }
}

HelloWorld.java

public class HelloWorld 
{
	
   private String name = "";

   public String getName() 
   {
      return name;
   }

   public String getMessage() 
   {
      if (name == "") 
      {
         return "Hello!";
      }
      else 
      {
         return "Hello " + name + "!";
      }
   }

   public void setName(String name) 
   {
      this.name = name;
   }
		
}

AllTests.java

import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import junit.framework.JUnit4TestAdapter;

// This section declares all of the test classes in your program.
@RunWith(Suite.class)
@Suite.SuiteClasses({
   TestHelloWorld.class  // Add test classes here.
})

public class AllTests 
{
	//This can be empty if you are using an IDE that includes support for JUnit
	//such as Eclipse.  However, if you are using Java on the command line or
	//with a simpler IDE like JGrasp or jCreator, the following main() and suite()
	//might be helpful.

    // Execution begins at main().  In this test class, we will execute
    // a text test runner that will tell you if any of your tests fail.
    public static void main (String[] args) 
    {
       junit.textui.TestRunner.run (suite());
    }

    // The suite() method is helpful when using JUnit 3 Test Runners or Ant.
    public static junit.framework.Test suite() 
    {
       return new JUnit4TestAdapter(AllTests.class);
    }

}