A simple test

Download the following JARs and put them on your test classpath: 
	junit.jar
	hamcrest-core.jar

	%java
		package testexample;

		import org.junit.Test;
		import org.junit.Assert.*;
		import junit.framework.*;

		public class Testexample {
		    
		    public static void main(String[] args) {
			new Junittest().testConcatenate();
		    }
		}

		class MyClass {
		    public String concatenate(String a, String b) {
			return a + b;
		    }
		}

		class Junittest extends TestCase {

		    @Test
		    public static void testConcatenate() {
			
			MyClass m = new MyClass();
			String result = m.concatenate("ab", "cd");
			
			assertEquals("abcd", result);
			System.out.println("test pass");
			    // If the two values are equal, nothing happens. 
			    // The assertEquals() method returns normally. 
			    // If the two values are not equal, 
                            // an exception is thrown, and the test method stops executing here. 
			
			assertEquals("abcdx", result);
			    // Exception thrown
		    }
		}