A simple JUnit test for when you just can’t remember the Mule JUnit testing syntax 😉

Mule flow
A Mule flow that takes a username as input and concatenates it with a “Hello”. The request is done by a GET call:

Flow code

    <http:listener-config 
       name="HTTP_Listener_Configuration" 
       host="0.0.0.0" 
       port="8081" 
       doc:name="HTTP Listener Configuration">
    
        <http:listener 
           config-ref="HTTP_Listener_Configuration" 
           path="/test" 
           doc:name="HTTP">
        <set-payload 
           value="#['Hello '+message.inboundProperties.'http.query.params'.username]" 
           doc:name="Set Payload">
    

Java test code:

import org.junit.Test;
import org.mule.DefaultMuleMessage;
import org.mule.api.MuleMessage;
import org.mule.api.client.MuleClient;
import org.mule.tck.junit4.FunctionalTestCase;

import junit.framework.Assert;

public class MyTests extends FunctionalTestCase {
	
	@Test
	public void testMyFlow() throws Exception {
        // Get the Mule Context
		MuleClient muleClient = muleContext.getClient();
		
        // Create an empty test Mule message
		DefaultMuleMessage message = 
                        new DefaultMuleMessage(null, muleContext);
		
        // Make a call to the tested web service
		MuleMessage responseMessage = muleClient.send(
                       "http://localhost:8081/test?username=Niklas", 
                       message
                    );
		
        // Get response as a string
		String responsePayload = responseMessage.getPayloadAsString();
		
        // Assert response
		Assert.assertEquals("Hello Niklas", responsePayload);
		
	}
	
	@Override
	protected String[] getConfigFiles() {
         // Path to the Mule configuration file that is being tested
		return new String[]{"src/main/app/helloworld.xml"};
	}

}

Tested on OSX 10.15.7, Mule 3.9.4, and JUnit 4.13