Some time has passed since part one of this blog post series and we have made some improvements on the Citrus Arquillian extension. So we can look forward to this post as we move on with a more complex test scenario where we include some Citrus mail server within our test. In part one we have already combined both frameworks Arquillian and Citrus with a basic example.
Let me recap first what we have so far. Citrus is part of the Arquillian test execution and we are able to call our employee REST JEE service which is deployed in an embedded Wildfly application server. Arquillian takes care on the test deployment and provides resources such as the endpoint URL to call. In our first test we called the employee service adding new employees and getting the complete list of all employees via REST.
Now we want to extend the employee service so that each new employee gets a welcome email message. Therefore we extend the employee JEE EJB with a mail session bean that is able to send email messages.
The employee service calls a mail session bean implementation when the email field is set on the new employee. The mail message is sent to the employee mail address as recipient and is a basic text message with subject and text body part. Lets have a closer look at the mail session bean implementation that uses Java mail API for creating sending out the mail mime message.
Now in our test scenario we need a valid SMTP mail server on host localhost and port 2222. Fortunately Citrus is able to provide such a mail server so we add the citrus-mail Maven module to our test project.
Now we are ready to add the mail server as a Citrus component. Citrus is working with Spring so we need to add the mail server to the Spring application context. We add a new property to the Arquillian descriptor so the Citrus extension will load our new configuration:
The configuration class is a Spring Java configuration class in our project that adds the new mail server as Spring bean to the application context.
The configuration class must extend the Citrus base configuration class. This basic class adds all needed Spring beans for Citrus such as message validators, functions, validation matchers and so on. Important is our new mail server that uses the port 2222 and automatically starts with the Citrus application context. This is everything we need to do in order to add the mail server component to the Citrus runtime. We can add other Citrus endpoint components such as JMS endpoints, SOAP WebService servers and Camel endpoints here the same way. For now we are finished with the configuration and we can reference the mail server in our test case.
The Arquillian test case is basically the same as before in our first part example. The test now uses a @CitrusEndpoint annotated mail server component. The Arquillian Citrus extension will automatically inject the mail server Spring bean that we have added to the Citrus configuration before. In case multiple components of the same type are available in the configuration you can use the @CitrusEndpoint annotation with a Spring bean name like @CitrusEndpoint(name=”myMailServer”). We receive the mail message right after the test has called the service interface with the new employee Rajesh and a valid email field email@example.com. The mail server Citrus component is ready to be used in a receive test action. Citrus waits for the mail message to arrive and performs message validation with an expected mail message. Citrus automatically converts the mail mime message to a XML message representation. We can expect the mail message content much better using the XML syntax as we can use the powerful XML validation with XPath, ignore and validation matcher support.
In addition to that Citrus adds some special header values for explicit validation in the receive action. That completes the mail server test case. Citrus automatically start a SMTP server that receives the mail message. The mail is not sent to a real recipient we just want to validate the mail message content in our test. The mail server did automatically accept the authentication in default mode. We could also switch to advanced mode where we can also validate the authentication steps. For now we keep it simple and are happy to receive the mail message. Please note that we can mix the receive actions of different interfaces in Citrus very easy. Citrus acts both as client and server on our REST and mail interfaces in the test.
This should close the book for this post. You can review the example code on christophd@github. In a next post I will show you how we can execute the test as part of the test deployment on the application server. Then we have direct access to container managed resources such as JMS connection factories and queues. Once again, stay tuned!