Kotlin for Enterprise Applications using Java EE

Writing a test case for the publish-subscribe model

Let's write test cases to check the publishMessage() and listenToMessage() functions. 

We can write a PublisherTest as follows:

class PublisherTest {    @Test    fun testPublishMessage() {        val seContainerInitializer = SeContainerInitializer.newInstance()        val seContainer = seContainerInitializer.initialize()        val publisherInstance = seContainer.select(Publisher::class.java)        val publisher = publisherInstance.get()        Assert.assertNotNull(publisher)        val message = "Test messgage for topic111"        publisher.publishMessage(message)    }}

We initialize the container to inject the dependencies. We get an instance of Publisher and invoke the publishMessage() function by passing the message. This message will be published ...