README.MD

Module gcp-pubsub-test

Testing module build on top of testcontainers for Gcp PubSub exist out of a single type PubSubEmulator, it implements AutoCloseable, and Startable for the underlying testcontainers.

In addition to ExternalResource such that you can easily use it with JUnit's ClassRule and Rule, and it's also a Ktor Plugin such that you can easily install it in your testApplication and all configuration is done for you.

class GcpPluginTest {
  val projectId = ProjectId("my-project-id")

  @Test
  fun emulatorTest() = runBlocking(Default) {
    val topic = emulator.uniqueTopic()
    val subscription = emulator.uniqueSubscription()
    val messages = (1..3).map { "$it" }
    val channel = Channel<String>(3)
    
    testApplication {
      install(emulator)
      
      application {
        pubSub(projectId) {
          createTopic(topic)
          createSubscription(subscription, topic)
          launch { publish(topic, messages) }
          
          subscribe(subscription) { record ->
            record.ack().await()
            channel.send(record.message.data.toStringUtf8())
          }
        }
      }.also { startApplication() }
      
      assertEquals(messages.toSet(), channel.consumeAsFlow().take(3).toSet())
    }
  }
  
  companion object {
    @JvmStatic
    @get:ClassRule
    val emulator = PubSubEmulator()
  }
}

Using in your projects

Gradle

Add dependencies (you can also add other modules that you need):

dependencies {
  testImplementation("io.github.nomisrev:gcp-pubsub-test:1.0.0")
}

Maven

Add dependencies (you can also add other modules that you need):

<dependency>
    <groupId>io.github.nomisrev</groupId>
    <artifactId>gcp-pubsub-test</artifactId>
    <version>1.0.0</version>
    <scope>test</scope>
</dependency>