JUnit Annotations for vert.x

A JUnit Test Runner for vert.x and some utility annotations for launching integration tests.

Classpath Setup

IMPORTANT: The embedded vert.x instance will throw an exception if any of the verticles or modules you're testing are on the same classpath. This means that you must take care to ensure that the compile classpath for your application (if one exists) is not present in the integration test classpath.

Maven coordinates

The vertx-junit-annotations JAR is in Maven Central at the following coordinates (in Gradle form).

org.vert-x:vertx-junit-annotations:1.3.0.final

and in Maven form:

<dependency>
   <groupId>org.vert-x</groupId>
   <artifactId>vertx-junit-annotations</artifactId>
   <version>1.3.0.final</version>
   <scope>test</scope>
</dependency>

Source Code Layout

This utility is aimed at integration testing, rather than unit testing. For this reason and because of the classpath requirements described above, it is recommended that the source for your integration tests should be in a separate source path than the main and test code.

The following convention is recommended:

src/main/java
src/main/resources

src/test/java
src/test/resources

src/vertxInteg/java
src/vertxInteg/resources

This means that you can apply fine-grained control to the classpath and still perform unit tests on your code.

Test Configuration

Starting the vert.x node

Once you've added the JAR to your integration test classpath, you should annotate each test class with the @RunWith annotation, with the vert.x JUnit Class Runner implementation: VertxJUnit4ClassRunner.class.

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest {
  ...
}

To start a clustered vert.x node, set the port and hostname attributes of the @VertxConfiguration annotation. (The default value for 'hostname' is 'localhost'.)

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration(hostname="vert.x.org", port=10000)
public class SimpleVerticleTest {
  ...
}

Test class implementations

Implement VertxAware in your test class and VertxJUnit4ClassRunner will provide the same Vertx instance that is being used to start verticles and modules found in annotations:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest implements VertxAware {

  private Vertx vertx;

  @Override
  public void setVertx(Vertx vertx) {
    this.vertx = vertx;
  }
  ...
}

Implement VertxManagerAware to get the current VerticleManager:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest implements VertxManagerAware  {

  private VerticleManager manager;

  @Override
  public void setVerticleManager(VerticleManager manager) {
    this.manager = manager;
  }
  ...
}

Finally, extend VertxTestBase which implements both interfaces described above and some other utility methods:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest extends VertxTestBase  {
  ...
}

Launching

Testing a Verticle

You can annotate a class:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
@TestVerticle(main="test-verticle.js")
public class SimpleVerticleTest {
  ...
}

or you can annotate a method:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest {

  @Test
  @TestVerticle(main="test-verticle.js")
  public void doSomeTests() {}
  ...
}

If you annotate a class, the verticle starts before any other method is executed and is automatically stopped when the all of the tests in the class have finished.

A verticle started through an method annotation starts before the method is executed and is automatically stopped afterwards.

Testing a Module

Just like the @TestVerticle annotation, @TestModule can be placed on the class:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
@TestModule(name="vertx.example-v1.0")
public class SimpleVerticleTest {
  ...
}

and it can also annotate a method:

@RunWith(VertxJUnit4ClassRunner.class)
@VertxConfiguration
public class SimpleVerticleTest {

  @Test
  @TestModule(name="vertx.example-v1.0")
  public void doSomeTests() {}
  ...
}

Usage

See the Wiki for sample project builds.

See the projects own unit tests for many more examples!