# Tests

## Running Tests

To run the unit tests:

    $ mvn -Ptests test

Generating reports from unit tests:

    $ mvn install site

Running tests individually

    $ mvn -Ptests -DfailIfNoTests=false -Dtest=<test-name> test

where <test-name> is the name of the Test class without its package name

## Writing Tests

The broker is comprised of POJOs so it's simple to configure and run a broker instance and test particular functionality. Even complex test-cases involving multiple clustered brokers are relatively easy to write. Almost every test in the test-suite follows this pattern - configure broker, start broker, test functionality, stop broker.

The test-suite uses JUnit to manage test execution and life-cycle. Most tests extend `org.apache.activemq.artemis.tests.util.ActiveMQTestBase` which contains JUnit setup and tear-down methods as well as a wealth of utility functions to configure, start, manage, and stop brokers as well as perform other common tasks.

Check out `org.apache.activemq.artemis.tests.integration.SimpleTest`. It's a very simple test-case that extends `org.apache.activemq.artemis.tests.util.ActiveMQTestBase` and uses its methods to configure a server, run a test, and then `super.tearDown()` cleans it up once the test completes. The test-case includes comments to explain everything. As the name implies, this is a simple test-case that demonstrates the most basic functionality of the test-suite. A simple test like this takes less than a second to run on modern hardware.

Although `org.apache.activemq.artemis.tests.integration.SimpleTest` is simple it could be simpler still by extending `org.apache.activemq.artemis.tests.util.SingleServerTestBase`. This class does all the setup of a simple server automatically and provides the test-case with a `ServerLocator`, `ClientSessionFactory`, and `ClientSession` instance. `org.apache.activemq.artemis.tests.integration.SingleServerSimpleTest` is an example based on `org.apache.activemq.artemis.tests.integration.SimpleTest` but extends `org.apache.activemq.artemis.tests.util.SingleServerTestBase` which eliminates all the setup and class variables which are provided by `SingleServerTestBase` itself.

## Keys for writing good tests

### Avoid leaks

An important task for any test-case is to clean up all the resources it creates when it runs. This includes the server instance itself and any resources created to connect to it (e.g. instances of `ServerLocator`, `ClientSessionFactory`, `ClientSession`, etc.). This task is typically completed in the test's `tearDown()` method. However, `ActiveMQTestBase` (and other classes which extend it) simplifies this process. As `org.apache.activemq.artemis.tests.integration.SimpleTest` demonstrates, there are several methods you can use when creating your test which will ensure proper clean up automatically when the test is torn down. These include:

- All the overloaded `org.apache.activemq.artemis.tests.util.ActiveMQTestBase.createServer(..)` methods. If you choose not to use one of these methods to create your `ActiveMQServer` instance then use the `addServer(ActiveMQServer)` method to add the instance to the test-suite's internal resource ledger.
- Methods from `org.apache.activemq.artemis.tests.util.ActiveMQTestBase` to create a `ServerLocator` like `createInVMNonHALocator` and `createNettyNonHALocator`. If you choose not to use one of these methods then use `addServerLocator(ServerLocator)` to add the locator to the test-suite's internal resource ledger.
- `org.apache.activemq.artemis.tests.util.ActiveMQTestBase.createSessionFactory(ServerLocator)` for creating your session factory. If you choose not to use this method then use `org.apache.activemq.artemis.tests.util.ActiveMQTestBase.addSessionFactory` to add the factory to the test-suite's internal resource ledger.

### Create configurations

There are numerous methods in `org.apache.activemq.artemis.tests.util.ActiveMQTestBase` to create a configuration. These methods are named like create*Config(..). Each one creates a slightly different configuration but there is a lot of overlap between them.

In any case, `org.apache.activemq.artemis.core.config.Configuration` is a fluent interface so it's easy to customize however you need.

### Look at other test-cases

If you need ideas on how to configure something or test something try looking through the test-suite at other test-cases which may be similar. This is one of the best ways to learn how the test-suite works and how you can leverage the testing infrastructure to test your particular case.

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