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As a simple alternative to using CDI Testing, Spring Testing or Guice the camel-test module was introduced so you can perform powerful Testing of your Enterprise Integration Patterns easily.
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The camel-test JAR is using JUnit. There is an alternative camel-testng JAR (from Camel 2.8
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) using the TestNG test framework.
Adding to your your pom.xml
To get started using Camel Test you will need to add an entry to your pom.xml:
JUnit
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TestNG
Available as of Camel 2.8
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You might also want to add add slf4j and and log4j to ensure nice logging messages (and maybe adding a log4j.properties file into your your src/test/resources directory).
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Writing your test
You firstly need to derive from the class class CamelTestSupport (org.apache.camel.test.CamelTestSupport, org.apache.camel.test.junit4.CamelTestSupport, or or org.apache.camel.testng.CamelTestSupport for JUnit 3.x, JUnit 4.x, and TestNG, respectively) and typically you will need to override the the createRouteBuilder() or or createRouteBuilders() method method to create routes to be tested.
Here is an example.
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Notice Note: how you can use the various Camel binding and injection annotations to inject individual Endpoint objects - particularly the Mock endpoints which are very useful for Testing. Also you can inject producer objects such as ProducerTemplate or some application code interface for sending messages or invoking services.
Features Provided by by CamelTestSupport
The various various CamelTestSupport classes provide a standard set of behaviors relating to the the CamelContext used to host the route(s) under test. The classes provide a number of methods that allow a test to alter the configuration of the the CamelContext used. The following table describes the available customization methods and the default behavior of tests that are built from a CamelTestSupport class.
Method Name | Description | Default Behavior | |
|---|---|---|---|
| If the route builders returned from returned from either | Returns
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| If the the
Info | Its important to start the | Returns The the |
| See Setup CamelContext once per class, or per every test method. | The The | |
| Triggers the auto-mocking of endpoints whose URIs match the provided filter. The default filter is is Return See | Disabled | |
| If this method returns
methods are invoked for each processor in the registered routes. | Disabled The . The methods are not invoked during the test. | |
| Returns the number of seconds that Camel should wait for graceful shutdown. Useful Useful for decreasing test times when a message is still in flight at the end of the test. | Returns 10 seconds. | |
| If JMX should be disabled on the the | JMX is disabled. | |
| Provides a hook for adding objects into the registry. Override this method to bind objects to the registry before test methods are invoked. | An empty registry is initialized. | |
| Camel 2.10: Allows to add/override properties when Using PropertyPlaceholder in Camel. |
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| Camel 2.10: Allows to control if Camel should ignore missing locations for properties. |
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| Camel 2.16: If enabled, then Camel will dump all route coverage statistics into XML files in the target/camel-route- statscoverage directory. These XML files contains information about "route coverage" of all the routes that was used during the unit test. This allows tooling to inspect these XML files and generate nice route coverage reports. | Disabled. |
JNDI
Camel uses a Registry to allow you to configure Component or Endpoint instances or Beans used in your routes. If you are not using Spring or OSGi then JNDI is used as the default registry implementation.
So you will also need to create a a jndi.properties file in your your src/test/resources directory so that there is a default registry available to initialise initialize the CamelContext.
Here is an example jndi.properties file
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Dynamically Assigning Ports
Available as of Camel 2.7
Tests that use port numbers will fail if that port is already on use. AvailablePortFinder provides methods for finding unused port numbers at runtimerun time.
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Setup CamelContext once per class, or per every test method
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The Camel Test kit will by default setup and shutdown CamelContext per every test method in your test class. So for example if you have 3 test methods, then CamelContext is started and shutdown after each test, that is 3 times.
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This feature is also supported
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in camel-testng
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When using this the CamelContext will keep state between tests, so have that in mind. So if your unit tests start to fail for no apparent reason, it could be due this fact. So use this feature with a bit of care.
You may want to do this once, to share the CamelContext between test methods, to speedup unit testing. This requires to the use of JUnit 4! In your unit test method you have to extend the org.apache.camel.test.junit4.CamelTestSupport or the org.apache.camel.test.junit4.CamelSpringTestSupport test class and override the isCreateCamelContextPerClass method and return true as shown in the following example:
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See Also
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