Page History

...

1. Add dependencies on Camel-Spring, and the Spring test JAR (which will automatically bring in JUnit 3.8.x) to your POM:

   Code Block
   xml xml
   <dependency> <artifactId>camel-spring</artifactId> <groupId>org.apache.camel</groupId> <version>1.4.0</version> </dependency> <dependency> <artifactId>spring-test</artifactId> <groupId>org.springframework</groupId> <version>2.5.5</version> <scope>test</scope> </dependency>

2. Create a new unit test class in src/test/java/your-package-here, perhaps called XMLInputTest.java
3. Make the test extend Spring's AbstractJUnit38SpringContextTests class., so it can load a Spring context for the test
4. Create a Spring context configuration file in src/test/resources, perhaps called XMLInputTest-context.xml
5. In the unit test class, use the class-level @ContextConfiguration annotation to indicate that a Spring context should be loaded
   • By default, this looks for a Context configuration file called TestClassName-context.xml in a subdirectory corresponding to the package of the test class. For instance, if your test class was org.apache.camel.tutorial.XMLInputTest, it would look for org/apache/camel/tutorial/XMLInputTest-context.xml
   • To override this default, use the locations attribute on the @ContextConfiguration annotation to provide specific context file locations (starting each path with a / if you don't want it to be relative to the package directory). My solution does this so I can put the context file directly in src/test/resources instead of in a package directory under there.
6. Add a CamelContext instance variable to the test class, with the @Autowired annotation. That way Spring will automatically pull the CamelContext out of the Spring context and inject it into our test class.
7. Add a ProducerTemplate instance variable and a setUp method that instantiates it from the CamelContext. We'll use the ProducerTemplate later to send messages to the route.

   Code Block
   java java
   protected ProducerTemplate<Exchange> template; protected void setUp() throws Exception { super.setUp(); template = camelContext.createProducerTemplate(); }

8. Put in an empty test method just for the moment (so when we run this we can see that "1 test succeeded")
9. Add the Spring <beans> element (including the Camel Namespace) with an empty <camelContext> element to the Spring context, like this:

   Code Block
   xml xml
   <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://activemq.apache.org/camel/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring-1.4.0.xsd"> <camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring"> </camelContext> </beans>

Test it by running mvn install and make sure there are no build errors. So far it doesn't test much; just that your project and test and source files are all organized correctly, and the one empty test method completes successfully.

Solution: Your test class might look something like this:

...

1. Save the input-customer1.xml file to src/test/resources
2. Save your XSLT file (created in the previous step) to src/main/resources
3. Write a Camel Route, either right in the Spring XML, or using the Java DSL (in another class under src/test/java somewhere). This route should use the Pipes and Filters integration pattern to:
   1. Start from the endpoint direct:start (which lets the test conveniently pass messages into the route)
   2. Call the endpoint xslt:YourXSLTFile.xsl (to transform the message with the specified XSLT template)
   3. Send the result to the endpoint mock:finish (which lets the test verify the route output)
4. Add a test method to the unit test class that:
   1. Get a reference to the Mock endpoint mock:finish using code like this:

      Code Block
      java java
      MockEndpoint finish = MockEndpoint.resolve(camelContext, "mock:finish");

   2. Set the expectedMessageCount on that endpoint to 1
   3. Get a reference to the Customer 1 input file, using code like this:

      Code Block
      java java
      InputStream in = XMLInputTest.class.getResourceAsStream("/input-partner1.xml"); assertNotNull(in);

   4. Send that InputStream as a message to the direct:start endpoint, using code like this:

      Code Block
      java java
      template.sendBody("direct:start", in);

      Note that we can send the sample file body in several formats (File, InputStream, String, etc.) but in this case an InputStream is pretty convenient.
   5. Ensure that the message made it through the route to the final endpoint, by testing all configured Mock endpoints like this:

      Code Block
      java java
      MockEndpoint.assertIsSatisfied(camelContext);

   6. If you like, inspect the final message body using some code like finish.getExchanges().get(0).getIn().getBody().
      • If you do this, you'll need to know what format that body is – String, byte array, InputStream, etc.
5. Run your test with mvn install and make sure the build completes successfully.

...

• src/test/java/org/apache/camel/tutorial/XMLInputTest.java
• For XML Configuration:
  • src/test/resources/XMLInputTest-context.xml
• For Or, for Java DSL Configuration:
  • src/test/resources/XMLInputTest-dsl-context.xml
  • src/test/java/org/apache/camel/tutorial/routes/XMLInputTestRoute.java

...