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README.md

Testing Examples

A series of test cases that show techniques to test Spring Integration applications.

...chain.SpelChainTests.java

This test case shows how to test a fragment of a larger integration flow. In this example, we have a simple chain containing a header enricher and a transformer. It uses Direct channels. The test case shows how to bridge the output channel to a queue channel so we can retrieve the output message after the test executes and verify the appropriate actions were applied to the input message.

...splitter.CommaDelimitedSplitterTests.java

This test case shows both unit testing a custom splitter class as well as testing it within a Spring Integration flow fragment.

...aggregator.CommaDelimitedAggregatorTests.java

This test case shows both unit testing a custom aggregator class as well as testing it within a Spring Integration flow fragment.

...externalgateway.ExternalGatewaySubstitutionTests.java

This example is a little more complex. The application is a simplified version of a travel demo presented at SpringOne in 2010. You do not need to fully understand the application for the purposes of this demonstration. Suffice it to say that a zip (postal) code is sent to two outbound gateways (one web service, one http) and the weather and traffic for that zip code are aggregated together. You can run the "real" application by executing the Main class in src/main/java and entering a valid zip code in the console.

In many cases, when integrating with external services, we can't rely on those services being available while we test. Consequently, we need a mechanism to stub out those services so we can run the remainder of the flow in a repeatable manner without need for connectivity to the services. This example uses dummy service activators in place of the real outbound gateways.

This separation of 'infrastructure' from application beans is similar to the way we separate DataSource, ConnectionFactory beans etc so that the application can be tested with local versions.

...router.PetRouterTests.java

This test case shows both unit testing a custom router class as well as testing it within a Spring Integration flow fragment. A second filter is defined, that uses a discard channel for filtered messages.

...filter.PetFilterTests.java

This test case shows both unit testing a custom filter class as well as testing it within a Spring Integration flow fragment.

...gateway.GatewayTests.java

This test case shows how to verify that a has been configured to work as expected, including @Header parameters on the gateway method and elements in the configuration.

...errorhandling.GatewayTests.java

This test case shows how to verify that gateway error-channel configuration is correct, and show how to extract the cause and failed message from the MessagingException.