sample-hamcrest

Hamcrest matcher sample

This sample shows how to use Hamcrest matcher in validation steps. Read about this feature in reference guide

Objectives

The todo-list sample application provides a REST API for managing todo entries. We call this API and receive Json message structures for validation in our test cases.

This time the validation is done using Hamcrest matcher implementations in combination with JsonPath expression evaluation.

http()
    .client(todoClient)
    .receive()
    .response(HttpStatus.OK)
    .messageType(MessageType.JSON)
    .validate("$.keySet()", hasItems("id", "title", "description", "done"))
    .validate("$.id", equalTo(todoId))
    .validate("$.title", allOf(startsWith("todo_"), endsWith(todoId)))
    .validate("$.description", anyOf(startsWith("Description:"), nullValue()))
    .validate("$.done", not(true));

As you can see we are able to provide Hamcrest matcher instances as expected JsonPath value. The hamcrest matcher is evaluated with the JsonPath expression result. This way we can construct more complex validations on JsonPath expressions.

Also we can use Hamcrest matcher as condition evaluation when using iterable containers in Citrus:

@Test
@CitrusTest
public void testHamcrestCondition() {
    iterate()
        .condition(lessThanOrEqualTo(5))
        .actions(
            createVariable("todoId", "citrus:randomUUID()"),
            createVariable("todoName", "todo_${i}"),
            createVariable("todoDescription", "Description: ${todoName}"),
            http()
                .client(todoClient)
                .send()
                .post("/api/todolist")
                .messageType(MessageType.JSON)
                .contentType(ContentType.APPLICATION_JSON.getMimeType())
                .payload("{ \"id\": \"${todoId}\", \"title\": \"${todoName}\", \"description\": \"${todoDescription}\", \"done\": false}"),

            http()
                .client(todoClient)
                .receive()
                .response(HttpStatus.OK)
                .messageType(MessageType.PLAINTEXT)
                .payload("${todoId}")
    );
}

The iteration condition uses the lessThanOrEqualTo Hamcrest matcher in order to evaluate the end of the iteration loop. This time we choose to execute the nested test action sequence five times.

Run

NOTE: This test depends on the todo-app WAR which must have been installed into your local maven repository using mvn clean install beforehand.

The sample application uses Maven as build tool. So you can compile, package and test the sample with Maven.

 mvn clean verify -Dembedded

This executes the complete Maven build lifecycle. The embedded option automatically starts a Jetty web container before the integration test phase. The todo-list system under test is automatically deployed in this phase. After that the Citrus test cases are able to interact with the todo-list application in the integration test phase.

During the build you will see Citrus performing some integration tests. After the tests are finished the embedded Jetty web container and the todo-list application are automatically stopped.

System under test

The sample uses a small todo list application as system under test. The application is a web application that you can deploy on any web container. You can find the todo-list sources here. Up to now we have started an embedded Jetty web container with automatic deployments during the Maven build lifecycle. This approach is fantastic when running automated tests in a continuous build.

Unfortunately the Jetty server and the sample application automatically get stopped when the Maven build is finished. There may be times we want to test against a standalone todo-list application.

You can start the sample todo list application in Jetty with this command.

 mvn jetty:run

This starts the Jetty web container and automatically deploys the todo list app. Point your browser to

http://localhost:8080/todolist/

You will see the web UI of the todo list and add some new todo entries.

Now we are ready to execute some Citrus tests in a separate JVM.

Citrus test

Once the sample application is deployed and running you can execute the Citrus test cases. Open a separate command line terminal and navigate to the sample folder.

Execute all Citrus tests by calling

 mvn verify

You can also pick a single test by calling

 mvn verify -Dit.test=<testname>

You should see Citrus performing several tests with lots of debugging output in both terminals (sample application server and Citrus test client). And of course green tests at the very end of the build.

Of course you can also start the Citrus tests from your favorite IDE. Just start the Citrus test using the TestNG IDE integration in IntelliJ, Eclipse or Netbeans.

Further information

For more information on Citrus see www.citrusframework.org, including a complete reference manual.