For writing Pact verification tests with JUnit 5, there is an JUnit 5 Invocation Context Provider that you can use with
the @TestTemplate
annotation. This will generate a test for each interaction found for the pact files for the provider.
To use it, add the @Provider
and one of the pact source annotations to your test class (as per a JUnit 4 test), then
add a method annotated with @TestTemplate
and @ExtendWith(PactVerificationInvocationContextProvider.class)
that
takes a PactVerificationContext
parameter. You will need to call verifyInteraction()
on the context parameter in
your test template method.
For example:
@Provider("myAwesomeService")
@PactFolder("pacts")
public class ContractVerificationTest {
@TestTemplate
@ExtendWith(PactVerificationInvocationContextProvider.class)
void pactVerificationTestTemplate(PactVerificationContext context) {
context.verifyInteraction();
}
}
For details on the provider and pact source annotations, refer to the Pact junit runner docs.
You can set the test target (the object that defines the target of the test, which should point to your provider) on the
PactVerificationContext
, but you need to do this in a before test method (annotated with @BeforeEach
). There are three
different test targets you can use: HttpTestTarget
, HttpsTestTarget
and AmpqTestTarget
.
For example:
@BeforeEach
void before(PactVerificationContext context) {
context.setTarget(HttpTestTarget.fromUrl(new URL(myProviderUrl)));
// or something like
// context.setTarget(new HttpTestTarget("localhost", myProviderPort, "/"));
}
Note for Maven users: If you use Maven to run your tests, you will have to make sure that the Maven Surefire plugin is at least version 2.22.1 uses an isolated classpath.
For example, configure it by adding the following to your POM:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
<configuration>
<useSystemClassLoader>false</useSystemClassLoader>
</configuration>
</plugin>
Provider State Methods work in the same way as with JUnit 4 tests, refer to the Pact junit runner docs.
If you have a large number of state change methods, you can split things up by moving them to other classes. You will
need to specify the additional classes on the test context in a Before
method. Do this with the withStateHandler
or setStateHandlers
methods. See StateAnnotationsOnAdditionalClassTest for an example.
Important Note: You should only use this feature for things that can not be persisted in the pact file. By modifying the request, you are potentially modifying the contract from the consumer tests!
Sometimes you may need to add things to the requests that can't be persisted in a pact file. Examples of these would be
authentication tokens, which have a small life span. The Http and Https test targets support injecting the request that
will executed into the test template method.
You can then add things to the request before calling the verifyInteraction()
method.
For example to add a header:
@TestTemplate
@ExtendWith(PactVerificationInvocationContextProvider.class)
void testTemplate(PactVerificationContext context, HttpRequest request) {
// This will add a header to the request
request.addHeader("X-Auth-Token", "1234");
context.verifyInteraction();
}
You can inject the following objects into your test methods (just like the PactVerificationContext
). They will be null if injected before the
supported phase.
Object | Can be injected from phase | Description |
---|---|---|
PactVerificationContext | @BeforeEach | The context to use to execute the interaction test |
Pact | any | The Pact model for the test |
Interaction | any | The Interaction model for the test |
HttpRequest | @TestTemplate | The request that is going to be executed (only for HTTP and HTTPS targets) |
ProviderVerifier | @TestTemplate | The verifier instance that is used to verify the interaction |
By default, the test will fail with an exception if no pacts were found to verify. This can be overridden by adding the
@IgnoreNoPactsToVerify
annotation to the test class. For this to work, you test class will need to be able to receive
null values for any of the injected parameters.
If your Pact broker supports pending pacts, you can enable support for that by enabling that on your Pact broker annotation or with JVM system properties. You also need to provide the tags used to publish the providers main-line results (i.e. tags like prod or master). The broker will then label any pacts found that don't have a successful verification result as pending. That way, if they fail verification, the verifier will ignore those failures and not fail the build.
For example, with annotation:
@Provider("Activity Service")
@PactBroker(host = "test.pactflow.io", tags = {"test"}, scheme = "https",
enablePendingPacts = "true",
providerTags = "master"
)
public class PactJUnitTest {
You can also use the pactbroker.enablePending
and pactbroker.providerTags
JVM system properties.
Then any pending pacts will not cause a build failure.