How to replace WireMock @Rule annotation in JUnit 5?

How to replace WireMock @Rule annotation in JUnit 5?

In JUnit 5, the @Rule annotation used in JUnit 4 has been replaced with @ExtendWith and custom extensions. To replace WireMock's @Rule annotation in JUnit 5, you can create a custom extension that initializes and manages the WireMock server. Here's a step-by-step guide on how to do this:

  1. Add Dependencies: First, make sure you have the necessary dependencies in your project's build file. You will need JUnit 5 and WireMock dependencies. Here's an example for Gradle:

    dependencies { testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.0' testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.0' testImplementation 'com.github.tomakehurst:wiremock-jre8:2.39.1' }

    Or for Maven:

    <dependencies> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>5.8.0</version> <scope>test</scope> </dependency> <dependency> <groupId>com.github.tomakehurst</groupId> <artifactId>wiremock-jre8</artifactId> <version>2.39.1</version> <scope>test</scope> </dependency> </dependencies>

  2. Create a Custom Extension: Create a custom extension class that initializes the WireMock server and manages its lifecycle. Here's an example of a custom extension:

    import com.github.tomakehurst.wiremock.WireMockServer; import org.junit.jupiter.api.extension.AfterEachCallback; import org.junit.jupiter.api.extension.BeforeEachCallback; import org.junit.jupiter.api.extension.ExtensionContext; public class WireMockExtension implements BeforeEachCallback, AfterEachCallback { private WireMockServer wireMockServer; @Override public void beforeEach(ExtensionContext context) { wireMockServer = new WireMockServer(); wireMockServer.start(); } @Override public void afterEach(ExtensionContext context) { wireMockServer.stop(); } }

  3. Use the Custom Extension: Now, you can use the custom extension in your JUnit 5 test classes. Simply annotate your test class with @ExtendWith and specify the custom extension class:

    import org.junit.jupiter.api.Test; import org.junit.jupiter.api.extension.ExtendWith; @ExtendWith(WireMockExtension.class) public class YourWireMockTest { @Test void yourTest() { // Your test logic here, using WireMock } }

  4. Write Your WireMock Tests: In your test methods, you can interact with the WireMock server using the WireMock API as needed for your specific test cases.

By following these steps, you can replace the @Rule annotation from WireMock with a custom JUnit 5 extension, allowing you to manage the WireMock server's lifecycle within your tests.

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