To use WireMock with JUnit 4.x you use a @Rule statement to configure the WireMock server:

@Rule
public WireMockRule wireMockRule = new WireMockRule();

With JUnit 5, @Rule was replaced with extensions, so the equivalent setup looks like this:

@RegisterExtension
static WireMockExtension wm1 = WireMockExtension.newInstance()
    .options(options().port(8089))
    .build();

Testing Spring Boot 3 apps with JUnit 5 however gives the following error as Spring Boot 3 does not have Jetty 11 dependencies, so WireMock’s use of Jetty 11 fails to start:

com.github.tomakehurst.wiremock.common.FatalStartupException: Jetty 11 is not present and no suitable HttpServerFactory extension was found. Please ensure that the classpath includes a WireMock extension that provides an HttpServerFactory implementation. See http://wiremock.org/docs/extending-wiremock/ for more information.
at com.github.tomakehurst.wiremock.WireMockServer.lambda$getHttpServerFactory$2(WireMockServer.java:95)

Per the WireMock docs here, wiremock-spring-boot provides support using another approach. To use, add this dependency:

<dependency>
    <groupId>com.maciejwalkowiak.spring</groupId>
    <artifactId>wiremock-spring-boot</artifactId>
    <version>2.1.2</version>
    <scope>test</scope>
</dependency>

Enable for your test by adding @EnableWireMock:

@SpringBootTest
@EnableWireMock({
        @ConfigureWireMock(name = "your-mock-service", property = "your-url-to-mock.url")
})
class YourTest {
...
}

Inject the WireMock server into your test with:

@InjectWireMock("your-mock-service")
private WireMockServer wiremock;

@Value("${your-url-to-mock.url}")
private String wiremockUrl;

While this is a neat option to use with SpringBootTests, unfortunately it still doesn’t work with Spring Boot 3.3.x because of WireMock’s dependency on Jetty 11.

Tickets posted on the wiremock-spring-boot project suggest to avoid this in the meantime by using a dependency for wiremock-standalone instead:

        <dependency>
            <groupId>com.maciejwalkowiak.spring</groupId>
            <artifactId>wiremock-spring-boot</artifactId>
            <version>2.0.0</version>
            <scope>test</scope>
            <exclusions>                
                <exclusion>
                    <groupId>org.wiremock</groupId>
                    <artifactId>wiremock</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.wiremock</groupId>
            <artifactId>wiremock-standalone</artifactId>
            <version>3.3.1</version>
            <scope>test</scope>
        </dependency>

This works as expected.

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