Output WireMock logs through Slf4j (#27)

Fixes #26

wiremock-spring-boot/src/main/java/com/maciejwalkowiak/wiremock/spring/WireMockContextCustomizer.java

@@ -5,6 +5,7 @@
 import java.util.Objects;
 
 import com.github.tomakehurst.wiremock.WireMockServer;
+import com.github.tomakehurst.wiremock.common.Notifier;
 import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
 import org.junit.platform.commons.util.ReflectionUtils;
 import org.junit.platform.commons.util.StringUtils;
@@ -62,7 +63,8 @@ private void resolveOrCreateWireMockServer(ConfigurableApplicationContext contex
             // create & start wiremock server
             WireMockConfiguration serverOptions = options()
                     .usingFilesUnderClasspath(resolveStubLocation(options))
-                    .port(options.port());
+                    .port(options.port())
+                    .notifier(new Slf4jNotifier(true));
 
             if (options.extensions().length > 0) {
                 serverOptions.extensions(options.extensions());
@@ -130,4 +132,34 @@ public boolean equals(Object o) {
     public int hashCode() {
         return Objects.hash(configuration);
     }
+
+    // ported from: https://github.com/spring-cloud/spring-cloud-contract/commit/44c634d0e9e82515d2fba66343530eb7d2ba8223
+    static class Slf4jNotifier implements Notifier {
+
+        private static final Logger log = LoggerFactory.getLogger("WireMock");
+
+        private final boolean verbose;
+
+        Slf4jNotifier(boolean verbose) {
+            this.verbose = verbose;
+        }
+
+        @Override
+        public void info(String message) {
+            if (verbose) {
+                log.info(message);
+            }
+        }
+
+        @Override
+        public void error(String message) {
+            log.error(message);
+        }
+
+        @Override
+        public void error(String message, Throwable t) {
+            log.error(message, t);
+        }
+
+    }
 }

wiremock-spring-boot/src/test/java/com/maciejwalkowiak/wiremock/spring/WireMockConfigurationCustomizerTest.java

@@ -1,13 +1,25 @@
 package com.maciejwalkowiak.wiremock.spring;
 
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
 import com.github.tomakehurst.wiremock.WireMockServer;
 import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.system.CapturedOutput;
+import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.test.util.TestSocketUtils;
 
+import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
+import static com.github.tomakehurst.wiremock.client.WireMock.get;
+import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest(classes = WireMockConfigurationCustomizerTest.AppConfiguration.class)
@@ -23,6 +35,7 @@
                 configurationCustomizers = WireMockConfigurationCustomizerTest.SampleConfigurationCustomizer.class
         ),
 })
+@ExtendWith(OutputCaptureExtension.class)
 class WireMockConfigurationCustomizerTest {
     private static final int USER_SERVICE_PORT = TestSocketUtils.findAvailableTcpPort();
     private static final int TODO_SERVICE_PORT = TestSocketUtils.findAvailableTcpPort();
@@ -56,4 +69,19 @@ void appliesConfigurationCustomizer() {
         assertThat(todoService.port()).isEqualTo(TODO_SERVICE_PORT);
     }
 
+    @Test
+    void outputsWireMockLogs(CapturedOutput capturedOutput) throws IOException, InterruptedException {
+        userService.stubFor(get(urlEqualTo("/test"))
+                .willReturn(aResponse().withHeader("Content-Type", "text/plain").withBody("Hello World!")));
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpResponse<String> response = httpClient.send(
+                HttpRequest.newBuilder().GET().uri(URI.create("http://localhost:" + userService.port() + "/test")).build(),
+                HttpResponse.BodyHandlers.ofString());
+        assertThat(response.body()).isEqualTo("Hello World!");
+        assertThat(capturedOutput.getAll())
+                .as("Must contain debug logging for WireMock")
+                .contains("Matched response definition:");
+    }
+
 }