Add support for nested tests annotated with JUnit 5's @nested

Fixes #10

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

@@ -1,11 +1,14 @@
 package com.maciejwalkowiak.wiremock.spring;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.test.context.ContextConfigurationAttributes;
 import org.springframework.test.context.ContextCustomizer;
 import org.springframework.test.context.ContextCustomizerFactory;
+import org.springframework.test.context.TestContextAnnotationUtils;
 
 /**
  * Creates {@link WireMockContextCustomizer} for test classes annotated with {@link EnableWireMock}.
@@ -16,12 +19,44 @@ public class WireMockContextCustomizerFactory implements ContextCustomizerFactor
     @Override
     public ContextCustomizer createContextCustomizer(Class<?> testClass,
             List<ContextConfigurationAttributes> configAttributes) {
-        EnableWireMock annotation = AnnotationUtils.findAnnotation(testClass, EnableWireMock.class);
+        // scan class and all enclosing classes if the test class is @Nested
+        ConfigureWiremockHolder holder = new ConfigureWiremockHolder();
+        parseDefinitions(testClass, holder);
 
-        if (annotation != null) {
-            return new WireMockContextCustomizer(annotation.value());
-        } else {
+        if (holder.isEmpty()) {
             return null;
+        } else {
+            return new WireMockContextCustomizer(holder.asArray());
+        }
+    }
+
+    private void parseDefinitions(Class<?> testClass, ConfigureWiremockHolder parser) {
+        parser.parse(testClass);
+        if (TestContextAnnotationUtils.searchEnclosingClass(testClass)) {
+            parseDefinitions(testClass.getEnclosingClass(), parser);
+        }
+    }
+
+    private static class ConfigureWiremockHolder {
+        private final List<ConfigureWireMock> annotations = new ArrayList<>();
+
+        void add(ConfigureWireMock[] annotations) {
+            this.annotations.addAll(Arrays.asList(annotations));
+        }
+
+        void parse(Class<?> clazz) {
+            EnableWireMock annotation = AnnotationUtils.findAnnotation(clazz, EnableWireMock.class);
+            if (annotation != null) {
+                add(annotation.value());
+            }
+        }
+
+        boolean isEmpty() {
+            return annotations.isEmpty();
+        }
+
+        ConfigureWireMock[] asArray() {
+            return annotations.toArray(new ConfigureWireMock[]{});
         }
     }
 }

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

@@ -1,7 +1,9 @@
 package com.maciejwalkowiak.wiremock.spring;
 
+import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
 import java.util.List;
+import java.util.function.Function;
 
 import com.github.tomakehurst.wiremock.WireMockServer;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
@@ -24,29 +26,21 @@ public void beforeEach(ExtensionContext extensionContext) throws Exception {
         Store.INSTANCE.findAllInstances(extensionContext).forEach(WireMockServer::resetAll);
 
         // inject properties into test class fields
-        injectWithLegacyWireMockAnnotation(extensionContext);
-        injectWireMockInstances(extensionContext);
+        injectWireMockInstances(extensionContext, WireMock.class, WireMock::value);
+        injectWireMockInstances(extensionContext, InjectWireMock.class, InjectWireMock::value);
     }
 
-    private static void injectWithLegacyWireMockAnnotation(ExtensionContext extensionContext) throws IllegalAccessException {
-        List<Field> annotatedFields = AnnotationSupport.findAnnotatedFields(extensionContext.getRequiredTestClass(), WireMock.class);
-        for (Field annotatedField : annotatedFields) {
-            WireMock annotation = annotatedField.getAnnotation(WireMock.class);
-            annotatedField.setAccessible(true);
-
-            WireMockServer wiremock = Store.INSTANCE.findRequiredWireMockInstance(extensionContext, annotation.value());
-            annotatedField.set(extensionContext.getRequiredTestInstance(), wiremock);
-        }
-    }
-
-    private static void injectWireMockInstances(ExtensionContext extensionContext) throws IllegalAccessException {
-        List<Field> annotatedFields = AnnotationSupport.findAnnotatedFields(extensionContext.getRequiredTestClass(), InjectWireMock.class);
-        for (Field annotatedField : annotatedFields) {
-            InjectWireMock annotation = annotatedField.getAnnotation(InjectWireMock.class);
-            annotatedField.setAccessible(true);
-
-            WireMockServer wiremock = Store.INSTANCE.findRequiredWireMockInstance(extensionContext, annotation.value());
-            annotatedField.set(extensionContext.getRequiredTestInstance(), wiremock);
+    private static <T extends Annotation> void injectWireMockInstances(ExtensionContext extensionContext, Class<T> annotation, Function<T, String> fn) throws IllegalAccessException {
+        // getRequiredTestInstances() return multiple instances for nested tests
+        for (Object testInstance : extensionContext.getRequiredTestInstances().getAllInstances()) {
+            List<Field> annotatedFields = AnnotationSupport.findAnnotatedFields(testInstance.getClass(), annotation);
+            for (Field annotatedField : annotatedFields) {
+                T annotationValue = annotatedField.getAnnotation(annotation);
+                annotatedField.setAccessible(true);
+
+                WireMockServer wiremock = Store.INSTANCE.findRequiredWireMockInstance(extensionContext, fn.apply(annotationValue));
+                annotatedField.set(testInstance, wiremock);
+            }
         }
     }
 

wiremock-spring-boot/src/test/java/app/NestedClassWireMockSpringExtensionTest.java

@@ -0,0 +1,80 @@
+package app;
+
+import com.github.tomakehurst.wiremock.WireMockServer;
+import com.maciejwalkowiak.wiremock.spring.ConfigureWireMock;
+import com.maciejwalkowiak.wiremock.spring.EnableWireMock;
+import com.maciejwalkowiak.wiremock.spring.InjectWireMock;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.core.env.Environment;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(classes = NestedClassWireMockSpringExtensionTest.AppConfiguration.class)
+@EnableWireMock({
+        @ConfigureWireMock(name = "user-service", property = "user-service.url"),
+        @ConfigureWireMock(name = "todo-service", property = "todo-service.url"),
+        @ConfigureWireMock(name = "noproperty-service")
+})
+public class NestedClassWireMockSpringExtensionTest {
+
+    @SpringBootApplication
+    static class AppConfiguration {
+    }
+
+    @Autowired
+    private Environment environment;
+
+    @InjectWireMock("todo-service")
+    private WireMockServer topLevelClassTodoService;
+
+    @Nested
+    @DisplayName("Test Something")
+    class NestedTest {
+
+        @InjectWireMock("todo-service")
+        private WireMockServer nestedClassTodoService;
+
+        @Test
+        void injectsWiremockServerToMethodParameter(@InjectWireMock("user-service") WireMockServer wireMockServer) {
+            assertWireMockServer(wireMockServer, "user-service.url");
+        }
+
+        @Test
+        void injectsWiremockServerToNestedClassField() {
+            assertWireMockServer(nestedClassTodoService, "todo-service.url");
+        }
+
+        @Test
+        void injectsWiremockServerToTopLevelClassField() {
+            assertWireMockServer(topLevelClassTodoService, "todo-service.url");
+        }
+
+        @Test
+        void doesNotSetPropertyWhenNotProvided(@InjectWireMock("noproperty-service") WireMockServer wireMockServer) {
+            assertThat(wireMockServer)
+                    .as("creates WireMock instance")
+                    .isNotNull();
+        }
+
+        private void assertWireMockServer(WireMockServer wireMockServer, String property) {
+            assertThat(wireMockServer)
+                    .as("creates WireMock instance")
+                    .isNotNull();
+            assertThat(wireMockServer.baseUrl())
+                    .as("WireMock baseUrl is set")
+                    .isNotNull();
+            assertThat(wireMockServer.port())
+                    .as("sets random port")
+                    .isNotZero();
+            assertThat(environment.getProperty(property))
+                    .as("sets Spring property")
+                    .isEqualTo(wireMockServer.baseUrl());
+        }
+    }
+}