Add SpringTestContextExtension

config/src/test/java/org/springframework/security/config/test/SpringTestContextExtension.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2002-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.config.test;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+import org.springframework.security.test.context.TestSecurityContextHolder;
+
+public class SpringTestContextExtension implements BeforeEachCallback, AfterEachCallback {
+
+	@Override
+	public void afterEach(ExtensionContext context) throws Exception {
+		TestSecurityContextHolder.clearContext();
+		getContexts(context.getRequiredTestInstance()).forEach((springTestContext) -> springTestContext.close());
+	}
+
+	@Override
+	public void beforeEach(ExtensionContext context) throws Exception {
+		Object testInstance = context.getRequiredTestInstance();
+		getContexts(testInstance).forEach((springTestContext) -> springTestContext.setTest(testInstance));
+	}
+
+	private static List<SpringTestContext> getContexts(Object test) throws IllegalAccessException {
+		Field[] declaredFields = test.getClass().getDeclaredFields();
+		List<SpringTestContext> result = new ArrayList<>();
+		for (Field field : declaredFields) {
+			if (SpringTestContext.class.isAssignableFrom(field.getType())) {
+				result.add((SpringTestContext) field.get(test));
+			}
+		}
+		return result;
+	}
+
+}