| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * http://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.apache.cassandra; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| import org.junit.internal.builders.AllDefaultPossibilitiesBuilder; |
| import org.junit.runner.Description; |
| import org.junit.runner.Runner; |
| import org.junit.runner.notification.RunNotifier; |
| import org.junit.runners.BlockJUnit4ClassRunner; |
| import org.junit.runners.model.RunnerBuilder; |
| |
| /** |
| * This class comes useful when debugging flaky tests that will fail only when the full test suite is ran. It is |
| * intended for test failure investigation only. |
| * <p> |
| * Decorate your class with the runner and iterations you want. Defaults to 10. |
| * Beware of tests that change singleton status as those won't work. |
| * <pre>{@code |
| * @RunWith(RepeatableRunner.class) |
| * @RepeatableRunnerConfiguration(iterations = 2, runner = BlockJUnit4ClassRunner.class) |
| * public class MyTest |
| * { |
| * ... |
| * } |
| * }</pre> |
| */ |
| public class RepeatableRunner extends Runner |
| { |
| private static final int DEFAULT_REPETITIONS = 10; |
| private static final Class<? extends Runner> DEFAULT_RUNNER_CLASS = BlockJUnit4ClassRunner.class; |
| |
| private final Runner runner; |
| private final int iterations; |
| |
| public RepeatableRunner(Class<?> testClass) throws Throwable |
| { |
| Class<? extends Runner> runnerClass = DEFAULT_RUNNER_CLASS; |
| |
| if (testClass.isAnnotationPresent(RepeatableRunnerConfiguration.class)) |
| { |
| RepeatableRunnerConfiguration configuration = testClass.getAnnotation(RepeatableRunnerConfiguration.class); |
| iterations = configuration.iterations(); |
| runnerClass = configuration.runner(); |
| } |
| else |
| { |
| iterations = DEFAULT_REPETITIONS; |
| } |
| |
| runner = buildRunner(runnerClass, testClass); |
| } |
| |
| @Override |
| public Description getDescription() |
| { |
| return runner.getDescription(); |
| } |
| |
| @Override |
| public void run(RunNotifier notifier) |
| { |
| for (int i = 0; i < iterations; i++) |
| { |
| runner.run(notifier); |
| } |
| } |
| |
| private static Runner buildRunner(Class<? extends Runner> runnerClass, Class<?> testClass) throws Throwable |
| { |
| try |
| { |
| return runnerClass.getConstructor(Class.class).newInstance(testClass); |
| } |
| catch (NoSuchMethodException e) |
| { |
| return runnerClass.getConstructor(Class.class, RunnerBuilder.class) |
| .newInstance(testClass, new AllDefaultPossibilitiesBuilder(true)); |
| } |
| } |
| |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target(ElementType.TYPE) |
| public @interface RepeatableRunnerConfiguration |
| { |
| int iterations() default DEFAULT_REPETITIONS; |
| |
| Class<? extends Runner> runner() default BlockJUnit4ClassRunner.class; |
| } |
| } |