/*
* 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.commons.math3;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
/**
* A test runner that retries tests when assertions fail.
*/
public class RetryRunner extends BlockJUnit4ClassRunner {
/**
* Simple constructor.
*
* @param testClass Class to test.
* @throws InitializationError if default runner cannot be built.
*/
public RetryRunner(final Class<?> testClass)
throws InitializationError {
super(testClass);
}
@Override
public Statement methodInvoker(final FrameworkMethod method,
Object test) {
final Statement singleTryStatement = super.methodInvoker(method, test);
return new Statement() {
/**
* Evaluate the statement.
* We attempt several runs for the test, at most MAX_ATTEMPTS.
* if one attempt succeeds, we succeed, if all attempts fail, we
* fail with the reason corresponding to the last attempt
*/
@Override
public void evaluate() throws Throwable {
Throwable failureReason = null;
final Retry retry = method.getAnnotation(Retry.class);
if (retry == null) {
// Do a single test run attempt.
singleTryStatement.evaluate();
} else {
final int numRetries = retry.value();
for (int i = 0; i < numRetries; ++i) {
try {
// Do a single test run attempt.
singleTryStatement.evaluate();
// Attempt succeeded, stop evaluation here.
return;
} catch (Throwable t) {
// Attempt failed, store the reason.
failureReason = t;
}
}
// All attempts failed.
throw failureReason;
}
}
};
}
}