1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /*
19 * This is not the original file distributed by the Apache Software Foundation
20 * It has been modified by the Hipparchus project
21 */
22
23 package org.hipparchus;
24
25 import org.junit.runners.BlockJUnit4ClassRunner;
26 import org.junit.runners.model.FrameworkMethod;
27 import org.junit.runners.model.InitializationError;
28 import org.junit.runners.model.Statement;
29
30
31 /**
32 * A test runner that retries tests when assertions fail.
33 */
34 public class RetryRunner extends BlockJUnit4ClassRunner {
35 /**
36 * Simple constructor.
37 *
38 * @param testClass Class to test.
39 * @throws InitializationError if default runner cannot be built.
40 */
41 public RetryRunner(final Class<?> testClass)
42 throws InitializationError {
43 super(testClass);
44 }
45
46 @Override
47 public Statement methodInvoker(final FrameworkMethod method,
48 Object test) {
49 final Statement singleTryStatement = super.methodInvoker(method, test);
50 return new Statement() {
51 /**
52 * Evaluate the statement.
53 * We attempt several runs for the test, at most MAX_ATTEMPTS.
54 * if one attempt succeeds, we succeed, if all attempts fail, we
55 * fail with the reason corresponding to the last attempt
56 */
57 @Override
58 public void evaluate() throws Throwable {
59 Throwable failureReason = null;
60
61 final Retry retry = method.getAnnotation(Retry.class);
62 if (retry == null) {
63 // Do a single test run attempt.
64 singleTryStatement.evaluate();
65 } else {
66 final int numRetries = retry.value();
67
68 for (int i = 0; i < numRetries; ++i) {
69 try {
70 // Do a single test run attempt.
71 singleTryStatement.evaluate();
72 // Attempt succeeded, stop evaluation here.
73 return;
74 } catch (Throwable t) {
75 // Attempt failed, store the reason.
76 failureReason = t;
77 }
78 }
79
80 // All attempts failed.
81 throw failureReason;
82 }
83 }
84 };
85 }
86 }