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/*
* Copyright (C) 2016, Matthias Sohn <matthias.sohn@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.junit;
import java.text.MessageFormat;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* {@link org.junit.rules.TestRule} which enables to run the same JUnit test
* repeatedly. Add this rule to the test class
*
* <pre>
* public class MyTest {
* @Rule
* public RepeatRule repeatRule = new RepeatRule();
* ...
* }
* </pre>
*
* and annotate the test to be repeated with the
* {@code @Repeat(n=<repetitions>)} annotation
*
* <pre>
* @Test
* @Repeat(n = 100)
* public void test() {
* ...
* }
* </pre>
*
* then this test will be repeated 100 times. If any test execution fails test
* repetition will be stopped.
*/
public class RepeatRule implements TestRule {
private static final Logger LOG = Logger
.getLogger(RepeatRule.class.getName());
/**
* Exception thrown if repeated execution of a test annotated with
* {@code @Repeat} failed.
*/
public static class RepeatedTestException extends RuntimeException {
private static final long serialVersionUID = 1L;
/**
* Constructor
*
* @param message
* the error message
* @since 5.1.9
*/
public RepeatedTestException(String message) {
super(message);
}
/**
* Constructor
*
* @param message
* the error message
* @param cause
* exception causing this exception
*/
public RepeatedTestException(String message, Throwable cause) {
super(message, cause);
}
}
private static class RepeatStatement extends Statement {
private final int repetitions;
private boolean abortOnFailure;
private final Statement statement;
private RepeatStatement(int repetitions, boolean abortOnFailure,
Statement statement) {
this.repetitions = repetitions;
this.abortOnFailure = abortOnFailure;
this.statement = statement;
}
@Override
public void evaluate() throws Throwable {
int failures = 0;
for (int i = 0; i < repetitions; i++) {
try {
statement.evaluate();
} catch (Throwable e) {
failures += 1;
RepeatedTestException ex = new RepeatedTestException(
MessageFormat.format(
"Repeated test failed when run for the {0}. time",
Integer.valueOf(i + 1)),
e);
LOG.log(Level.SEVERE, ex.getMessage(), ex);
if (abortOnFailure) {
throw ex;
}
}
}
if (failures > 0) {
RepeatedTestException e = new RepeatedTestException(
MessageFormat.format(
"Test failed {0} times out of {1} repeated executions",
Integer.valueOf(failures),
Integer.valueOf(repetitions)));
LOG.log(Level.SEVERE, e.getMessage(), e);
throw e;
}
}
}
@Override
public Statement apply(Statement statement, Description description) {
Statement result = statement;
Repeat repeat = description.getAnnotation(Repeat.class);
if (repeat != null) {
int n = repeat.n();
boolean abortOnFailure = repeat.abortOnFailure();
result = new RepeatStatement(n, abortOnFailure, statement);
}
return result;
}
}
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