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/*
* Copyright 2016-2022 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* http://www.eclipse.org/legal/epl-v20.html
*/
package org.junitpioneer.jupiter;
import static java.lang.String.format;
import static java.util.Spliterator.ORDERED;
import static java.util.Spliterators.spliteratorUnknownSize;
import static java.util.stream.StreamSupport.stream;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;
import org.junit.jupiter.api.extension.ExtensionConfigurationException;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
import org.junit.jupiter.api.extension.TestExecutionExceptionHandler;
import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
import org.junit.platform.commons.support.AnnotationSupport;
import org.junitpioneer.internal.PioneerAnnotationUtils;
import org.junitpioneer.internal.TestNameFormatter;
import org.opentest4j.AssertionFailedError;
import org.opentest4j.TestAbortedException;
class RetryingTestExtension implements TestTemplateInvocationContextProvider, TestExecutionExceptionHandler {
private static final Namespace NAMESPACE = Namespace.create(RetryingTestExtension.class);
@Override
public boolean supportsTestTemplate(ExtensionContext context) {
// the annotation only applies to methods (see its `@Target`),
// so it doesn't matter that this method checks meta-annotations
return PioneerAnnotationUtils.isAnnotationPresent(context, RetryingTest.class);
}
@Override
public Stream provideTestTemplateInvocationContexts(ExtensionContext context) {
FailedTestRetrier retrier = retrierFor(context);
return stream(spliteratorUnknownSize(retrier, ORDERED), false);
}
@Override
public void handleTestExecutionException(ExtensionContext context, Throwable throwable) throws Throwable {
// this `context` (M) is a child of the context passed to `provideTestTemplateInvocationContexts` (T),
// which means M's store content is invisible to T's store; this can be fixed by using T's store here
ExtensionContext templateContext = context
.getParent()
.orElseThrow(() -> new IllegalStateException(
"Extension context \"" + context + "\" should have a parent context."));
retrierFor(templateContext).failed(throwable);
}
private static FailedTestRetrier retrierFor(ExtensionContext context) {
Method test = context.getRequiredTestMethod();
return context
.getStore(NAMESPACE)
.getOrComputeIfAbsent(test.toString(), __ -> FailedTestRetrier.createFor(test, context),
FailedTestRetrier.class);
}
private static class FailedTestRetrier implements Iterator {
private final int maxRetries;
private final int minSuccess;
private final int suspendForMs;
private final Class[] expectedExceptions;
private final TestNameFormatter formatter;
private int retriesSoFar;
private int exceptionsSoFar;
private boolean seenFailedAssumption;
private boolean seenUnexpectedException;
private FailedTestRetrier(int maxRetries, int minSuccess, int suspendForMs,
Class[] expectedExceptions, TestNameFormatter formatter) {
this.maxRetries = maxRetries;
this.minSuccess = minSuccess;
this.suspendForMs = suspendForMs;
this.expectedExceptions = expectedExceptions;
this.retriesSoFar = 0;
this.exceptionsSoFar = 0;
this.formatter = formatter;
}
static FailedTestRetrier createFor(Method test, ExtensionContext context) {
RetryingTest retryingTest = AnnotationSupport
.findAnnotation(test, RetryingTest.class)
.orElseThrow(() -> new IllegalStateException("@RetryingTest is missing."));
int maxAttempts = retryingTest.maxAttempts() != 0 ? retryingTest.maxAttempts() : retryingTest.value();
int minSuccess = retryingTest.minSuccess();
String pattern = retryingTest.name();
if (maxAttempts == 0)
throw new ExtensionConfigurationException(
"@RetryingTest requires that one of `value` or `maxAttempts` be set.");
if (retryingTest.value() != 0 && retryingTest.maxAttempts() != 0)
throw new ExtensionConfigurationException(
"@RetryingTest requires that one of `value` or `maxAttempts` be set, but not both.");
if (minSuccess < 1)
throw new ExtensionConfigurationException(
"@RetryingTest requires that `minSuccess` be greater than or equal to 1.");
else if (maxAttempts <= minSuccess) {
String additionalMessage = maxAttempts == minSuccess
? " Using @RepeatedTest is recommended as a replacement."
: "";
throw new ExtensionConfigurationException(
format("@RetryingTest requires that `maxAttempts` be greater than %s.%s",
minSuccess == 1 ? "1" : "`minSuccess`", additionalMessage));
}
if (pattern.isEmpty())
throw new ExtensionConfigurationException("RetryingTest can not have an empty display name.");
String displayName = context.getDisplayName();
TestNameFormatter formatter = new TestNameFormatter(pattern, displayName, RetryingTest.class);
if (retryingTest.suspendForMs() < 0) {
throw new ExtensionConfigurationException(
"@RetryingTest requires that `suspendForMs` be greater than or equal to 0.");
}
return new FailedTestRetrier(maxAttempts, minSuccess, retryingTest.suspendForMs(),
retryingTest.onExceptions(), formatter);
}
void failed(E exception) throws E {
exceptionsSoFar++;
if (exception instanceof TestAbortedException) {
seenFailedAssumption = true;
throw new TestAbortedException("Test execution was skipped, possibly because of a failed assumption.",
exception);
}
if (!expectedException(exception)) {
seenUnexpectedException = true;
throw exception;
}
if (hasNext())
throw new TestAbortedException(
format("Test execution #%d (of up to %d) failed ~> will retry in %d ms...", retriesSoFar,
maxRetries, suspendForMs),
exception);
else
throw new AssertionFailedError(format(
"Test execution #%d (of up to %d with at least %d successes) failed ~> test fails - see cause for details",
retriesSoFar, maxRetries, minSuccess), exception);
}
private boolean expectedException(Throwable exception) {
// if not expected exceptions were specified, all are expected
if (expectedExceptions.length == 0)
return true;
return Arrays.stream(expectedExceptions).anyMatch(type -> type.isInstance(exception));
}
private void suspendFor(int millis) {
if (millis < 1) {
return;
}
try {
TimeUnit.MILLISECONDS.sleep(millis);
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Thread interrupted during retry suspension.", ex);
}
}
private boolean isFirstExecution() {
return retriesSoFar == 0;
}
@Override
public boolean hasNext() {
// there's always at least one execution
if (isFirstExecution())
return true;
if (seenFailedAssumption || seenUnexpectedException)
return false;
int successfulExecutionCount = retriesSoFar - exceptionsSoFar;
int remainingExecutionCount = maxRetries - retriesSoFar;
int requiredSuccessCount = minSuccess - successfulExecutionCount;
return remainingExecutionCount >= requiredSuccessCount && requiredSuccessCount > 0;
}
@Override
public RetryingTestInvocationContext next() {
if (!hasNext())
throw new NoSuchElementException();
if (!isFirstExecution()) {
suspendFor(suspendForMs);
}
retriesSoFar++;
return new RetryingTestInvocationContext(formatter);
}
}
}
