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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.cartesian;
import static java.lang.String.format;
import static java.util.stream.Collectors.toList;
import static org.junit.platform.commons.support.AnnotationSupport.findAnnotation;
import static org.junitpioneer.internal.PioneerUtils.cartesianProduct;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
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.TestTemplateInvocationContext;
import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
import org.junit.jupiter.params.provider.ArgumentsSource;
import org.junit.jupiter.params.support.AnnotationConsumerInitializer;
import org.junit.platform.commons.PreconditionViolationException;
import org.junit.platform.commons.support.AnnotationSupport;
import org.junit.platform.commons.support.ReflectionSupport;
import org.junitpioneer.internal.PioneerAnnotationUtils;
import org.junitpioneer.internal.TestNameFormatter;
class CartesianTestExtension implements TestTemplateInvocationContextProvider {
@Override
public boolean supportsTestTemplate(ExtensionContext context) {
return findAnnotation(context.getTestMethod(), CartesianTest.class).isPresent();
}
@Override
public Stream provideTestTemplateInvocationContexts(ExtensionContext context) {
List> sets = computeSets(context);
TestNameFormatter formatter = createNameFormatter(context);
return cartesianProduct(sets).stream().map(params -> new CartesianTestInvocationContext(params, formatter));
}
private TestNameFormatter createNameFormatter(ExtensionContext context) {
CartesianTest annotation = findAnnotation(context.getRequiredTestMethod(), CartesianTest.class)
.orElseThrow(() -> new ExtensionConfigurationException("@CartesianTest not found."));
String pattern = annotation.name();
if (pattern.isEmpty())
throw new ExtensionConfigurationException("CartesianTest can not have an empty display name.");
String displayName = context.getDisplayName();
return new TestNameFormatter(pattern, displayName, CartesianTest.class);
}
private List> computeSets(ExtensionContext context) {
Method testMethod = context.getRequiredTestMethod();
List methodArgumentsSources = PioneerAnnotationUtils
.findMethodArgumentsSources(testMethod);
List parameterArgumentsSources = PioneerAnnotationUtils
.findParameterArgumentsSources(testMethod);
ensureNoInputConflicts(methodArgumentsSources, parameterArgumentsSources, testMethod);
if (!methodArgumentsSources.isEmpty())
return getSetsFromMethodArgumentsSource(methodArgumentsSources.get(0), context);
return getSetsFromArgumentsSources(parameterArgumentsSources, context);
}
private static void ensureNoInputConflicts(List methodSources, List parameterSources, Method testMethod) {
if (methodSources.isEmpty() && parameterSources.isEmpty() && testMethod.getParameters().length > 0)
throw new ExtensionConfigurationException("No arguments sources were found for @CartesianTest");
if (!methodSources.isEmpty() && !parameterSources.isEmpty())
throw new ExtensionConfigurationException(
"Providing both method-level and parameter-level argument sources for @CartesianTest is not supported.");
if (methodSources.size() > 1)
throw new ExtensionConfigurationException(
"Only one method-level arguments source can be used with @CartesianTest");
}
private List> getSetsFromMethodArgumentsSource(Annotation argumentsSource, ExtensionContext context) {
try {
CartesianMethodArgumentsProvider provider = initializeMethodArgumentsProvider(argumentsSource,
context.getRequiredTestMethod());
return provider.provideArguments(context).getArguments();
}
catch (Exception ex) {
throw new ExtensionConfigurationException("Could not provide arguments because of exception.", ex);
}
}
private List> getSetsFromArgumentsSources(List argumentsSources,
ExtensionContext context) {
List> sets = new ArrayList<>();
List parameters = Arrays.asList(context.getRequiredTestMethod().getParameters());
for (int i = 0; i < Math.min(parameters.size(), argumentsSources.size()); i++) {
sets.add(getSetFromAnnotation(context, argumentsSources.get(i), parameters.get(i)));
}
return sets;
}
private List getSetFromAnnotation(ExtensionContext context, Annotation source, Parameter parameter) {
try {
CartesianParameterArgumentsProvider provider = initializeParameterArgumentsProvider(source, parameter);
return provideArguments(context, parameter, provider);
}
catch (Exception ex) {
throw new ExtensionConfigurationException("Could not provide arguments because of exception.", ex);
}
}
private CartesianMethodArgumentsProvider initializeMethodArgumentsProvider(Annotation source, Method method) {
CartesianArgumentsSource providerAnnotation = AnnotationSupport
.findAnnotation(method, CartesianArgumentsSource.class)
// never happens, we already know these annotations are annotated with @ArgumentsSource
.orElseThrow(() -> new IllegalStateException(format(
"%s was not annotated with @CartesianArgumentsSource or @ArgumentsSource but should have been.",
source.annotationType())));
CartesianArgumentsProvider provider = ReflectionSupport.newInstance(providerAnnotation.value());
if (!(provider instanceof CartesianMethodArgumentsProvider))
throw new PreconditionViolationException(format("%s does not implement %s interface.", provider.getClass(),
CartesianMethodArgumentsProvider.class.getSimpleName()));
return AnnotationConsumerInitializer.initialize(method, (CartesianMethodArgumentsProvider) provider);
}
private CartesianParameterArgumentsProvider initializeParameterArgumentsProvider(Annotation source,
Parameter parameter) {
Class providerClass;
Optional cartesianProviderAnnotation = AnnotationSupport
.findAnnotation(parameter, CartesianArgumentsSource.class);
if (cartesianProviderAnnotation.isPresent()) {
providerClass = cartesianProviderAnnotation.get().value();
} else {
ArgumentsSource providerAnnotation = AnnotationSupport
.findAnnotation(parameter, ArgumentsSource.class)
.orElseThrow(() -> new IllegalStateException(
format("%s was not annotated with %s or %s but should have been.", source.annotationType(),
CartesianArgumentsSource.class.getName(), ArgumentsSource.class.getName())));
providerClass = providerAnnotation.value();
}
return getAndInitializeCartesianParameterArgumentsProvider(providerClass, parameter);
}
private static CartesianParameterArgumentsProvider getAndInitializeCartesianParameterArgumentsProvider(
Class providerClass, Parameter parameter) {
T provider = AnnotationConsumerInitializer.initialize(parameter, ReflectionSupport.newInstance(providerClass));
if (!(provider instanceof CartesianParameterArgumentsProvider)) {
throw new PreconditionViolationException(format("%s does not implement %s interface.", provider.getClass(),
CartesianParameterArgumentsProvider.class.getSimpleName()));
}
return (CartesianParameterArgumentsProvider) provider;
}
private List provideArguments(ExtensionContext context, Parameter source,
CartesianParameterArgumentsProvider provider) throws Exception {
return provider
.provideArguments(context, source)
.distinct()
// We like to keep arguments in the order in which they were listed
// in the annotation. Could use a set with defined iteration, but
// this is more explicit.
.collect(toList());
}
}
