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/*
* Copyright 2021 Google Inc.
*
* Licensed 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 com.google.testing.junit.testparameterinjector.junit5;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.Iterables.getOnlyElement;
import com.google.auto.value.AutoValue;
import com.google.auto.value.extension.memoized.Memoized;
import com.google.common.collect.ImmutableList;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.List;
import java.util.stream.Stream;
import org.junit.jupiter.api.extension.Extension;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolver;
import org.junit.jupiter.api.extension.TestInstancePostProcessor;
import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
/** Implements the TestParameterInjector logic for JUnit5 (Jupiter). */
class TestParameterInjectorExtension implements TestTemplateInvocationContextProvider {
private static final TestMethodProcessorList testMethodProcessors =
TestMethodProcessorList.createNewParameterizedProcessors();
@Override
public boolean supportsTestTemplate(ExtensionContext context) {
return true;
}
@Override
public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContexts(
ExtensionContext extensionContext) {
validateTestMethodAndConstructor(
extensionContext.getRequiredTestMethod(), extensionContext.getRequiredTestClass());
List<TestInfo> testInfos =
testMethodProcessors.calculateTestInfos(
extensionContext.getRequiredTestMethod(), extensionContext.getRequiredTestClass());
return testInfos.stream().map(CustomInvocationContext::of);
}
private void validateTestMethodAndConstructor(Method testMethod, Class<?> testClass) {
checkState(
testClass.getDeclaredConstructors().length == 1,
"Only a single constructor is allowed, but found %s in %s",
testClass.getDeclaredConstructors().length,
testClass.getSimpleName());
Constructor<?> constructor =
getOnlyElement(ImmutableList.copyOf(testClass.getDeclaredConstructors()));
testMethodProcessors.validateConstructor(constructor).assertValid();
testMethodProcessors.validateTestMethod(testMethod, testClass).assertValid();
checkState(
testMethod.getAnnotation(TestParameterInjectorTest.class) != null,
"Each test method handled by this extension should be annotated with"
+ " @TestParameterInjectorTest");
}
@AutoValue
abstract static class CustomInvocationContext implements TestTemplateInvocationContext {
abstract TestInfo testInfo();
@Memoized
List<Object> getConstructorParameters() {
Constructor<?> constructor =
getOnlyElement(ImmutableList.copyOf(testInfo().getTestClass().getDeclaredConstructors()));
return testMethodProcessors.getConstructorParameters(constructor, testInfo());
}
@Memoized
List<Object> getTestMethodParameters() {
return testMethodProcessors.getTestMethodParameters(testInfo());
}
static CustomInvocationContext of(TestInfo testInfo) {
return new AutoValue_TestParameterInjectorExtension_CustomInvocationContext(testInfo);
}
@Override
public String getDisplayName(int invocationIndex) {
return testInfo().getName();
}
@Override
public List<Extension> getAdditionalExtensions() {
return ImmutableList.of(new CustomAdditionalExtension());
}
class CustomAdditionalExtension implements ParameterResolver, TestInstancePostProcessor {
@Override
public boolean supportsParameter(
ParameterContext parameterContext, ExtensionContext extensionContext) {
if (parameterContext.getDeclaringExecutable() instanceof Constructor) {
return true;
} else {
return parameterContext
.getDeclaringExecutable()
.isAnnotationPresent(TestParameterInjectorTest.class);
}
}
@Override
public Object resolveParameter(
ParameterContext parameterContext, ExtensionContext extensionContext) {
if (parameterContext.getDeclaringExecutable() instanceof Constructor) {
return getConstructorParameters().get(parameterContext.getIndex());
} else {
return getTestMethodParameters().get(parameterContext.getIndex());
}
}
@Override
public void postProcessTestInstance(Object testInstance, ExtensionContext extensionContext)
throws Exception {
testMethodProcessors.postProcessTestInstance(testInstance, testInfo());
}
}
}
}
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