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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 libcore.junit.junit3;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import org.junit.Rule;
import org.junit.rules.MethodRule;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.MultipleFailureException;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;
import static org.junit.internal.runners.rules.RuleMemberValidator.RULE_VALIDATOR;
/**
* A {@link TestCase} that supports the @Rule annotation from JUnit 4.
*
* <p>It supports both {@link TestRule} and {@link MethodRule} based rules when used with the
* {@code @Rule} annotation on public fields and methods. The rules encapsulate the
* {@link TestCase#runBare()} method and so are run before the {@link TestCase#setUp()} and after
* the {@link TestCase#tearDown()} methods.
*
* <p>Classes that extend this must have a single no argument constructor.
*/
public abstract class TestCaseWithRules extends TestCase {
private final TestClass testClass;
private final List<Throwable> validationErrors;
public TestCaseWithRules() {
testClass = new TestClass(getClass());
validationErrors = new ArrayList<>();
RULE_VALIDATOR.validate(testClass, validationErrors);
}
@Override
public void runBare() throws Throwable {
if (!validationErrors.isEmpty()) {
throw new MultipleFailureException(validationErrors);
}
Statement statement = new Statement() {
@Override
public void evaluate() throws Throwable {
superRunBare();
}
};
final String name = getName();
FrameworkMethod frameworkMethod;
try {
Method method = getClass().getMethod(name, (Class[]) null);
frameworkMethod = new FrameworkMethod(method);
} catch (NoSuchMethodException e) {
frameworkMethod = new FrameworkMethod(null) {
@Override
public String getName() {
return name;
}
@Override
public Annotation[] getAnnotations() {
return new Annotation[0];
}
@Override
public <T extends Annotation> T getAnnotation(Class<T> annotationType) {
return null;
}
};
}
Description description =
Description.createTestDescription(getClass(), frameworkMethod.getName(),
frameworkMethod.getAnnotations());
List<Object> rules = testClass.getAnnotatedFieldValues(this, Rule.class, Object.class);
for (Object rule : rules) {
if (rule instanceof TestRule) {
statement = ((TestRule) rule).apply(statement, description);
} else {
statement = ((MethodRule) rule).apply(statement, frameworkMethod, this);
}
}
statement.evaluate();
}
private void superRunBare() throws Throwable {
super.runBare();
}
}
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