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com.nitorcreations.junit.runners.NestedRunner Maven / Gradle / Ivy
/**
* Copyright 2012 Nitor Creations Oy
*
* 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.nitorcreations.junit.runners;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.internal.runners.statements.RunAfters;
import org.junit.internal.runners.statements.RunBefores;
import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.ParentRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
public class NestedRunner extends ParentRunner {
private final List children = new ArrayList();
private final NestedClassRunner delegatedRunner;
private final NestedRunner parentRunner;
public NestedRunner(Class testClass) throws InitializationError {
this(testClass, null);
}
public NestedRunner(Class testClass, NestedRunner parentRunner) throws InitializationError {
super(testClass);
this.parentRunner = parentRunner;
delegatedRunner = new NestedClassRunner(testClass);
children.addAll(delegatedRunner.giveMeTheDamnChildren());
addToChildrenAllNestedClassesWithTestsAndTestMethods(testClass);
}
private void addToChildrenAllNestedClassesWithTestsAndTestMethods(Class testClass) throws InitializationError {
for (Class child : testClass.getDeclaredClasses()) {
if (containsTests(child)) {
children.add(new NestedRunner(child, this));
}
}
}
private boolean containsTests(Class clazz) {
for (Method method : clazz.getMethods()) {
if (method.getAnnotation(Test.class) != null) {
return true;
}
}
return childrenContainTests(clazz);
}
public boolean childrenContainTests(Class clazz) {
for (Class klazz : clazz.getDeclaredClasses()) {
if (containsTests(klazz)) {
return true;
}
}
return false;
}
protected List getChildren() {
return children;
}
@Override
public String getName() {
return getTestClass().getJavaClass().getSimpleName();
}
protected Description describeChild(Object child) {
if (child instanceof Runner) {
return ((Runner)child).getDescription();
} else {
return delegatedRunner.callTheProtectedDescribeChild((FrameworkMethod)child);
}
}
protected void runChild(Object child, RunNotifier notifier) {
if (child instanceof Runner) {
((Runner)child).run(notifier);
} else {
delegatedRunner.callThePrivateRunChild((FrameworkMethod)child, notifier);
}
}
private Object constructTestClass() throws Exception {
if (getTestClass().getOnlyConstructor().getParameterTypes().length == 1 && parentRunner != null) {
Object parent = parentRunner.constructTestClass();
Object newInstance = getTestClass().getOnlyConstructor().newInstance(parent);
delegatedRunner.currentTestObject = newInstance;
return newInstance;
}
Object newInstance = getTestClass().getOnlyConstructor().newInstance();
delegatedRunner.currentTestObject = newInstance;
return newInstance;
}
public List getBefores() {
List befores = new ArrayList();
befores.addAll(getTestClass().getAnnotatedMethods(Before.class));
return befores;
}
public List getAfters() {
List afters = new ArrayList();
afters.addAll(getTestClass().getAnnotatedMethods(After.class));
return afters;
}
private Statement withParentBefores(Statement statement) {
if (parentRunner != null) {
return parentRunner.withParentBefores(new RunBefores(statement, getBefores(), delegatedRunner.currentTestObject));
}
return new RunBefores(statement, getBefores(), delegatedRunner.currentTestObject);
}
private Statement withParentAfters(Statement statement) {
if (parentRunner != null) {
return new RunAfters(parentRunner.withParentAfters(statement), getAfters(), delegatedRunner.currentTestObject);
}
return new RunAfters(statement, getAfters(), delegatedRunner.currentTestObject);
}
private class NestedClassRunner extends BlockJUnit4ClassRunner {
private Object currentTestObject;
public NestedClassRunner(Class childClass) throws InitializationError {
super(childClass);
}
public void callThePrivateRunChild(FrameworkMethod child, RunNotifier notifier) {
runChild(child, notifier);
}
public Description callTheProtectedDescribeChild(FrameworkMethod child) {
return describeChild(child);
}
public Collection giveMeTheDamnChildren() {
return super.getChildren();
}
protected void validateConstructor(List errors) {
validateOnlyOneConstructor(errors);
validateNonStaticInnerClassWithDefaultConstructor(errors);
}
private void validateNonStaticInnerClassWithDefaultConstructor(List errors) {
try {
getTestClass().getJavaClass().getConstructor(NestedRunner.this.getTestClass().getJavaClass());
} catch (NoSuchMethodException e) {
String gripe = "Nested test classes should be non-static and have a public zero-argument constructor";
errors.add(new Exception(gripe));
}
}
protected Object createTest() throws Exception {
return constructTestClass();
}
protected Statement methodBlock(FrameworkMethod method) {
Statement statement = super.methodBlock(method);
statement = withParentBefores(statement);
statement = withParentAfters(statement);
return statement;
}
//Disable withBefores so it won't collide with our @Before handler
@Override
protected Statement withBefores(FrameworkMethod method, Object target,
Statement statement) {
return new RunBefores(statement,
new ArrayList(), target);
}
//Disable withAfters so it won't collide with our @After handler
@Override
protected Statement withAfters(FrameworkMethod method, Object target,
Statement statement) {
return new RunAfters(statement,
new ArrayList(), target);
}
@Override
protected void collectInitializationErrors(List errors) {
validatePublicVoidNoArgMethods(BeforeClass.class, true, errors);
validatePublicVoidNoArgMethods(AfterClass.class, true, errors);
// we have to remove this check because we want non-static classes to work
//validateClassRules(errors);
}
}
}
