/*
* Copyright (C) 2008 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.common.collect.testing;
import com.google.common.collect.testing.features.ConflictingRequirementsException;
import com.google.common.collect.testing.features.Feature;
import com.google.common.collect.testing.features.FeatureUtil;
import com.google.common.collect.testing.features.TesterRequirements;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Logger;
/**
* Creates, based on your criteria, a JUnit test suite that exhaustively tests
* the object generated by a G, selecting appropriate tests by matching them
* against specified features.
*
* @param <B> The concrete type of this builder (the 'self-type'). All the
* Builder methods of this class (such as {@link #named}) return this type, so
* that Builder methods of more derived classes can be chained onto them without
* casting.
* @param <G> The type of the generator to be passed to testers in the
* generated test suite. An instance of G should somehow provide an
* instance of the class under test, plus any other information required
* to parameterize the test.
*
* @author George van den Driessche
*/
public abstract class FeatureSpecificTestSuiteBuilder<
B extends FeatureSpecificTestSuiteBuilder<B, G>, G> {
@SuppressWarnings("unchecked")
protected B self() {
return (B) this;
}
// Test Data
private G subjectGenerator;
// Gets run before every test.
private Runnable setUp;
// Gets run at the conclusion of every test.
private Runnable tearDown;
protected B usingGenerator(G subjectGenerator) {
this.subjectGenerator = subjectGenerator;
return self();
}
protected G getSubjectGenerator() {
return subjectGenerator;
}
public B withSetUp(Runnable setUp) {
this.setUp = setUp;
return self();
}
protected Runnable getSetUp() {
return setUp;
}
public B withTearDown(Runnable tearDown) {
this.tearDown = tearDown;
return self();
}
protected Runnable getTearDown() {
return tearDown;
}
// Features
private Set<Feature<?>> features;
/**
* Configures this builder to produce tests appropriate for the given
* features.
*/
public B withFeatures(Feature<?>... features) {
return withFeatures(Arrays.asList(features));
}
public B withFeatures(Iterable<? extends Feature<?>> features) {
this.features = Helpers.copyToSet(features);
return self();
}
protected Set<Feature<?>> getFeatures() {
return Collections.unmodifiableSet(features);
}
// Name
private String name;
/** Configures this builder produce a TestSuite with the given name. */
public B named(String name) {
if (name.contains("(")) {
throw new IllegalArgumentException("Eclipse hides all characters after "
+ "'('; please use '[]' or other characters instead of parentheses");
}
this.name = name;
return self();
}
protected String getName() {
return name;
}
// Test suppression
private Set<Method> suppressedTests = new HashSet<Method>();
/**
* Prevents the given methods from being run as part of the test suite.
*
* <em>Note:</em> in principle this should never need to be used, but it
* might be useful if the semantics of an implementation disagree in
* unforeseen ways with the semantics expected by a test, or to keep dependent
* builds clean in spite of an erroneous test.
*/
public B suppressing(Method... methods) {
return suppressing(Arrays.asList(methods));
}
public B suppressing(Collection<Method> methods) {
suppressedTests.addAll(methods);
return self();
}
protected Set<Method> getSuppressedTests() {
return suppressedTests;
}
private static final Logger logger = Logger.getLogger(
FeatureSpecificTestSuiteBuilder.class.getName());
/**
* Creates a runnable JUnit test suite based on the criteria already given.
*/
/*
* Class parameters must be raw. This annotation should go on testerClass in
* the for loop, but the 1.5 javac crashes on annotations in for loops:
* <http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6294589>
*/
@SuppressWarnings("unchecked")
public TestSuite createTestSuite() {
checkCanCreate();
logger.fine(" Testing: " + name);
logger.fine("Features: " + formatFeatureSet(features));
FeatureUtil.addImpliedFeatures(features);
logger.fine("Expanded: " + formatFeatureSet(features));
// Class parameters must be raw.
List<Class<? extends AbstractTester>> testers = getTesters();
TestSuite suite = new TestSuite(name);
for (Class<? extends AbstractTester> testerClass : testers) {
final TestSuite testerSuite = makeSuiteForTesterClass(
(Class<? extends AbstractTester<?>>) testerClass);
if (testerSuite.countTestCases() > 0) {
suite.addTest(testerSuite);
}
}
return suite;
}
/**
* Throw {@link IllegalStateException} if {@link #createTestSuite()} can't
* be called yet.
*/
protected void checkCanCreate() {
if (subjectGenerator == null) {
throw new IllegalStateException("Call using() before createTestSuite().");
}
if (name == null) {
throw new IllegalStateException("Call named() before createTestSuite().");
}
if (features == null) {
throw new IllegalStateException(
"Call withFeatures() before createTestSuite().");
}
}
// Class parameters must be raw.
protected abstract List<Class<? extends AbstractTester>>
getTesters();
private boolean matches(Test test) {
final Method method;
try {
method = extractMethod(test);
} catch (IllegalArgumentException e) {
logger.finer(Platform.format(
"%s: including by default: %s", test, e.getMessage()));
return true;
}
if (suppressedTests.contains(method)) {
logger.finer(Platform.format(
"%s: excluding because it was explicitly suppressed.", test));
return false;
}
final TesterRequirements requirements;
try {
requirements = FeatureUtil.getTesterRequirements(method);
} catch (ConflictingRequirementsException e) {
throw new RuntimeException(e);
}
Set<Feature<?>> missingFeatures =
Helpers.copyToSet(requirements.getPresentFeatures());
missingFeatures.removeAll(features);
if (!missingFeatures.isEmpty()) {
logger.finer(Platform.format("%s: skipping because these features " +
"are absent: %s", method, missingFeatures));
return false;
}
Set<Feature<?>> unwantedFeatures =
Helpers.copyToSet(requirements.getAbsentFeatures());
unwantedFeatures.retainAll(features);
if (!unwantedFeatures.isEmpty()) {
logger.finer(Platform.format("%s: skipping because these features " +
"are present: %s", method, unwantedFeatures));
return false;
}
return true;
}
private static Method extractMethod(Test test) {
if (test instanceof AbstractTester) {
AbstractTester<?> tester = (AbstractTester<?>) test;
return Platform.getMethod(tester.getClass(), tester.getTestMethodName());
} else if (test instanceof TestCase) {
TestCase testCase = (TestCase) test;
return Platform.getMethod(testCase.getClass(), testCase.getName());
} else {
throw new IllegalArgumentException(
"unable to extract method from test: not a TestCase.");
}
}
protected TestSuite makeSuiteForTesterClass(
Class<? extends AbstractTester<?>> testerClass) {
final TestSuite candidateTests = new TestSuite(testerClass);
final TestSuite suite = filterSuite(candidateTests);
Enumeration<?> allTests = suite.tests();
while (allTests.hasMoreElements()) {
Object test = allTests.nextElement();
if (test instanceof AbstractTester) {
@SuppressWarnings("unchecked")
AbstractTester<? super G> tester = (AbstractTester<? super G>) test;
tester.init(subjectGenerator, name, setUp, tearDown);
}
}
return suite;
}
private TestSuite filterSuite(TestSuite suite) {
TestSuite filtered = new TestSuite(suite.getName());
final Enumeration<?> tests = suite.tests();
while (tests.hasMoreElements()) {
Test test = (Test) tests.nextElement();
if (matches(test)) {
filtered.addTest(test);
}
}
return filtered;
}
protected static String formatFeatureSet(Set<? extends Feature<?>> features) {
List<String> temp = new ArrayList<String>();
for (Feature<?> feature : features) {
Object featureAsObject = feature; // to work around bogus JDK warning
if (featureAsObject instanceof Enum) {
Enum<?> f = (Enum<?>) featureAsObject;
temp.add(Platform.classGetSimpleName(
f.getDeclaringClass()) + "." + feature);
} else {
temp.add(feature.toString());
}
}
return temp.toString();
}
}