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1 /*
2  * Copyright (C) 2008 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.common.collect.testing;
18 
19 import static java.util.Collections.disjoint;
20 import static java.util.logging.Level.FINER;
21 
22 import com.google.common.collect.testing.features.ConflictingRequirementsException;
23 import com.google.common.collect.testing.features.Feature;
24 import com.google.common.collect.testing.features.FeatureUtil;
25 import com.google.common.collect.testing.features.TesterRequirements;
26 
27 import junit.framework.Test;
28 import junit.framework.TestCase;
29 import junit.framework.TestSuite;
30 
31 import java.lang.reflect.Method;
32 import java.util.ArrayList;
33 import java.util.Arrays;
34 import java.util.Collection;
35 import java.util.Collections;
36 import java.util.Enumeration;
37 import java.util.HashSet;
38 import java.util.LinkedHashSet;
39 import java.util.List;
40 import java.util.Set;
41 import java.util.logging.Logger;
42 
43 /**
44  * Creates, based on your criteria, a JUnit test suite that exhaustively tests
45  * the object generated by a G, selecting appropriate tests by matching them
46  * against specified features.
47  *
48  * @param <B> The concrete type of this builder (the 'self-type'). All the
49  * Builder methods of this class (such as {@link #named}) return this type, so
50  * that Builder methods of more derived classes can be chained onto them without
51  * casting.
52  * @param <G> The type of the generator to be passed to testers in the
53  * generated test suite. An instance of G should somehow provide an
54  * instance of the class under test, plus any other information required
55  * to parameterize the test.
56  *
57  * @author George van den Driessche
58  */
59 public abstract class FeatureSpecificTestSuiteBuilder<
60     B extends FeatureSpecificTestSuiteBuilder<B, G>, G> {
61   @SuppressWarnings("unchecked")
self()62   protected B self() {
63     return (B) this;
64   }
65 
66   // Test Data
67 
68   private G subjectGenerator;
69   // Gets run before every test.
70   private Runnable setUp;
71   // Gets run at the conclusion of every test.
72   private Runnable tearDown;
73 
usingGenerator(G subjectGenerator)74   protected B usingGenerator(G subjectGenerator) {
75     this.subjectGenerator = subjectGenerator;
76     return self();
77   }
78 
getSubjectGenerator()79   public G getSubjectGenerator() {
80     return subjectGenerator;
81   }
82 
withSetUp(Runnable setUp)83   public B withSetUp(Runnable setUp) {
84     this.setUp = setUp;
85     return self();
86   }
87 
getSetUp()88   protected Runnable getSetUp() {
89     return setUp;
90   }
91 
withTearDown(Runnable tearDown)92   public B withTearDown(Runnable tearDown) {
93     this.tearDown = tearDown;
94     return self();
95   }
96 
getTearDown()97   protected Runnable getTearDown() {
98     return tearDown;
99   }
100 
101   // Features
102 
103   private Set<Feature<?>> features = new LinkedHashSet<Feature<?>>();
104 
105   /**
106    * Configures this builder to produce tests appropriate for the given
107    * features.  This method may be called more than once to add features
108    * in multiple groups.
109    */
withFeatures(Feature<?>.... features)110   public B withFeatures(Feature<?>... features) {
111     return withFeatures(Arrays.asList(features));
112   }
113 
withFeatures(Iterable<? extends Feature<?>> features)114   public B withFeatures(Iterable<? extends Feature<?>> features) {
115     for (Feature<?> feature : features) {
116       this.features.add(feature);
117     }
118     return self();
119   }
120 
getFeatures()121   public Set<Feature<?>> getFeatures() {
122     return Collections.unmodifiableSet(features);
123   }
124 
125   // Name
126 
127   private String name;
128 
129   /** Configures this builder produce a TestSuite with the given name. */
named(String name)130   public B named(String name) {
131     if (name.contains("(")) {
132       throw new IllegalArgumentException("Eclipse hides all characters after "
133           + "'('; please use '[]' or other characters instead of parentheses");
134     }
135     this.name = name;
136     return self();
137   }
138 
getName()139   public String getName() {
140     return name;
141   }
142 
143   // Test suppression
144 
145   private Set<Method> suppressedTests = new HashSet<Method>();
146 
147   /**
148    * Prevents the given methods from being run as part of the test suite.
149    *
150    * <em>Note:</em> in principle this should never need to be used, but it
151    * might be useful if the semantics of an implementation disagree in
152    * unforeseen ways with the semantics expected by a test, or to keep dependent
153    * builds clean in spite of an erroneous test.
154    */
suppressing(Method... methods)155   public B suppressing(Method... methods) {
156     return suppressing(Arrays.asList(methods));
157   }
158 
suppressing(Collection<Method> methods)159   public B suppressing(Collection<Method> methods) {
160     suppressedTests.addAll(methods);
161     return self();
162   }
163 
getSuppressedTests()164   public Set<Method> getSuppressedTests() {
165     return suppressedTests;
166   }
167 
168   private static final Logger logger = Logger.getLogger(
169       FeatureSpecificTestSuiteBuilder.class.getName());
170 
171   /**
172    * Creates a runnable JUnit test suite based on the criteria already given.
173    */
174   /*
175    * Class parameters must be raw. This annotation should go on testerClass in
176    * the for loop, but the 1.5 javac crashes on annotations in for loops:
177    * <http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6294589>
178    */
179   @SuppressWarnings("unchecked")
createTestSuite()180   public TestSuite createTestSuite() {
181     checkCanCreate();
182 
183     logger.fine(" Testing: " + name);
184     logger.fine("Features: " + formatFeatureSet(features));
185 
186     FeatureUtil.addImpliedFeatures(features);
187 
188     logger.fine("Expanded: " + formatFeatureSet(features));
189 
190     // Class parameters must be raw.
191     List<Class<? extends AbstractTester>> testers = getTesters();
192 
193     TestSuite suite = new TestSuite(name);
194     for (Class<? extends AbstractTester> testerClass : testers) {
195       final TestSuite testerSuite = makeSuiteForTesterClass(
196           (Class<? extends AbstractTester<?>>) testerClass);
197       if (testerSuite.countTestCases() > 0) {
198         suite.addTest(testerSuite);
199       }
200     }
201     return suite;
202   }
203 
204   /**
205    * Throw {@link IllegalStateException} if {@link #createTestSuite()} can't
206    * be called yet.
207    */
checkCanCreate()208   protected void checkCanCreate() {
209     if (subjectGenerator == null) {
210       throw new IllegalStateException("Call using() before createTestSuite().");
211     }
212     if (name == null) {
213       throw new IllegalStateException("Call named() before createTestSuite().");
214     }
215     if (features == null) {
216       throw new IllegalStateException(
217           "Call withFeatures() before createTestSuite().");
218     }
219   }
220 
221   // Class parameters must be raw.
222   protected abstract List<Class<? extends AbstractTester>>
getTesters()223       getTesters();
224 
matches(Test test)225   private boolean matches(Test test) {
226     final Method method;
227     try {
228       method = extractMethod(test);
229     } catch (IllegalArgumentException e) {
230       logger.finer(Platform.format(
231           "%s: including by default: %s", test, e.getMessage()));
232       return true;
233     }
234     if (suppressedTests.contains(method)) {
235       logger.finer(Platform.format(
236           "%s: excluding because it was explicitly suppressed.", test));
237       return false;
238     }
239     final TesterRequirements requirements;
240     try {
241       requirements = FeatureUtil.getTesterRequirements(method);
242     } catch (ConflictingRequirementsException e) {
243       throw new RuntimeException(e);
244     }
245     if (!features.containsAll(requirements.getPresentFeatures())) {
246       if (logger.isLoggable(FINER)) {
247         Set<Feature<?>> missingFeatures =
248             Helpers.copyToSet(requirements.getPresentFeatures());
249         missingFeatures.removeAll(features);
250         logger.finer(Platform.format(
251             "%s: skipping because these features are absent: %s",
252            method, missingFeatures));
253       }
254       return false;
255     }
256     if (intersect(features, requirements.getAbsentFeatures())) {
257       if (logger.isLoggable(FINER)) {
258         Set<Feature<?>> unwantedFeatures =
259             Helpers.copyToSet(requirements.getAbsentFeatures());
260         unwantedFeatures.retainAll(features);
261         logger.finer(Platform.format(
262             "%s: skipping because these features are present: %s",
263             method, unwantedFeatures));
264       }
265       return false;
266     }
267     return true;
268   }
269 
intersect(Set<?> a, Set<?> b)270   private static boolean intersect(Set<?> a, Set<?> b) {
271     return !disjoint(a, b);
272   }
273 
extractMethod(Test test)274   private static Method extractMethod(Test test) {
275     if (test instanceof AbstractTester) {
276       AbstractTester<?> tester = (AbstractTester<?>) test;
277       return Helpers.getMethod(tester.getClass(), tester.getTestMethodName());
278     } else if (test instanceof TestCase) {
279       TestCase testCase = (TestCase) test;
280       return Helpers.getMethod(testCase.getClass(), testCase.getName());
281     } else {
282       throw new IllegalArgumentException(
283           "unable to extract method from test: not a TestCase.");
284     }
285   }
286 
makeSuiteForTesterClass( Class<? extends AbstractTester<?>> testerClass)287   protected TestSuite makeSuiteForTesterClass(
288       Class<? extends AbstractTester<?>> testerClass) {
289     final TestSuite candidateTests = new TestSuite(testerClass);
290     final TestSuite suite = filterSuite(candidateTests);
291 
292     Enumeration<?> allTests = suite.tests();
293     while (allTests.hasMoreElements()) {
294       Object test = allTests.nextElement();
295       if (test instanceof AbstractTester) {
296         @SuppressWarnings("unchecked")
297         AbstractTester<? super G> tester = (AbstractTester<? super G>) test;
298         tester.init(subjectGenerator, name, setUp, tearDown);
299       }
300     }
301 
302     return suite;
303   }
304 
filterSuite(TestSuite suite)305   private TestSuite filterSuite(TestSuite suite) {
306     TestSuite filtered = new TestSuite(suite.getName());
307     final Enumeration<?> tests = suite.tests();
308     while (tests.hasMoreElements()) {
309       Test test = (Test) tests.nextElement();
310       if (matches(test)) {
311         filtered.addTest(test);
312       }
313     }
314     return filtered;
315   }
316 
formatFeatureSet(Set<? extends Feature<?>> features)317   protected static String formatFeatureSet(Set<? extends Feature<?>> features) {
318     List<String> temp = new ArrayList<String>();
319     for (Feature<?> feature : features) {
320       Object featureAsObject = feature; // to work around bogus JDK warning
321       if (featureAsObject instanceof Enum) {
322         Enum<?> f = (Enum<?>) featureAsObject;
323         temp.add(f.getDeclaringClass().getSimpleName() + "." + feature);
324       } else {
325         temp.add(feature.toString());
326       }
327     }
328     return temp.toString();
329   }
330 }
331