11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2011 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * you may not use this file except in compliance with the License. 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * You may obtain a copy of the License at 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * distributed under the License is distributed on an "AS IS" BASIS, 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See the License for the specific language governing permissions and 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.testing; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkNotNull; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static junit.framework.Assert.assertEquals; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static junit.framework.Assert.assertTrue; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.Beta; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.GwtCompatible; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.base.Equivalence; 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.collect.ImmutableList; 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.collect.Lists; 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.testing.RelationshipTester.RelationshipAssertion; 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.List; 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Tester for {@link Equivalence} relationships between groups of objects. 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p> 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * To use, create a new {@link EquivalenceTester} and add equivalence groups 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * where each group contains objects that are supposed to be equal to each 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * other. Objects of different groups are expected to be unequal. For example: 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <pre> 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * EquivalenceTester.of(someStringEquivalence) 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * .addEquivalenceGroup("hello", "h" + "ello") 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * .addEquivalenceGroup("world", "wor" + "ld") 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * .test(); 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * } 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * </pre> 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p> 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Note that testing {@link Objects#equals(Object)} is more simply done using 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the {@link EqualsTester}. It includes an extra test against an instance of an 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * arbitrary class without having to explicitly add another equivalence group. 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Gregory Kick 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 10.0 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * TODO(gak): turn this into a test suite so that each test can fail 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * independently 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@Beta 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible public final class EquivalenceTester<T> { 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final int REPETITIONS = 3; 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private final Equivalence<? super T> equivalence; 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private final RelationshipTester<T> delegate; 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private final List<T> items = Lists.newArrayList(); 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert EquivalenceTester(final Equivalence<? super T> equivalence) { 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.equivalence = checkNotNull(equivalence); 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.delegate = new RelationshipTester<T>(new RelationshipAssertion<T>() { 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public void assertRelated(T item, T related) { 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue("$ITEM must be equivalent to $RELATED", equivalence.equivalent(item, related)); 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int itemHash = equivalence.hash(item); 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int relatedHash = equivalence.hash(related); 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals("the hash (" + itemHash + ") of $ITEM must be equal to the hash (" 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert + relatedHash + ") of $RELATED", itemHash, relatedHash); 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public void assertUnrelated(T item, T unrelated) { 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue("$ITEM must be inequivalent to $UNRELATED", 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert !equivalence.equivalent(item, unrelated)); 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }); 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static <T> EquivalenceTester<T> of(Equivalence<? super T> equivalence) { 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new EquivalenceTester<T>(equivalence); 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Adds a group of objects that are supposed to be equivalent to each other 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * and not equivalent to objects in any other equivalence group added to this 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * tester. 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public EquivalenceTester<T> addEquivalenceGroup(T first, T... rest) { 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert addEquivalenceGroup(Lists.asList(first, rest)); 971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public EquivalenceTester<T> addEquivalenceGroup(Iterable<T> group) { 1011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert delegate.addRelatedGroup(group); 1021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert items.addAll(ImmutableList.copyOf(group)); 1031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 1041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** Run tests on equivalence methods, throwing a failure on an invalid test */ 1071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public EquivalenceTester<T> test() { 1081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int run = 0; run < REPETITIONS; run++) { 1091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert testItems(); 1101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert delegate.test(); 1111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 1131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private void testItems() { 1161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (T item : items) { 1171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue(item + " must be inequivalent to null", !equivalence.equivalent(item, null)); 1181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue("null must be inequivalent to " + item, !equivalence.equivalent(null, item)); 1191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue(item + " must be equivalent to itself", equivalence.equivalent(item, item)); 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals("the hash of " + item + " must be consistent", equivalence.hash(item), 1211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert equivalence.hash(item)); 1221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 125