113 lines
3.5 KiB
Java
113 lines
3.5 KiB
Java
/*
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* Copyright (C) 2009 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import com.google.common.annotations.GwtCompatible;
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import junit.framework.AssertionFailedError;
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import junit.framework.TestCase;
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/**
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* Unit test for {@link ComparisonChain}.
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*
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* @author Kevin Bourrillion
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*/
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@GwtCompatible
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public class ComparisonChainTest extends TestCase {
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private static final DontCompareMe DONT_COMPARE_ME = new DontCompareMe();
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private static class DontCompareMe implements Comparable<DontCompareMe> {
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@Override
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public int compareTo(DontCompareMe o) {
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throw new AssertionFailedError();
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}
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}
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public void testCompareBooleans() {
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assertEquals(
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0,
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ComparisonChain.start()
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.compare(true, true)
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.compare(true, Boolean.TRUE)
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.compare(Boolean.TRUE, true)
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.compare(Boolean.TRUE, Boolean.TRUE)
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.result());
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}
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public void testDegenerate() {
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// kinda bogus, but who cares?
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assertEquals(0, ComparisonChain.start().result());
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}
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public void testOneEqual() {
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assertEquals(0, ComparisonChain.start().compare("a", "a").result());
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}
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public void testOneEqualUsingComparator() {
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assertEquals(
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0, ComparisonChain.start().compare("a", "A", String.CASE_INSENSITIVE_ORDER).result());
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}
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public void testManyEqual() {
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assertEquals(
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0,
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ComparisonChain.start()
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.compare(1, 1)
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.compare(1L, 1L)
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.compareFalseFirst(true, true)
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.compare(1.0, 1.0)
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.compare(1.0f, 1.0f)
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.compare("a", "a", Ordering.usingToString())
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.result());
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}
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public void testShortCircuitLess() {
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assertTrue(
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ComparisonChain.start().compare("a", "b").compare(DONT_COMPARE_ME, DONT_COMPARE_ME).result()
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< 0);
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}
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public void testShortCircuitGreater() {
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assertTrue(
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ComparisonChain.start().compare("b", "a").compare(DONT_COMPARE_ME, DONT_COMPARE_ME).result()
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> 0);
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}
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public void testShortCircuitSecondStep() {
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assertTrue(
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ComparisonChain.start()
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.compare("a", "a")
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.compare("a", "b")
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.compare(DONT_COMPARE_ME, DONT_COMPARE_ME)
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.result()
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< 0);
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}
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public void testCompareFalseFirst() {
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assertTrue(ComparisonChain.start().compareFalseFirst(true, true).result() == 0);
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assertTrue(ComparisonChain.start().compareFalseFirst(true, false).result() > 0);
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assertTrue(ComparisonChain.start().compareFalseFirst(false, true).result() < 0);
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assertTrue(ComparisonChain.start().compareFalseFirst(false, false).result() == 0);
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}
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public void testCompareTrueFirst() {
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assertTrue(ComparisonChain.start().compareTrueFirst(true, true).result() == 0);
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assertTrue(ComparisonChain.start().compareTrueFirst(true, false).result() < 0);
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assertTrue(ComparisonChain.start().compareTrueFirst(false, true).result() > 0);
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assertTrue(ComparisonChain.start().compareTrueFirst(false, false).result() == 0);
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}
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}
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