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/*
* Copyright (C) 2009 The Guava Authors
*
* 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;
import com.google.common.annotations.GwtCompatible;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;
/**
* Unit test for {@link ComparisonChain}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible
public class ComparisonChainTest extends TestCase {
private static final DontCompareMe DONT_COMPARE_ME = new DontCompareMe();
private static class DontCompareMe implements Comparable<DontCompareMe> {
@Override
public int compareTo(DontCompareMe o) {
throw new AssertionFailedError();
}
}
public void testCompareBooleans() {
assertEquals(
0,
ComparisonChain.start()
.compare(true, true)
.compare(true, Boolean.TRUE)
.compare(Boolean.TRUE, true)
.compare(Boolean.TRUE, Boolean.TRUE)
.result());
}
public void testDegenerate() {
// kinda bogus, but who cares?
assertEquals(0, ComparisonChain.start().result());
}
public void testOneEqual() {
assertEquals(0, ComparisonChain.start().compare("a", "a").result());
}
public void testOneEqualUsingComparator() {
assertEquals(
0, ComparisonChain.start().compare("a", "A", String.CASE_INSENSITIVE_ORDER).result());
}
public void testManyEqual() {
assertEquals(
0,
ComparisonChain.start()
.compare(1, 1)
.compare(1L, 1L)
.compareFalseFirst(true, true)
.compare(1.0, 1.0)
.compare(1.0f, 1.0f)
.compare("a", "a", Ordering.usingToString())
.result());
}
public void testShortCircuitLess() {
assertTrue(
ComparisonChain.start().compare("a", "b").compare(DONT_COMPARE_ME, DONT_COMPARE_ME).result()
< 0);
}
public void testShortCircuitGreater() {
assertTrue(
ComparisonChain.start().compare("b", "a").compare(DONT_COMPARE_ME, DONT_COMPARE_ME).result()
> 0);
}
public void testShortCircuitSecondStep() {
assertTrue(
ComparisonChain.start()
.compare("a", "a")
.compare("a", "b")
.compare(DONT_COMPARE_ME, DONT_COMPARE_ME)
.result()
< 0);
}
public void testCompareFalseFirst() {
assertTrue(ComparisonChain.start().compareFalseFirst(true, true).result() == 0);
assertTrue(ComparisonChain.start().compareFalseFirst(true, false).result() > 0);
assertTrue(ComparisonChain.start().compareFalseFirst(false, true).result() < 0);
assertTrue(ComparisonChain.start().compareFalseFirst(false, false).result() == 0);
}
public void testCompareTrueFirst() {
assertTrue(ComparisonChain.start().compareTrueFirst(true, true).result() == 0);
assertTrue(ComparisonChain.start().compareTrueFirst(true, false).result() < 0);
assertTrue(ComparisonChain.start().compareTrueFirst(false, true).result() > 0);
assertTrue(ComparisonChain.start().compareTrueFirst(false, false).result() == 0);
}
}
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