How to use theInstance method of org.hamcrest.core.IsSame class

Best junit code snippet using org.hamcrest.core.IsSame.theInstance

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1/*  Copyright (c) 2000-2006 hamcrest.org
2 */
3package org.hamcrest.core;
4
5import static org.hamcrest.core.IsSame.theInstance;
6import static org.hamcrest.core.IsSame.sameInstance;
7import static org.hamcrest.core.IsNot.not;
8import org.hamcrest.AbstractMatcherTest;
9import org.hamcrest.Matcher;
10import static org.hamcrest.MatcherAssert.assertThat;
11
12
13public class IsSameTest extends AbstractMatcherTest {
14
15    @Override
16    protected Matcher<?> createMatcher() {
17        return sameInstance("irrelevant");
18    }
19
20    public void testEvaluatesToTrueIfArgumentIsReferenceToASpecifiedObject() {
21        Object o1 = new Object();
22        Object o2 = new Object();
23
24        assertThat(o1, sameInstance(o1));
25        assertThat(o2, not(sameInstance(o1)));
26    }
27
28    public void testAlternativeFactoryMethodAlsoMatchesOnlyIfArgumentIsReferenceToASpecifiedObject() {
29        Object o1 = new Object();
30        Object o2 = new Object();
31        
32        assertThat(o1, theInstance(o1));
33        assertThat(o2, not(theInstance(o1)));
34    }
35
36    public void testReturnsReadableDescriptionFromToString() {
37        assertDescription("sameInstance(\"ARG\")", sameInstance("ARG"));
38    }
39
40    public void testReturnsReadableDescriptionFromToStringWhenInitialisedWithNull() {
41        assertDescription("sameInstance(null)", sameInstance(null));
42    }
43}
44
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