How to use describeTo method of org.hamcrest.core.IsInstanceOf class

Best junit code snippet using org.hamcrest.core.IsInstanceOf.describeTo

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1package org.lunivore.tyburn;
2
3import org.hamcrest.Description;
4import org.hamcrest.Matcher;
5import org.hamcrest.MatcherAssert;
6import org.hamcrest.TypeSafeMatcher;
7import org.hamcrest.core.IsEqual;
8import org.hamcrest.core.IsInstanceOf;
9import org.hamcrest.core.IsNull;
10import org.hamcrest.text.StringContains;
11import org.junit.Assert;
12import org.mockito.Mockito;
13import org.mockito.internal.progress.OngoingStubbing;
14
15public class Behaviour {
16    
17    protected <T> void ensureThat(T obj, Matcher<T> matches) {
18        MatcherAssert.assertThat(obj, matches);
19    }
20
21    protected <T> IsNull<T> isNull() {
22        return new IsNull<T>();
23    }
24
25    protected <T> Matcher<T> eq(T object) {
26        return new IsEqual<T>(object);
27    }
28    
29    protected <T extends Comparable<T>> IsLessThan<T> isLessThan(T object) {
30        return new IsLessThan<T>(object);
31    }
32 
33    protected <T extends Comparable<T>> IsGreaterThanOrEq<T> isGreaterThanOrEq(T object) {
34        return new IsGreaterThanOrEq<T>(object);
35    }
36    
37    protected <T> T mock(Class<T> classToMock) {
38        return Mockito.mock(classToMock);
39    }
40
41    protected <T> T verify(T mock) {
42        return Mockito.verify(mock);
43    }
44
45    protected <T> IsInstanceOf isA(Class<T> clazz) {
46        return new IsInstanceOf(clazz);
47    }
48    
49    
50    protected <T> OngoingStubbing<T> stub(T methodCall) {
51        return Mockito.stub(methodCall);
52    }
53
54
55    protected void ensureThat(boolean expression) {
56        Assert.assertTrue(expression);
57    }
58
59
60    protected Matcher<String> contains(String string) {
61        return new StringContains(string);
62    }
63
64
65    public class IsGreaterThanOrEq<T extends Comparable<T>> extends TypeSafeMatcher<T> {
66        private final Comparable<T> compareTo;
67        
68        public IsGreaterThanOrEq(Comparable<T> compareTo) {
69            this.compareTo = compareTo;
70        }
71        
72        public boolean matchesSafely(T item) {
73            return compareTo.compareTo(item) <= 0;
74        }
75        
76        public void describeTo(Description description) {
77            description.appendText("a value greater than ");
78            description.appendValue(compareTo);
79        }
80    }
81    
82    public class IsLessThan<T extends Comparable<T>> extends TypeSafeMatcher<T> {
83        private final Comparable<T> compareTo;
84        
85        public IsLessThan(Comparable<T> compareTo) {
86            this.compareTo = compareTo;
87        }
88        
89        public boolean matchesSafely(T item) {
90            return compareTo.compareTo(item) > 0;
91        }
92        
93        public void describeTo(Description description) {
94            description.appendText("a value greater than ");
95            description.appendValue(compareTo);
96        }
97    }
98
99}
100
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