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17 package org.apache.commons.functor.core;
18
19 import static org.junit.Assert.assertEquals;
20 import static org.junit.Assert.assertNull;
21 import static org.junit.Assert.assertSame;
22 import static org.junit.Assert.assertTrue;
23 import static org.junit.Assert.fail;
24
25 import org.apache.commons.functor.BaseFunctorTest;
26 import org.apache.commons.functor.UnaryFunction;
27 import org.apache.commons.functor.UnaryPredicate;
28 import org.junit.Test;
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33
34 public class TestIdentity extends BaseFunctorTest {
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38
39 protected Object makeFunctor() {
40 return Identity.INSTANCE;
41 }
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45
46 @Test
47 public void testEvaluate() throws Exception {
48 UnaryFunction<Object, Object> f = new Identity<Object>();
49 assertNull(f.evaluate(null));
50 assertEquals("xyzzy",f.evaluate("xyzzy"));
51 assertEquals(new Integer(3),f.evaluate(new Integer(3)));
52 Object obj = new Long(12345L);
53 assertSame(obj,f.evaluate(obj));
54 }
55
56 @Test
57 public void testTest() throws Exception {
58 UnaryPredicate<Object> p = new Identity<Object>();
59 assertTrue(p.test(Boolean.TRUE));
60 assertTrue(!p.test(Boolean.FALSE));
61 try {
62 p.test("true");
63 fail("Expected ClassCastException");
64 } catch(ClassCastException e) {
65
66 }
67 try {
68 p.test(null);
69 fail("Expected NullPointerException");
70 } catch(NullPointerException e) {
71
72 }
73 }
74
75 @Test
76 public void testEquals() throws Exception {
77 UnaryFunction<Object, Object> f = new Identity<Object>();
78 assertEquals(f,f);
79 assertObjectsAreEqual(f,new Identity<Object>());
80 assertObjectsAreEqual(f,Identity.instance());
81 assertObjectsAreNotEqual(f,Constant.of("abcde"));
82 }
83
84 @Test
85 public void testConstant() throws Exception {
86 assertEquals(Identity.instance(),Identity.instance());
87 }
88 }