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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.BinaryFunction;
27 import org.apache.commons.functor.BinaryPredicate;
28 import org.junit.Test;
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34 public class TestLeftIdentity extends BaseFunctorTest {
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38
39 protected Object makeFunctor() {
40 return LeftIdentity.FUNCTION;
41 }
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45
46 @Test
47 public void testEvaluate() throws Exception {
48 BinaryFunction<Object, Object, Object> f = LeftIdentity.FUNCTION;
49 assertNull(f.evaluate(null,null));
50 assertNull(f.evaluate(null,"xyzzy"));
51 assertEquals("xyzzy",f.evaluate("xyzzy","abcdefg"));
52 assertEquals("xyzzy",f.evaluate("xyzzy",null));
53 assertEquals(new Integer(3),f.evaluate(new Integer(3),null));
54 Object obj = new Long(12345L);
55 assertSame(obj,f.evaluate(obj,null));
56 assertSame(obj,f.evaluate(obj,obj));
57 }
58
59 @Test
60 public void testTest() throws Exception {
61 BinaryPredicate<Boolean, Object> p = LeftIdentity.PREDICATE;
62 assertTrue(p.test(Boolean.TRUE,null));
63 assertTrue(!p.test(Boolean.FALSE,null));
64 try {
65 p.test(null, null);
66 fail("Expected NullPointerException");
67 } catch (NullPointerException npe) {
68 }
69 }
70
71 @Test
72 public void testEquals() throws Exception {
73 BinaryFunction<Object, Object, Object> f = LeftIdentity.<Object, Object>function();
74 assertEquals(f,f);
75 assertObjectsAreEqual(f,LeftIdentity.FUNCTION);
76 assertObjectsAreEqual(f,LeftIdentity.FUNCTION);
77 assertObjectsAreNotEqual(f,RightIdentity.FUNCTION);
78 assertObjectsAreNotEqual(f,Constant.of("abcde"));
79 assertObjectsAreNotEqual(f,Constant.of(true));
80 }
81
82 @Test
83 public void testConstant() throws Exception {
84 assertEquals(LeftIdentity.function(),LeftIdentity.function());
85 }
86 }