1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.functor.core.composite;
18  
19  import static org.junit.Assert.assertEquals;
20  import static org.junit.Assert.assertNotNull;
21  import static org.junit.Assert.assertNull;
22  
23  import org.apache.commons.functor.BaseFunctorTest;
24  import org.apache.commons.functor.BinaryFunction;
25  import org.apache.commons.functor.core.Constant;
26  import org.apache.commons.functor.core.LeftIdentity;
27  import org.apache.commons.functor.core.RightIdentity;
28  import org.junit.Test;
29  
30  /**
31   * @version $Revision: 1171255 $ $Date: 2011-09-15 22:27:39 +0200 (Thu, 15 Sep 2011) $
32   * @author Rodney Waldhoff
33   */
34  public class TestTransposedFunction extends BaseFunctorTest {
35  
36      // Functor Testing Framework
37      // ------------------------------------------------------------------------
38  
39      protected Object makeFunctor() {
40          return new TransposedFunction<Object, Object, Object>(LeftIdentity.FUNCTION);
41      }
42  
43      // Tests
44      // ------------------------------------------------------------------------
45  
46      @Test
47      public void testEvaluate() throws Exception {
48          BinaryFunction<Object, Object, Object> f = new TransposedFunction<Object, Object, Object>(LeftIdentity.FUNCTION);
49          assertEquals("xyzzy",f.evaluate(null,"xyzzy"));
50          assertNull(f.evaluate("xyzzy",null));
51      }
52  
53      @Test
54      public void testEquals() throws Exception {
55          BinaryFunction<Object, Object, Object> f = new TransposedFunction<Object, Object, Object>(LeftIdentity.FUNCTION);
56          assertEquals(f,f);
57          assertObjectsAreEqual(f,new TransposedFunction<Object, Object, Object>(LeftIdentity.FUNCTION));
58          assertObjectsAreNotEqual(f,new TransposedFunction<Object, Object, Object>(RightIdentity.FUNCTION));
59          assertObjectsAreNotEqual(f,Constant.of("y"));
60      }
61  
62      @Test
63      public void testTransposeNull() throws Exception {
64          assertNull(TransposedFunction.transpose(null));
65      }
66  
67      @Test
68      public void testTranspose() throws Exception {
69          assertNotNull(TransposedFunction.transpose(Constant.of("x")));
70      }
71  }