1   /*
2    * Copyright 2003-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.commons.math.complex;
18  
19  import junit.framework.TestCase;
20  
21  /***
22   * @version $Revision: 1.6 $ $Date: 2004/02/21 21:35:16 $
23   */
24  public class ComplexTest extends TestCase {
25      
26      public void testConstructor() {
27          Complex z = new Complex(3.0, 4.0);
28          assertEquals(3.0, z.getReal(), 1.0e-5);
29          assertEquals(4.0, z.getImaginary(), 1.0e-5);
30      }
31      
32      public void testConstructorNaN() {
33          Complex z = new Complex(3.0, Double.NaN);
34          assertTrue(z.isNaN());
35  
36          z = new Complex(Double.NaN, 4.0);
37          assertTrue(z.isNaN());
38  
39          z = new Complex(3.0, 4.0);
40          assertFalse(z.isNaN());
41      }
42      
43      public void testAbs() {
44          Complex z = new Complex(3.0, 4.0);
45          assertEquals(5.0, z.abs(), 1.0e-5);
46      }
47      
48      public void testAbsNaN() {
49          assertTrue(Double.isNaN(Complex.NaN.abs()));
50      }
51      
52      public void testAdd() {
53          Complex x = new Complex(3.0, 4.0);
54          Complex y = new Complex(5.0, 6.0);
55          Complex z = x.add(y);
56          assertEquals(8.0, z.getReal(), 1.0e-5);
57          assertEquals(10.0, z.getImaginary(), 1.0e-5);
58      }
59      
60      public void testAddNaN() {
61          Complex x = new Complex(3.0, 4.0);
62          Complex z = x.add(Complex.NaN);
63          assertTrue(z.isNaN());
64      }
65      
66      public void testConjugate() {
67          Complex x = new Complex(3.0, 4.0);
68          Complex z = x.conjugate();
69          assertEquals(3.0, z.getReal(), 1.0e-5);
70          assertEquals(-4.0, z.getImaginary(), 1.0e-5);
71      }
72      
73      public void testConjugateNaN() {
74          Complex z = Complex.NaN.conjugate();
75          assertTrue(z.isNaN());
76      }
77      
78      public void testDivide() {
79          Complex x = new Complex(3.0, 4.0);
80          Complex y = new Complex(5.0, 6.0);
81          Complex z = x.divide(y);
82          assertEquals(39.0 / 61.0, z.getReal(), 1.0e-5);
83          assertEquals(2.0 / 61.0, z.getImaginary(), 1.0e-5);
84      }
85      
86      public void testDivideNaN() {
87          Complex x = new Complex(3.0, 4.0);
88          Complex z = x.divide(Complex.NaN);
89          assertTrue(z.isNaN());
90      }
91      
92      public void testMultiply() {
93          Complex x = new Complex(3.0, 4.0);
94          Complex y = new Complex(5.0, 6.0);
95          Complex z = x.multiply(y);
96          assertEquals(-9.0, z.getReal(), 1.0e-5);
97          assertEquals(38.0, z.getImaginary(), 1.0e-5);
98      }
99      
100     public void testMultiplyNaN() {
101         Complex x = new Complex(3.0, 4.0);
102         Complex z = x.multiply(Complex.NaN);
103         assertTrue(z.isNaN());
104     }
105     
106     public void testNegate() {
107         Complex x = new Complex(3.0, 4.0);
108         Complex z = x.negate();
109         assertEquals(-3.0, z.getReal(), 1.0e-5);
110         assertEquals(-4.0, z.getImaginary(), 1.0e-5);
111     }
112     
113     public void testNegateNaN() {
114         Complex z = Complex.NaN.negate();
115         assertTrue(z.isNaN());
116     }
117     
118     public void testSubtract() {
119         Complex x = new Complex(3.0, 4.0);
120         Complex y = new Complex(5.0, 6.0);
121         Complex z = x.subtract(y);
122         assertEquals(-2.0, z.getReal(), 1.0e-5);
123         assertEquals(-2.0, z.getImaginary(), 1.0e-5);
124     }
125     
126     public void testSubtractNaN() {
127         Complex x = new Complex(3.0, 4.0);
128         Complex z = x.subtract(Complex.NaN);
129         assertTrue(z.isNaN());
130     }
131     
132     public void testEqualsNull() {
133         Complex x = new Complex(3.0, 4.0);
134         assertFalse(x.equals(null));
135     }
136     
137     public void testEqualsClass() {
138         Complex x = new Complex(3.0, 4.0);
139         assertFalse(x.equals(this));
140     }
141     
142     public void testEqualsSame() {
143         Complex x = new Complex(3.0, 4.0);
144         assertTrue(x.equals(x));
145     }
146     
147     public void testEqualsTrue() {
148         Complex x = new Complex(3.0, 4.0);
149         Complex y = new Complex(3.0, 4.0);
150         assertTrue(x.equals(y));
151     }
152     
153     public void testEqualsRealDifference() {
154         Complex x = new Complex(0.0, 0.0);
155         Complex y = new Complex(0.0 + Double.MIN_VALUE, 0.0);
156         assertFalse(x.equals(y));
157     }
158     
159     public void testEqualsImaginaryDifference() {
160         Complex x = new Complex(0.0, 0.0);
161         Complex y = new Complex(0.0, 0.0 + Double.MIN_VALUE);
162         assertFalse(x.equals(y));
163     }
164 }