01: /*
02: * Copyright 2003-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: package org.apache.commons.math.stat.descriptive.moment;
17:
18: import junit.framework.Test;
19: import junit.framework.TestSuite;
20:
21: import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
22: import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
23:
24: /**
25: * Test cases for the {@link UnivariateStatistic} class.
26: * @version $Revision: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
27: */
28: public class KurtosisTest extends
29: StorelessUnivariateStatisticAbstractTest {
30:
31: protected Kurtosis stat;
32:
33: /**
34: * @param name
35: */
36: public KurtosisTest(String name) {
37: super (name);
38: }
39:
40: public static Test suite() {
41: TestSuite suite = new TestSuite(KurtosisTest.class);
42: suite.setName("Kurtosis Tests");
43: return suite;
44: }
45:
46: /* (non-Javadoc)
47: * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#getUnivariateStatistic()
48: */
49: public UnivariateStatistic getUnivariateStatistic() {
50: return new Kurtosis();
51: }
52:
53: /* (non-Javadoc)
54: * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#expectedValue()
55: */
56: public double expectedValue() {
57: return this .kurt;
58: }
59:
60: /**
61: * Make sure Double.NaN is returned iff n < 4
62: *
63: */
64: public void testNaN() {
65: Kurtosis kurt = new Kurtosis();
66: assertTrue(Double.isNaN(kurt.getResult()));
67: kurt.increment(1d);
68: assertTrue(Double.isNaN(kurt.getResult()));
69: kurt.increment(1d);
70: assertTrue(Double.isNaN(kurt.getResult()));
71: kurt.increment(1d);
72: assertTrue(Double.isNaN(kurt.getResult()));
73: kurt.increment(1d);
74: assertFalse(Double.isNaN(kurt.getResult()));
75: }
76:
77: }
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