1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/*
* DSI utilities
*
* Copyright (C) 2011-2022 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.util;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
//RELEASE-STATUS: DIST
public class KahanSummationTest {
@Test
public void testSum() {
final KahanSummation sum = new KahanSummation();
sum.add(1);
sum.add(2);
sum.add(3);
assertEquals(6, sum.value(), 0);
}
@Test
public void testDifficult() {
final KahanSummation sum = new KahanSummation();
sum.add(Double.MIN_NORMAL);
sum.add(Double.MIN_NORMAL);
sum.add(-Double.MIN_NORMAL);
assertEquals(Double.MIN_NORMAL, sum.value(), 0);
}
}
|
