123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137 |
- /*
- * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- package org.eclipse.jgit.util;
-
- import static org.junit.Assert.assertEquals;
- import static org.junit.Assert.assertTrue;
-
- import org.eclipse.jgit.util.Stats;
- import org.junit.Test;
-
- public class StatsTest {
- @Test
- public void testStatsTrivial() {
- Stats s = new Stats();
- s.add(1);
- s.add(1);
- s.add(1);
- assertEquals(3, s.count());
- assertEquals(1.0, s.min(), 1E-6);
- assertEquals(1.0, s.max(), 1E-6);
- assertEquals(1.0, s.avg(), 1E-6);
- assertEquals(0.0, s.var(), 1E-6);
- assertEquals(0.0, s.stddev(), 1E-6);
- }
-
- @Test
- public void testStats() {
- Stats s = new Stats();
- s.add(1);
- s.add(2);
- s.add(3);
- s.add(4);
- assertEquals(4, s.count());
- assertEquals(1.0, s.min(), 1E-6);
- assertEquals(4.0, s.max(), 1E-6);
- assertEquals(2.5, s.avg(), 1E-6);
- assertEquals(1.666667, s.var(), 1E-6);
- assertEquals(1.290994, s.stddev(), 1E-6);
- }
-
- @Test
- /**
- * see
- * https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Example
- */
- public void testStatsCancellationExample1() {
- Stats s = new Stats();
- s.add(1E8 + 4);
- s.add(1E8 + 7);
- s.add(1E8 + 13);
- s.add(1E8 + 16);
- assertEquals(4, s.count());
- assertEquals(1E8 + 4, s.min(), 1E-6);
- assertEquals(1E8 + 16, s.max(), 1E-6);
- assertEquals(1E8 + 10, s.avg(), 1E-6);
- assertEquals(30, s.var(), 1E-6);
- assertEquals(5.477226, s.stddev(), 1E-6);
- }
-
- @Test
- /**
- * see
- * https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Example
- */
- public void testStatsCancellationExample2() {
- Stats s = new Stats();
- s.add(1E9 + 4);
- s.add(1E9 + 7);
- s.add(1E9 + 13);
- s.add(1E9 + 16);
- assertEquals(4, s.count());
- assertEquals(1E9 + 4, s.min(), 1E-6);
- assertEquals(1E9 + 16, s.max(), 1E-6);
- assertEquals(1E9 + 10, s.avg(), 1E-6);
- assertEquals(30, s.var(), 1E-6);
- assertEquals(5.477226, s.stddev(), 1E-6);
- }
-
- @Test
- public void testNoValues() {
- Stats s = new Stats();
- assertTrue(Double.isNaN(s.var()));
- assertTrue(Double.isNaN(s.stddev()));
- assertTrue(Double.isNaN(s.avg()));
- assertTrue(Double.isNaN(s.min()));
- assertTrue(Double.isNaN(s.max()));
- s.add(42.3);
- assertTrue(Double.isNaN(s.var()));
- assertTrue(Double.isNaN(s.stddev()));
- assertEquals(42.3, s.avg(), 1E-6);
- assertEquals(42.3, s.max(), 1E-6);
- assertEquals(42.3, s.min(), 1E-6);
- s.add(42.3);
- assertEquals(0, s.var(), 1E-6);
- assertEquals(0, s.stddev(), 1E-6);
- }
- }
|