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 * https://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 18 /* 19 * This is not the original file distributed by the Apache Software Foundation 20 * It has been modified by the Hipparchus project 21 */ 22 package org.hipparchus.clustering.distance; 23 24 import org.junit.jupiter.api.Test; 25 26 import static org.junit.jupiter.api.Assertions.assertEquals; 27 28 /** 29 * Tests for {@link EarthMoversDistance} class. 30 */ 31 class EarthMoversDistanceTest { 32 33 final DistanceMeasure distance = new EarthMoversDistance(); 34 final double[] a = { 0.1, 0.3, 0.2, 0.0, 0.25, 0.15 }; 35 final double[] b = { 0.3, 0.0, 0.4, 0.1, 0.0, 0.2 }; 36 37 @Test 38 void testZero() { 39 assertEquals(0, distance.compute(a, a), 0d); 40 } 41 42 @Test 43 void testZero2() { 44 final double[] zero = new double[] { 0, 0 }; 45 assertEquals(0, distance.compute(zero, zero), 0d); 46 } 47 48 @Test 49 void test() { 50 double expected = 0.65; //0.2 + 0.1 + 0.1 + 0.2 + 0.05 + 0.0; 51 assertEquals(expected, distance.compute(a, b), 1e-10); 52 assertEquals(expected, distance.compute(b, a), 1e-10); 53 } 54 }