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 * http://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 package org.apache.commons.math4.legacy.analysis.function;
19
20 import org.apache.commons.math4.core.jdkmath.JdkMath;
21 import org.junit.Assert;
22 import org.junit.Test;
23
24 /**
25 * Test for all uncovered classes in org.apache.commons.math4.legacy.analysis.function that implement BivariateFunction explicitly.
26 */
27 public class BivariateFunctionTest {
28
29 private static final double EPS = Math.ulp(1d);
30
31 @Test
32 public void testAtan2() {
33 Atan2 atan2 = new Atan2();
34 Assert.assertEquals(JdkMath.PI/4,atan2.value(1,1), EPS);
35 }
36
37 @Test
38 public void testSubtract() {
39 Subtract subtract = new Subtract();
40 Assert.assertEquals(5, subtract.value(10,5), EPS);
41 Assert.assertEquals(-5, subtract.value(5,10), EPS);
42 }
43 }