| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.numbers.gamma; |
| |
| import org.junit.jupiter.api.Assertions; |
| import org.junit.jupiter.api.Test; |
| |
| /** |
| * Tests for {@link LogGamma1p}. |
| */ |
| public class LogGamma1pTest { |
| private static final double[][] LOG_GAMMA1P_REF = { |
| {-0.5, .5723649429247001}, |
| {-0.375, .3608294954889402}, |
| {-0.25, .2032809514312954}, |
| {-0.125, .08585870722533433}, |
| {0.0, 0.0}, |
| {0.125, -.06002318412603958}, |
| {0.25, -.09827183642181316}, |
| {0.375, -.1177552707410788}, |
| {0.5, -.1207822376352452}, |
| {0.625, -.1091741337567954}, |
| {0.75, -.08440112102048555}, |
| {0.875, -0.0476726853991883}, |
| {1.0, 0.0}, |
| {1.125, .05775985153034387}, |
| {1.25, .1248717148923966}, |
| {1.375, .2006984603774558}, |
| {1.5, .2846828704729192}, |
| }; |
| |
| @Test |
| public void testLogGamma1p() { |
| final int ulps = 3; |
| for (int i = 0; i < LOG_GAMMA1P_REF.length; i++) { |
| final double[] ref = LOG_GAMMA1P_REF[i]; |
| final double x = ref[0]; |
| final double expected = ref[1]; |
| final double actual = LogGamma1p.value(x); |
| final double tol = ulps * Math.ulp(expected); |
| Assertions.assertEquals(expected, actual, tol, Double.toString(x)); |
| } |
| } |
| |
| @Test |
| public void testLogGamma1pPrecondition1() { |
| Assertions.assertThrows(GammaException.class, |
| () -> LogGamma1p.value(-0.51) |
| ); |
| } |
| |
| @Test |
| public void testLogGamma1pPrecondition2() { |
| Assertions.assertThrows(GammaException.class, |
| () -> LogGamma1p.value(1.51) |
| ); |
| } |
| } |