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 package org.apache.commons.rng.sampling.distribution;
18
19 import org.apache.commons.rng.UniformRandomProvider;
20 import org.apache.commons.rng.sampling.RandomAssert;
21 import org.junit.jupiter.api.Assertions;
22 import org.junit.jupiter.api.Test;
23
24
25 /**
26 * This test checks the {@link PoissonSampler} can be created
27 * from a saved state.
28 */
29 class PoissonSamplerTest {
30 /**
31 * Test the SharedStateSampler implementation with a mean below 40.
32 */
33 @Test
34 void testSharedStateSamplerWithSmallMean() {
35 testSharedStateSampler(34.5);
36 }
37
38 /**
39 * Test the SharedStateSampler implementation with a mean above 40.
40 */
41 @Test
42 void testSharedStateSamplerWithLargeMean() {
43 testSharedStateSampler(67.8);
44 }
45
46 /**
47 * Test the SharedStateSampler implementation.
48 *
49 * @param mean Mean.
50 */
51 private static void testSharedStateSampler(double mean) {
52 final UniformRandomProvider rng1 = RandomAssert.seededRNG();
53 final UniformRandomProvider rng2 = RandomAssert.seededRNG();
54 // Use instance constructor not factory constructor to exercise 1.X public API
55 final SharedStateDiscreteSampler sampler1 =
56 new PoissonSampler(rng1, mean);
57 final SharedStateDiscreteSampler sampler2 = sampler1.withUniformRandomProvider(rng2);
58 RandomAssert.assertProduceSameSequence(sampler1, sampler2);
59 }
60
61 /**
62 * Test the toString method. This is added to ensure coverage as the factory constructor
63 * used in other tests does not create an instance of the wrapper class.
64 */
65 @Test
66 void testToString() {
67 final UniformRandomProvider rng = RandomAssert.seededRNG();
68 Assertions.assertTrue(new PoissonSampler(rng, 1.23).toString().toLowerCase().contains("poisson"));
69 }
70 }