1 #region Copyright notice and license 2 // Protocol Buffers - Google's data interchange format 3 // Copyright 2017 Google Inc. All rights reserved. 4 // https://developers.google.com/protocol-buffers/ 5 // 6 // Redistribution and use in source and binary forms, with or without 7 // modification, are permitted provided that the following conditions are 8 // met: 9 // 10 // * Redistributions of source code must retain the above copyright 11 // notice, this list of conditions and the following disclaimer. 12 // * Redistributions in binary form must reproduce the above 13 // copyright notice, this list of conditions and the following disclaimer 14 // in the documentation and/or other materials provided with the 15 // distribution. 16 // * Neither the name of Google Inc. nor the names of its 17 // contributors may be used to endorse or promote products derived from 18 // this software without specific prior written permission. 19 // 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 #endregion 32 33 using NUnit.Framework; 34 using System.Collections.Generic; 35 using System.Linq; 36 using static Google.Protobuf.Collections.ProtobufEqualityComparers; 37 38 namespace Google.Protobuf.Collections 39 { 40 public class ProtobufEqualityComparersTest 41 { 42 private static readonly double[] doubles = 43 { 44 0, 45 1, 46 1.5, 47 -1.5, 48 double.PositiveInfinity, 49 double.NegativeInfinity, 50 // Three different types of NaN... 51 SampleNaNs.Regular, 52 SampleNaNs.SignallingFlipped, 53 SampleNaNs.PayloadFlipped 54 }; 55 56 [Test] GetEqualityComparer_Default()57 public void GetEqualityComparer_Default() 58 { 59 // It's more pain than it's worth to try to parameterize these tests. 60 Assert.AreSame(EqualityComparer<object>.Default, GetEqualityComparer<object>()); 61 Assert.AreSame(EqualityComparer<string>.Default, GetEqualityComparer<string>()); 62 Assert.AreSame(EqualityComparer<int>.Default, GetEqualityComparer<int>()); 63 Assert.AreSame(EqualityComparer<int?>.Default, GetEqualityComparer<int?>()); 64 } 65 66 [Test] GetEqualityComparer_NotDefault()67 public void GetEqualityComparer_NotDefault() 68 { 69 // It's more pain than it's worth to try to parameterize these tests. 70 Assert.AreSame(BitwiseDoubleEqualityComparer, GetEqualityComparer<double>()); 71 Assert.AreSame(BitwiseSingleEqualityComparer, GetEqualityComparer<float>()); 72 Assert.AreSame(BitwiseNullableDoubleEqualityComparer, GetEqualityComparer<double?>()); 73 Assert.AreSame(BitwiseNullableSingleEqualityComparer, GetEqualityComparer<float?>()); 74 } 75 76 [Test] DoubleComparisons()77 public void DoubleComparisons() 78 { 79 ValidateEqualityComparer(BitwiseDoubleEqualityComparer, doubles); 80 } 81 82 [Test] NullableDoubleComparisons()83 public void NullableDoubleComparisons() 84 { 85 ValidateEqualityComparer(BitwiseNullableDoubleEqualityComparer, doubles.Select(d => (double?) d).Concat(new double?[] { null })); 86 } 87 88 [Test] SingleComparisons()89 public void SingleComparisons() 90 { 91 ValidateEqualityComparer(BitwiseSingleEqualityComparer, doubles.Select(d => (float) d)); 92 } 93 94 [Test] NullableSingleComparisons()95 public void NullableSingleComparisons() 96 { 97 ValidateEqualityComparer(BitwiseNullableSingleEqualityComparer, doubles.Select(d => (float?) d).Concat(new float?[] { null })); 98 } 99 ValidateEqualityComparer(EqualityComparer<T> comparer, IEnumerable<T> values)100 private static void ValidateEqualityComparer<T>(EqualityComparer<T> comparer, IEnumerable<T> values) 101 { 102 var array = values.ToArray(); 103 // Each value should be equal to itself, but not to any other value. 104 for (int i = 0; i < array.Length; i++) 105 { 106 for (int j = 0; j < array.Length; j++) 107 { 108 if (i == j) 109 { 110 Assert.IsTrue(comparer.Equals(array[i], array[j]), 111 "{0} should be equal to itself", array[i], array[j]); 112 } 113 else 114 { 115 Assert.IsFalse(comparer.Equals(array[i], array[j]), 116 "{0} and {1} should not be equal", array[i], array[j]); 117 Assert.AreNotEqual(comparer.GetHashCode(array[i]), comparer.GetHashCode(array[j]), 118 "Hash codes for {0} and {1} should not be equal", array[i], array[j]); 119 } 120 } 121 } 122 } 123 } 124 } 125