54 lines
2.2 KiB
C#
54 lines
2.2 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.CompilerServices;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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namespace CommunityToolkit.HighPerformance.UnitTests.Extensions;
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[TestClass]
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[SuppressMessage("StyleCop.CSharp.DocumentationRules", "SA1601", Justification = "Partial test class")]
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public partial class Test_ArrayExtensions
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{
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[TestMethod]
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public void Test_ArrayExtensions_DangerousGetReference()
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{
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string[] tokens = "aa,bb,cc,dd,ee,ff,gg,hh,ii".Split(',');
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// In all these "DangerousGetReference" tests, we need to ensure that a reference to a given
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// item within an array is effectively the one corresponding to the one whe expect, which is
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// either a reference to the first item if we use "DangerousGetReference", or one to the n-th
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// item if we use "DangerousGetReferenceAt". So all these tests just invoke the API and then
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// compare the returned reference against an existing baseline (like the built-in array indexer)
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// to ensure that the two are the same. These are all managed references, so no need for pinning.
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ref string r0 = ref Unsafe.AsRef(tokens.DangerousGetReference());
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ref string r1 = ref Unsafe.AsRef(tokens[0]);
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Assert.IsTrue(Unsafe.AreSame(ref r0, ref r1));
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}
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[TestMethod]
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public void Test_ArrayExtensions_DangerousGetReferenceAt_Zero()
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{
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string[] tokens = "aa,bb,cc,dd,ee,ff,gg,hh,ii".Split(',');
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ref string r0 = ref Unsafe.AsRef(tokens.DangerousGetReference());
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ref string r1 = ref Unsafe.AsRef(tokens.DangerousGetReferenceAt(0));
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Assert.IsTrue(Unsafe.AreSame(ref r0, ref r1));
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}
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[TestMethod]
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public void Test_ArrayExtensions_DangerousGetReferenceAt_Index()
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{
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string[] tokens = "aa,bb,cc,dd,ee,ff,gg,hh,ii".Split(',');
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ref string r0 = ref Unsafe.AsRef(tokens.DangerousGetReferenceAt(5));
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ref string r1 = ref Unsafe.AsRef(tokens[5]);
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Assert.IsTrue(Unsafe.AreSame(ref r0, ref r1));
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}
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}
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