79 lines
2.1 KiB
C#
79 lines
2.1 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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#if NETCOREAPP3_1_OR_GREATER
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using System;
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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;
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[TestClass]
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public class Test_NullableRefOfT
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{
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[TestMethod]
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public void Test_NullableRefOfT_CreateNullableRefOfT_Ok()
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{
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int value = 1;
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NullableRef<int> reference = new(ref value);
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Assert.IsTrue(reference.HasValue);
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Assert.IsTrue(Unsafe.AreSame(ref value, ref reference.Value));
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reference.Value++;
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Assert.AreEqual(value, 2);
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}
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[TestMethod]
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public void Test_NullableRefOfT_CreateNullableRefOfT_Null()
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{
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Assert.IsFalse(default(NullableRef<int>).HasValue);
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Assert.IsFalse(NullableRef<int>.Null.HasValue);
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Assert.IsFalse(default(NullableRef<string>).HasValue);
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Assert.IsFalse(NullableRef<string>.Null.HasValue);
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}
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[TestMethod]
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[ExpectedException(typeof(InvalidOperationException))]
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public void Test_NullableRefOfT_CreateNullableRefOfT_Null_Exception()
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{
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NullableRef<int> reference = default;
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_ = reference.Value;
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}
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[TestMethod]
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public void Test_NullableRefOfT_CreateNullableRefOfT_ImplicitRefCast()
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{
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int value = 42;
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Ref<int> reference = new(ref value);
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NullableRef<int> nullableRef = reference;
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Assert.IsTrue(nullableRef.HasValue);
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Assert.IsTrue(Unsafe.AreSame(ref reference.Value, ref nullableRef.Value));
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}
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[TestMethod]
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public void Test_NullableRefOfT_CreateNullableRefOfT_ExplicitCastOfT()
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{
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int value = 42;
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NullableRef<int> reference = new(ref value);
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Assert.AreEqual(value, (int)reference);
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}
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[TestMethod]
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[ExpectedException(typeof(InvalidOperationException))]
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public void Test_NullableRefOfT_CreateNullableRefOfT_ExplicitCastOfT_Exception()
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{
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NullableRef<int> invalid = default;
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_ = (int)invalid;
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}
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}
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#endif |