Create reverser that reverses an array at a given position.

73_Reverse/csharp/Reverse/Reverse.Tests/Reverse.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.0.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Reverse\Reverse.csproj" />
+  </ItemGroup>
+
+</Project>

73_Reverse/csharp/Reverse/Reverse.Tests/ReverserTests.cs

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+using System.Linq;
+using Xunit;
+
+namespace Reverse.Tests
+{
+    public class ReverserTests
+    {
+        [Theory]
+        [InlineData(new int[] { 1 }, new int[] { 1 })]
+        [InlineData(new int[] { 1, 2 }, new int[] { 2, 1 })]
+        [InlineData(new int[] { 1, 2, 3 }, new int[] { 3, 2, 1 })]
+        public void ReverserReversesTheArray(int[] input, int[] output)
+        {
+            Reverser.Reverse(input, input.Length);
+
+            Assert.True(input.SequenceEqual(output));
+        }
+
+        [Fact]
+        public void ReverserReversesTheArrayAtTheSpecifiedIndex()
+        {
+            var input = new int[] { 1, 2, 3, 4 };
+            var output = new int[] { 2, 1, 3, 4 };
+
+            Reverser.Reverse(input, 2);
+
+            Assert.True(input.SequenceEqual(output));
+        }
+
+        [Fact]
+        public void ReversingAtIndexOneDoesNotChangeTheArray()
+        {
+            var input = new int[] { 1, 2 };
+            var output = new int[] { 1, 2 };
+
+            Reverser.Reverse(input, 1);
+
+            Assert.True(input.SequenceEqual(output));
+        }
+    }
+}