Add project files.

MartianRobotsSolver.Tests/MartianRobotsSolver.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="6.7.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MartianRobotsSolver\MartianRobotsSolver.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="sample_scent_output.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="sample_scent_input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="sample_input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="sample_output.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

MartianRobotsSolver.Tests/UnitTestMarsSolver.cs

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+using FluentAssertions;
+
+namespace MartianRobotsSolver.Tests
+{
+    public class UnitTestMarsSolver
+    {
+        [Fact]
+        public async Task Sample_Solver_Test()
+        {
+            var input = await File.ReadAllTextAsync("sample_input.txt");
+            var result = new MarsSolver().Process(input);
+            var expectedOutput = await File.ReadAllTextAsync("sample_output.txt");
+            result.Output.Should().Be(expectedOutput);
+        }
+
+        [Fact]
+        public async Task Second_Robot_Sense_The_Scent()
+        {
+            var input = await File.ReadAllTextAsync("sample_scent_input.txt");
+            var result = new MarsSolver().Process(input);
+            var expectedOutput = await File.ReadAllTextAsync("sample_scent_output.txt");
+            result.Output.Should().Be(expectedOutput);
+        }
+    }
+}

MartianRobotsSolver.Tests/Usings.cs

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+global using Xunit;

MartianRobotsSolver.Tests/sample_input.txt

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+5 3
+1 1 E
+RFRFRFRF
+3 2 N
+FRRFLLFFRRFLL
+0 3 W
+LLFFFRFLFL

MartianRobotsSolver.Tests/sample_output.txt

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+1 1 E
+3 3 N LOST
+4 2 N

MartianRobotsSolver.Tests/sample_scent_input.txt

@@ -0,0 +1,9 @@
+5 3
+1 1 E
+RFRFRFRF
+3 2 N
+FRRFLLFFRRFLL
+3 2 N
+FRRFLLFFRRFLL
+0 3 W
+LLFFFRFLFL

MartianRobotsSolver.Tests/sample_scent_output.txt

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+1 1 E
+3 3 N LOST
+3 2 N
+4 2 N