Working calculator

ServerTests/CalculatorTests.cs

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+using GrpcCalculator.Server;
+
+namespace GrpcCalculator.ServerTests;
+
+public class CalculatorTests
+{
+    [Fact]
+    public void SimpleAddition()
+    {
+        var calculator = new Calculator();
+        calculator = calculator.DigitPressed("5");
+        Assert.Equal("5", calculator.Display);
+        calculator = calculator.OperatorPressed(CalculatorOperator.Addition);
+        Assert.Equal("5", calculator.Display);
+        calculator = calculator.DigitPressed("4");
+        Assert.Equal("4", calculator.Display);
+        calculator = calculator.EqualsPressed();
+        Assert.Equal("9", calculator.Display);
+    }
+
+    [Fact]
+    public void JustEquals()
+    {
+        var calculator = new Calculator();
+        Assert.Equal("0", calculator.Display);
+        calculator = calculator.EqualsPressed();
+        Assert.Equal("0", calculator.Display);
+    }
+
+    [Fact]
+    public void MultipleEquals()
+    {
+        var calculator = new Calculator();
+        calculator = calculator.DigitPressed("2");
+        Assert.Equal("2", calculator.Display);
+        calculator = calculator.OperatorPressed(CalculatorOperator.Multiplication);
+        Assert.Equal("2", calculator.Display);
+        calculator = calculator.EqualsPressed();
+        Assert.Equal("4", calculator.Display);
+        calculator = calculator.EqualsPressed();
+        Assert.Equal("8", calculator.Display);
+    }
+}

ServerTests/GlobalUsings.cs

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+global using Xunit;

ServerTests/ServerTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <RootNamespace>GrpcCalculator.ServerTests</RootNamespace>
+    <AssemblyName>GrpcCalculatorServerTests</AssemblyName>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
+    <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="6.0.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Server\Server.csproj" />
+  </ItemGroup>
+
+</Project>