WIP Add Redis connection factory and manager

The Redis connection manager is responsible for initialising the
connection to the Redis server and attempting to restore the connection
when dropped.

It is based heavily on the `RedisConnection` class in the Azure Cache
for Redis sample for ASP.NET Core [1].

TODO: Improved commit message

[1] https://github.com/Azure-Samples/azure-cache-redis-samples/blob/main/quickstart/aspnet-core/ContosoTeamStats/RedisConnection.cs

Author: smfeest

Buttercup.sln

@@ -34,6 +34,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Buttercup.Application", "sr
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Buttercup.Application.Tests", "src\Buttercup.Application.Tests\Buttercup.Application.Tests.csproj", "{00B87344-63DF-4574-A5F6-F1BD5232033F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Buttercup.Redis", "src\Buttercup.Redis\Buttercup.Redis.csproj", "{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Buttercup.Redis.Tests", "src\Buttercup.Redis.Tests\Buttercup.Redis.Tests.csproj", "{434E5794-262A-45AA-A972-BC43E41D5E15}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -215,6 +219,30 @@ Global
 		{00B87344-63DF-4574-A5F6-F1BD5232033F}.Release|x64.Build.0 = Release|Any CPU
 		{00B87344-63DF-4574-A5F6-F1BD5232033F}.Release|x86.ActiveCfg = Release|Any CPU
 		{00B87344-63DF-4574-A5F6-F1BD5232033F}.Release|x86.Build.0 = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|x64.Build.0 = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Debug|x86.Build.0 = Debug|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|x64.ActiveCfg = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|x64.Build.0 = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|x86.ActiveCfg = Release|Any CPU
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC}.Release|x86.Build.0 = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|x64.Build.0 = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Debug|x86.Build.0 = Debug|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|Any CPU.Build.0 = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|x64.ActiveCfg = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|x64.Build.0 = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|x86.ActiveCfg = Release|Any CPU
+		{434E5794-262A-45AA-A972-BC43E41D5E15}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{C1FBF99E-812B-4376-B483-73F708864933} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
@@ -231,5 +259,7 @@ Global
 		{6984E338-14FA-421E-90B6-921AD05940EF} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
 		{EE8E0C19-A969-4CEF-AB99-5C41A6B27990} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
 		{00B87344-63DF-4574-A5F6-F1BD5232033F} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
+		{E89C44A4-FA47-4EEE-A558-9EAE2944C5AC} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
+		{434E5794-262A-45AA-A972-BC43E41D5E15} = {309ABF0B-35CC-40DE-BCDF-E326309442D1}
 	EndGlobalSection
 EndGlobal

src/Buttercup.Redis.Tests/Buttercup.Redis.Tests.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <RootNamespace>Buttercup.Redis</RootNamespace>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.TimeProvider.Testing" Version="9.2.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+    <PackageReference Include="Moq" Version="4.20.72" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="6.0.4">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Buttercup.Redis\Buttercup.Redis.csproj" />
+  </ItemGroup>
+</Project>

src/Buttercup.Redis.Tests/RedisConnectionFactoryTests.cs

@@ -0,0 +1,29 @@
+using Microsoft.Extensions.Options;
+using StackExchange.Redis;
+using Xunit;
+
+namespace Buttercup.Redis;
+
+public sealed class RedisConnectionFactoryTests
+{
+    #region NewConnection
+
+    [Fact]
+    public async Task NewConnection_ReturnsNewConnection()
+    {
+        var options = new RedisConnectionOptions
+        {
+            ConnectionString = "localhost,abortConnect=false",
+        };
+
+        var connectionFactory = new RedisConnectionFactory(Options.Create(options));
+
+        var connection = await connectionFactory.NewConnection();
+
+        Assert.Equal(
+            ConfigurationOptions.Parse(options.ConnectionString).ToString(),
+            connection.Configuration);
+    }
+
+    #endregion
+}