Needs Unit Tests

[GaProgMan]

Using the xUnit.NET Test template (dotnet new xunit) add unit tests for the source code in the src directory.

Add the xUnit.NET test library to a directory at the root level (i.e. alongside the src directory) called tests

[GaProgMan]

An xunit test class library has been added. However the services, contexts and helpers need to be mocked to ensure that we are properly testing everything

[GaProgMan]

Add unit tests for db model to view model mappers (i.e BookViewModelHelper)

Example:

var new dbModel
{
      prop = value,
};
var viewModel = dbToViewModelMapper(dbModel);
Assert.AreEqual(value, viewModel.value, $"{nameof(viewModel.value)} should be mapped correctly.");

[GaProgMan]

Since I've moved this project to .NET core 2.1 (2.1.301), the xunit test runner no longer runs. It quits out with an error:

Detecting target frameworks in dwCheckApi.Tests.csproj...
Building for framework netcoreapp2.1...
dwCheckApi.Tests -> /home/jay/Code/Azure/dwCheckApi/dwCheckApi.Tests/bin/Debug/netcoreapp2.1/dwCheckApi.Tests.dll
Running .NET Core 2.1.0 tests for framework netcoreapp2.1...
It was not possible to find any compatible framework version
The specified framework 'Microsoft.NETCore.App', version '2.1.0' was not found.

• Check application dependencies and target a framework version installed at:
  /usr/share/dotnet/
• Installing .NET Core prerequisites might help resolve this problem:
  http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
• The .NET Core framework and SDK can be installed from:
  https://aka.ms/dotnet-download
• The following versions are installed:
  2.1.1 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]

This is a known issue and has been reported on the xunit repo. There is currently a work around by using the latest build from MyGet.

I've TEMPORARILY gotten around this by including:

<RuntimeFrameworkVersion>2.1.0-rc1</RuntimeFrameworkVersion>

in the dwCheckApi.Tests.csproj and ensuring that I have the 2.1.0-rc1 SDK and runtime installed:

jay@Omoikane:~$ dotnet --list-sdks
2.1.300-rc1-008673 [/usr/share/dotnet/sdk]
2.1.301 [/usr/share/dotnet/sdk]
jay@Omoikane:~$ dotnet --list-runtimes
Microsoft.AspNetCore.All 2.1.0-rc1-final [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.0-rc1-final [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.0-rc1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Doing this allows all unit tests to be run (until a new build of xunit is released to NuGet)