Test Xunit

graph TD; Test-xUnit-->Install-OpenCover; Install-OpenCover-->Install-ReportGenerator; Install-ReportGenerator-->DotNetCore-Build; DotNetCore-Build-->Clean; DotNetCore-Build-->DotNetCore-Restore; DotNetCore-Build-->Client-Packages; Clean-->Show-Info; Clean-->Print-AppVeyor-Environment-Variables;