Improve test assembly detection
Improve test assembly detection

dungpa/PowerTools,fsprojects/VisualFSharpPowerTools,isaacabraham/VisualFSharpPowerTools,cloudRoutine/VisualFSharpPowerTools,forki/FSharpVSPowerTools,smoothdeveloper/VisualFSharpPowerTools,cloudRoutine/VisualFSharpPowerTools,vasily-kirichenko/FSharpVSPowerTools,dkinitiate/VisualFSharpPowerTools,fsprojects/VisualFSharpPowerTools,vasily-kirichenko/FSharpVSPowerTools