Install Test Runner Service: support for VSC workspaces (launch config)

[christianbraeunlich]

Hello there,

when trying to install the Test Runner Service from within a vscode workspace via vscode command AL Test Runner: Install Test Runner Service it throws an error.

Used sample project structure:

root
├── app
|   ├── .alpackages
|   ├── src
|   └── app.json
├── test
|   ├── .alpackages
|   ├── src
|   └── app.json
├── README.md
└── testproject.code-workspace

Error message:

PS C:\Users\notebook\Documents\AL\ALProject4\test> if ($null -eq (Get-Module ALTestRunner)) {Import-Module "c:\Users\notebook\.vscode\extensions\jamespearson.al-test-runner-10.10.10\PowerShell\ALTestRunner.psm1" -DisableNameChecking}
PS C:\Users\notebook\Documents\AL\ALProject4\test> Install-TestRunnerService -LaunchConfig 'undefined'
Get-Content : Der Pfad "C:\Users\notebook\Documents\AL\ALProject4\test\.vscode\launch.json" kann nicht 
gefunden werden, da er nicht vorhanden ist.
In C:\Users\notebook\.vscode\extensions\jamespearson.al-test-runner-0.10.3\PowerShell\Select-ALTestRunnerCo 
nfig.ps1:7 Zeichen:37
+     $LaunchJson = ConvertFrom-Json (Get-Content $LaunchJsonPath -Raw)
+                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Users\notebook\launch.json:String) [Get-Content], ItemN  
   otFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetContentCommand

ConvertFrom-Json : Das Argument kann nicht an den Parameter "InputObject" gebunden werden, da es NULL ist.     
In C:\Users\notebook\.vscode\extensions\jamespearson.al-test-runner-0.10.3\PowerShell\Select-ALTestRunnerCo 
nfig.ps1:7 Zeichen:36
+     $LaunchJson = ConvertFrom-Json (Get-Content $LaunchJsonPath -Raw)
+                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [ConvertFrom-Json], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.Co  
   nvertFromJsonCommand

Please enter the name of the launch configuration to use in the AL Test Runner config file.
In C:\Users\notebook\.vscode\extensions\jamespearson.al-test-runner-0.10.3\PowerShell\Select-ALTestRunnerCo 
nfig.ps1:14 Zeichen:9
+         throw "Please enter the name of the launch configuration to u ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OperationStopped: (Please enter th...er config file.:String) [], RuntimeExcepti  
   on
    + FullyQualifiedErrorId : Please enter the name of the launch configuration to use in the AL Test Runner   
   config file.

Would it be possible to extend the Install Test Runner Service command by support for VSC workspaces (related to #79) as well?

Thanks in advance
/Christian