SqlSetup: does not work repliably, "full-text" service does not use the service account even though it is provided as a parameter

I have been trying to get this to work but i get this error every time:

VERBOSE: [myServer]:                            [[xSQLServerSetup]installSQL] Test-TargetResource returned false after calling set. | ErrorType: MSFT_xSQLServerSetup.TestFailedAfterSet
VERBOSE: [myServer]: LCM:  [ End    Set      ]  [[xSQLServerSetup]installSQL]  in 63.3120 seconds.
PowerShell DSC resource MSFT_xSQLServerSetup  failed to execute Set-TargetResource functionality with error message: Test-TargetResource returned false after calling set. 
    + CategoryInfo          : InvalidOperation: (:) [], CimException
    + FullyQualifiedErrorId : ProviderOperationExecutionFailure
    + PSComputerName        : localhost

i check program files and dont see an "sql server" folder there. I check the %temp% folder nothing there as well.

The DSC logs are not helpful either:

Job {1983FE4E-8BC6-11E6-80C4-000D3A20899A} : 
MIResult: 1
Error Message: PowerShell DSC resource MSFT_xSQLServerSetup  failed to execute Set-TargetResource functionality with error message: Test-TargetResource returned false after calling set. 
Message ID: ProviderOperationExecutionFailure
Error Category: 7
Error Code: 1
Error Type: MI

Job {1983FE4E-8BC6-11E6-80C4-000D3A20899A} : 
Message Test-TargetResource returned false after calling set. 
HResult -2146233087 
StackTrack    at System.Management.Automation.Interpreter.ThrowInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)

so not sure how to troubleshoot this thing.

Also it seems the path to the setup files has been hardcoded so we have to have the setup files in a folder called "sources".For people like me who use ISO's this forces us to re-package the iso with the sources folder.

Start with the xSQLServerSetup resource, especially the installSQL flow and its Test-TargetResource and Set-TargetResource behavior. Reproduce the failure with the supplied service account and setup path, then verify that installation succeeds and that setup files do not require a hardcoded "sources" directory.