How to debug the examples command line runner in image

When we get errors running all tests in headless mode it can be helpful to reproduce the issue in an image with a gui.

First step is to try and reproduce the issue locally in headless mode by running only a subset of tests, in the example below the ones in the package GToolkit-World.

We can them simulate the same run in an image with GUI:

commandLine := CommandLineArguments withArguments: #(
	'--junit-xml-output' '--verbose' 'GToolkit-World' '--no-quit' ).
  

GtExamplesCommandLineHandler activateWith:  commandLine
  

Instead of of using CommandLineHandler>>#activateWith: activateWith: aCommandLine ^ self new commandLine: (self prepareSubcommand: aCommandLine); activate we can also bypass most logic done by the handler and directly execute example.

handler := GtExamplesCommandLineHandler new 
	commandLine: commandLine.
packages := handler sortedPackageNamesToRun.
examplesReportResult := handler basicRunExamplesInPackages: packages
  

We also do not need to use GtExamplesCommandLineHandler CommandLineHandler subclass: #GtExamplesCommandLineHandler instanceVariableNames: '' classVariableNames: '' package: 'GToolkit-Examples-Testing' . Instead we could directly use the example reporter GtExamplesHudsonReport GtExamplesTestingHudsonReport subclass: #GtExamplesHudsonReport instanceVariableNames: '' classVariableNames: '' package: 'GToolkit-Examples-Testing' (this will be called by the command line handler)

GtExamplesHudsonReport runPackage:  'GToolkit-World' asPackage
  

GtExamplesHudsonReport runClass:  GtWorldByScripterExamples
  

Or we can run a single test.

GtExamplesHudsonReport new 
	initializeWithTestCases: {(GtWorldByScripterExamples>>#doesNotUnderstandDebugSession) gtExample};
	reportName: GtWorldByScripterExamples package name, '-', GtWorldByScripterExamples name;
	run