When a TypeTable is created it includes the types from type files provided along with references to the type files. When the InitialSessionState (ISS) object processes these types it reads the type files again and ends up with duplicate type entries. PowerShell V5.1 ISS type processing was re-written to improve performance and no longer removes duplicate types, so that this scenario (runspace ISS reuse) results in errors causing a regression.
The fix is to copy only type data when a TypeTable is passed to the ISS.
* Improve console cmdlets tests
Main improvements refer to tests of the Write-Host cmdlet.
Original tests:
1. Slow because run external processes
2. Don't test colors and -NoNewLine in fact.
1. The original tests is preserved (deleted one as redundant) but marked
by 'Slow' tag. They is preserved because they actually check the output
on the work, not a test console.
2. Add negative color tests. (Code cover grow!)
3. Add tests based on TestHostCS. This test host has been refined so we
can see colors and a new line in output.
4. Add minor fixes for test modules loads.
Also I add support for Information stream. I originally planned to use
it but not actually used. However, I have left this as a useful addition
for future tests.
I wonder that a Write-Host console output is duplicated in Information
Stream - Is it by design? I left a debug print on this matter in the
test code.
* Fix after code review
* Corrections after code review
Suppress import-module warnings
Rename Describes
Add "-Object" test
Add Stream.Information tests with TestHostCS
* Add checks for Streams.Information and add comments
1. Added parameterbinding test
2. Added ShouldBeErrorID function in helper file
3. Removed ShouldBeErrorID function from other test modules
4. Update New-TestHost to be able to run on full CLR
5. updated file map.json
Paul Higinbotham