powershell - Null List in Pester Mock created from a closure -


why following code:

  function createexecutedcommandslogger(){      param(         [system.collections.generic.list[system.string]]$cmdlog      )      "wwwww=>{0}" -f $cmdlog | write-host      return{         param(            [parameter(valuefrompipeline)]$command         )         "xxxxx=>{0}" -f $command | write-host         "yyyyy=>{0}" -f $cmdlog | write-host         $cmdlog.add($command)      }.getnewclosure()   }    $executedcommands = new-object system.collections.generic.list[system.string]   mock executesqlcommand (createexecutedcommandslogger $executedcommands)

result in error:

  runtimeexception: cannot call method on null-valued expression.   @ <scriptblock>, <no file>: line 7   @ <scriptblock>, c:\users\notme\documents\windowspowershell\modules\pester\functions\mock.ps1: line 1018   @ executeblock, c:\users\notme\documents\windowspowershell\modules\pester\functions\mock.ps1: line 1022   @ invoke-mock, c:\users\notme\documents\windowspowershell\modules\pester\functions\mock.ps1: line 868   @ <scriptblock><process>, <no file>: line 53

for reference tracing output gives:

wwwww=>system.collections.generic.list`1[system.string] xxxxx=>c:\dummy\command.exe -s "blah" -d "blahblah" -i "something.sql" yyyyy=>

when use following, works:

  $dummymock = (createexecutedcommandslogger $executedcommands)   &$dummymock "blah"

i'm assuming way script block in mock executed?

as can see source (get-command mock).scriptblock, there single line $mockwith parameter used:

$mockwithcopy = [scriptblock]::create($mockwith.tostring())

so that, $mockwith string , closure ignored. done because on next line newly created script block $mockwithcopy bounded session state, loose closure anyway:

set-scriptblockscope -scriptblock $mockwithcopy -sessionstate $contextinfo.session

pester first private copy of script block not affect passed instance.


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