Boxstarter-Chocolatey-Param-Troubleshooting

Chocolatey.ps1.md

troubleshooting chocolatey/boxstarter#405

I modified function 'choco' in Chocolatey.ps1 to include some additional logging:

function choco {
<#
.SYNOPSIS
Intercepts Chocolatey call to check for reboots

#>
    param(
        [string]$command,
        [string[]]$packageNames=@('')
    )
    Write-BoxstarterMessage "'choco' wrapper: command: '$command' packageNames: $($packageNames | % { "$($_); " })" -Verbose
    Write-BoxstarterMessage "'choco' wrapper: PSBoundParameters: $($PSBoundParameters.Keys | % { "$($_) = $($PSBoundParameters[$_]); " })" -Verbose
    Write-BoxstarterMessage "'choco' wrapper: args: $($args | % { "$($_); " })" -Verbose
    chocolatey @PSBoundParameters @args
}

I created an additional unit-test in Chocolatey.tests.p1 to check if parameters are passed in the correct order ..

Describe "Call-Chocolatey" {
    Mock Invoke-Reboot
    Mock Test-PendingReboot {return $false}
context "package parameters" {
        $script:passedArgs = ""
        $global:VerbosePreference="Continue"
        Mock Invoke-LocalChocolatey { $script:passedArgs = $chocoArgs }

        choco Install -y pkg --source blah --installargs "ADD_CMAKE_TO_PATH=System"
        $passedArgs | Should Be $null

        it "passes expected params" {
            $passedArgs.count | Should Be 8 # actually 7 + 1 "-y" is always appended
        }
        it "passes all parameters in correct order" {
            $passedArgs[0] | Should Be "Install"
            $passedArgs[1] | Should Be "-y"
            $passedArgs[2] | Should Be "pkg"
            $passedArgs[3] | Should Be "--source"
            $passedArgs[4] | Should Be "blah"
            $passedArgs[5] | Should Be "--installargs"
            $passedArgs[6] | Should Be "ADD_CMAKE_TO_PATH=System"
            $passedArgs[7] | Should Be "-y" # mw: why?
        }
    }
}

I would expect the parameters to be passed in the correct order, but somehow --source gets bound as packageNames here is the output of the unittest:

Context package parameters
AUSFÜHRLICH: Boxstarter: 'choco' wrapper: command: 'Install' packageNames: --source; 
AUSFÜHRLICH: Boxstarter: 'choco' wrapper: PSBoundParameters: command = Install;  packageNames = --source; 
AUSFÜHRLICH: Boxstarter: 'choco' wrapper: args: -y;  pkg;  blah;  --installargs;  ADD_CMAKE_TO_PATH=System; 
...
AUSFÜHRLICH: Boxstarter: Passing the following args to Chocolatey: Install --source -y pkg blah --installargs ADD_CMAKE_TO_PATH=System -Verbose -y

how come the parameter order is swapped when function 'choco' is being called?