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0.3.0-preview

tests/Resolve-DFPackageManager.Tests.ps1

BeforeAll {
    . "$PSScriptRoot/../Private/Resolve-DFPackageManager.ps1"
}

Describe 'Resolve-DFPackageManager' {
    BeforeEach { $script:DFPackageManagers = $null }

    It 'returns only managers found on PATH' {
        Mock Get-Command { if ($Name -eq 'scoop') { [PSCustomObject]@{ Name = 'scoop' } } else { $null } }
        $result = Resolve-DFPackageManager
        $result | Should -Contain 'scoop'
        $result | Should -Not -Contain 'winget'
        $result | Should -Not -Contain 'choco'
    }

    It 'returns empty array when no managers are found' {
        Mock Get-Command { $null }
        $result = Resolve-DFPackageManager
        @($result).Count | Should -Be 0
    }

    It 'caches result on second call (Get-Command not called again)' {
        Mock Get-Command { [PSCustomObject]@{ Name = $Name } } -Verifiable
        Resolve-DFPackageManager | Out-Null
        Resolve-DFPackageManager | Out-Null
        # Get-Command should only be called for the first invocation (3 PMs)
        Should -Invoke Get-Command -Times 3 -Exactly
    }

    It 'reloads when -Force is specified' {
        Mock Get-Command { $null }
        Resolve-DFPackageManager | Out-Null  # caches empty
        Mock Get-Command { [PSCustomObject]@{ Name = 'scoop' } } -ParameterFilter { $Name -eq 'scoop' }
        $result = Resolve-DFPackageManager -Force
        $result | Should -Contain 'scoop'
    }

    It 'respects custom -Priority order' {
        Mock Get-Command { [PSCustomObject]@{ Name = $Name } }
        $result = Resolve-DFPackageManager -Priority @('winget', 'scoop')
        @($result)[0] | Should -Be 'winget'
        @($result)[1] | Should -Be 'scoop'
        @($result).Count | Should -Be 2
    }
}