Describe 'Test case when Chocolatey is not installed' {
    BeforeEach {
        # Function we're testing
        function Test-ChocolateyAvailability {
            if ($null -eq (Get-Command -Name 'choco.exe' -ErrorAction SilentlyContinue)) {
                Write-Error "Chocolatey not installed. Cannot install standard packages." -ErrorAction Stop
            }
            return $true
        }

        # Mock Get-Command to simulate Chocolatey not being installed
        Mock Get-Command { return $null } -ParameterFilter { $Name -eq 'choco.exe' }
    }

    It 'Throws an error when Chocolatey is not found' {
        { Test-ChocolateyAvailability } | Should -Throw
    }

    It 'Throws the correct error message' {
        $expectedMessage = "Chocolatey not installed. Cannot install standard packages."
        { Test-ChocolateyAvailability } | Should -Throw $expectedMessage
    }

    It 'Should call Get-Command with correct parameters' {
        try {
            Test-ChocolateyAvailability
        } catch {
            # Ignore the expected error
        }
        Should -Invoke Get-Command -Times 1 -ParameterFilter { 
            $Name -eq 'choco.exe' -and 
            $ErrorAction -eq 'SilentlyContinue' 
        }
    }
}