. $PSScriptRoot\..\..\Load-PesterModules.ps1
$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.tests\.', '.'
$functionPath = Join-Path -Path $here -ChildPath $sut
Write-Host "Overriding SUT: $functionPath"
Import-Module $functionPath -Force
$moduleForMock = ""

Describe "Main" {

    $FAKE_ALKAMI_INSTALLATION_DRIVE = "A:"
    $FAKE_SYSTEM_DRIVE = "T:"
    Mock -CommandName Get-LogLeadName -ModuleName $moduleForMock -MockWith {}
    Mock -CommandName Write-Host -ModuleName $moduleForMock -MockWith {}
    Mock -CommandName Write-Warning -ModuleName $moduleForMock -MockWith {}
    Mock -CommandName Write-Error -ModuleName $moduleForMock -MockWith {}
    Mock -CommandName Get-EnvironmentVariable -ModuleName $moduleForMock -MockWith {}

    Context "Happy_Path" {
        It "Should_call_Get-LogLeadName" {
            $result = Get-AlkamiInstallationDrive
            Assert-MockCalled -CommandName Get-LogLeadName -Times 1 -Scope It
        }

        It "Should_get_ALKAMI_INSTALLATION_DRIVE_env_var" {
            Mock -CommandName Get-EnvironmentVariable -ModuleName $moduleForMock -ParameterFilter { $Name -eq 'ALKAMI_INSTALLATION_DRIVE' } -MockWith { return $FAKE_ALKAMI_INSTALLATION_DRIVE }

            $result = Get-AlkamiInstallationDrive
            Assert-MockCalled -CommandName Get-EnvironmentVariable -Times 1 -Exactly -Scope It
            Assert-MockCalled -CommandName Get-EnvironmentVariable -ParameterFilter { $Name -eq 'ALKAMI_INSTALLATION_DRIVE' } -Times 1 -Scope It
            Assert-MockCalled -CommandName Get-EnvironmentVariable -ParameterFilter { $Name -eq 'SystemDrive' } -Times 0 -Exactly -Scope It
            $result | Should -Be $FAKE_ALKAMI_INSTALLATION_DRIVE
        }

    }
    Context "Unhappy_Path" {
        It "Uses_SystemDrive_When_ALKAMI_INSTALLATION_DRIVE_is_nullorempty" {
            Mock -CommandName Get-EnvironmentVariable -ModuleName $moduleForMock -ParameterFilter { $Name -eq 'ALKAMI_INSTALLATION_DRIVE' } -MockWith { return $null }
            Mock -CommandName Get-EnvironmentVariable -ModuleName $moduleForMock -ParameterFilter { $Name -eq 'SystemDrive' } -MockWith { return $FAKE_SYSTEM_DRIVE }

            $result = Get-AlkamiInstallationDrive
            Assert-MockCalled -CommandName Get-EnvironmentVariable -Times 2 -Exactly -Scope It
            Assert-MockCalled -CommandName Get-EnvironmentVariable -ParameterFilter { $Name -eq 'SystemDrive' } -Times 1 -Exactly -Scope It
            $result | Should -Be $FAKE_SYSTEM_DRIVE
        }

    }
}