. $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 "Start-ServicesByTier" {

    Mock -ModuleName $moduleForMock -CommandName Get-ServicesByTier -MockWith { return @("Fake.Service.One", "Fake.Service.Two") }
    Mock -ModuleName $moduleForMock -CommandName Start-ServicesInParallel
    Mock -ModuleName $moduleForMock -CommandName Test-IsCollectionNullOrEmpty -MockWith { return @("Fake.Service.One", "Fake.Service.Two") }
    Mock -ModuleName $moduleForMock -CommandName Get-Service
    Mock -ModuleName $moduleForMock -CommandName Write-Warning
    Mock -ModuleName $moduleForMock -CommandName Write-Host

    Context "Start services by tier with different parameters" {

        It "Assert Get-ServicesByTier called with -IncludeLowerTiers" {

            Start-ServicesByTier -Tier 2 -IncludeLowerTiers
            Assert-MockCalled -CommandName Get-ServicesByTier -Times 1 -Exactly -Scope It -ModuleName $moduleForMock -ParameterFilter { $IncludeLowerTiers -match $null }
        }

        It "Assert Get-ServicesByTier called without -IncludeLowerTiers" {

            Start-ServicesByTier -Tier 2
            Assert-MockCalled -CommandName Get-ServicesByTier -Times 1 -Exactly -Scope It -ModuleName $moduleForMock -ParameterFilter { $IncludeLowerTiers -match $null }
        }

    }

    Context "Start services by tier foreach logic output" {

        It "Assert Start-ServicesInParallel with Tier 0" {

            Mock -ModuleName $moduleForMock -CommandName Get-ServicesByTier -MockWith { return @("Fake.Service.One") }
            Mock -ModuleName $moduleForMock -CommandName Test-IsCollectionNullOrEmpty -MockWith { return $false }
            Mock -ModuleName $moduleForMock -CommandName Get-Service -MockWith { return @{ Status = "Stopped" } }

            Start-ServicesByTier -Tier 0
            Assert-MockCalled -CommandName Start-ServicesInParallel -Times 1 -Exactly -Scope It -ModuleName $moduleForMock -ParameterFilter { $ServiceNamestoStart -match "Fake.Service.One" }
        }
    }
}