function-Get-PodcastImage.Tests.ps1

Describe 'Get-PodcastImage' {


    BeforeAll {
        . $PSScriptRoot\function-Get-PodcastImage.ps1
        $TestData = (Get-Content $PSScriptRoot\ObjectMother\RSSData.json -Raw | ConvertFrom-Json) | ForEach-Object {
            @{
                Data     = $_
                ImageURL = $_.ImageURL
                Exist    = [int][bool]($i++ % 2) # makes odd indexes return false for exist
            }
        }
    }

    it 'should download <imageUrl> <exist> times' -TestCases $TestData[0..1] {
        param(
            $Data, $ImageUrl, $Exist
        )

        # Arrange
        mock Invoke-WebRequest

        $File = Split-Path $ImageUrl -Leaf

        mock Test-Path -ParameterFilter { $Path -eq "C:\Temp\$File" } { !([Bool]$Exist) }

        # Act
        $null = Get-PodcastImage -rssData $Data -OutputPathFolder 'C:\Temp'


        # Assert
        Assert-MockCalled Invoke-WebRequest -ParameterFilter { $Uri -eq $ImageUrl -and $OutFile -eq "C:\Temp\$File" } -Times $exist -Exactly -Scope It
    }

    it 'should define parameter rssData as mandatory and as pipeline input' {
        $Command = Get-Command Get-PodcastImage

        $Command.Parameters["rssData"].Attributes.Mandatory | Should -BeTrue
        $Command.Parameters["rssData"].Attributes.ValueFromPipeline | Should -BeTrue
        $Command.Parameters["rssData"].Attributes.ValueFromPipelineByPropertyName | Should -BeTrue
    }
}