PowerShell/test/powershell/Write-Stream.Tests.ps1

Describe "Stream writer tests" {
    $targetfile = "writeoutput.txt"

    # A custom function is defined here do handle the debug stream dealing with the confirm prompt
    # that would normally
    function Write-Messages
    {
        [CmdletBinding()]

        param()
        If ($PSBoundParameters['Debug']) { $DebugPreference = 'Continue' }
        Write-Verbose "Verbose message"

        Write-Debug "Debug message"

    }

    function Get-OutputResults
    {
        # Get the contents of the targetfile.
        # Make the array a string for less brittle testing
        $output = $(Get-Content $args[0])
        [String]::Join([Environment]::NewLine, $output )

        return $output
    }
    Context "Redirect Stream Tests" {
        # These tests validate that a stream is actually being written to by redirecting the output of that stream

        AfterEach { Remove-Item $targetfile }
        It "Should write warnings to the warning stream" -Pending:($env:TRAVIS_OS_NAME -eq "osx") {
            Write-Warning "Test Warning" 3>&1 > $targetfile

            Get-Content $targetfile | Should Be "Test Warning"
        }

        It "Should write error messages to the error stream" -Pending:($env:TRAVIS_OS_NAME -eq "osx") {
            Write-Error "Testing Error" 2>&1 > $targetfile

            $result = Get-OutputResults $targetfile
            # The contents of the error stream should contain the expected text
            $result -match ": Testing Error" | Should Be $true
        }

        It "Should write debug messages to the debug stream" -Pending:($env:TRAVIS_OS_NAME -eq "osx") {
            Write-Messages -Debug -EA SilentlyContinue 5>&1 > $targetfile

            $result = Get-OutputResults $targetfile

            # The contents of the debug stream should contain the expected text
            $result -match "Debug Message" | Should Be $true
        }

        It "Should write messages to the verbose stream" -Pending:($env:TRAVIS_OS_NAME -eq "osx") {
            Write-Messages -Verbose 4>&1 > $targetfile

            $result = Get-OutputResults $targetfile

            # The contents of the debug stream should contain the expected text
            $result -match "Verbose Message" | Should Be $true
        }
    }

    Context "Error automatic variable" {
        It "Should write error messages to the `$Error automatic variable" {
            Write-Error "Test Error Message" -ErrorAction SilentlyContinue

            $Error[0] | Should Match "Test Error Message"
        }
    }
}