Describe "Export-Alias DRT Unit Tests" -Tags DRT{
    $testAliasDirectory = Join-Path -Path $TestDrive -ChildPath ExportAliasTestDirectory
    $testAliases        = "TestAliases"
    $fulltestpath       = Join-Path -Path $testAliasDirectory -ChildPath $testAliases

    BeforeEach {
		New-Item -Path $testAliasDirectory -ItemType Directory -Force
		remove-item alias:abcd* -force
		remove-item alias:ijkl* -force
		set-alias abcd01 efgh01
		set-alias abcd02 efgh02
		set-alias abcd03 efgh03
		set-alias abcd04 efgh04
		set-alias ijkl01 mnop01
		set-alias ijkl02 mnop02
		set-alias ijkl03 mnop03
		set-alias ijkl04 mnop04
    }
	
	AfterEach {
		Remove-Item -Path $testAliasDirectory -Recurse -Force
	}

    It "Export-Alias for exist file should work"{
		New-Item -Path $fulltestpath -ItemType File -Force
		{Export-Alias $fulltestpath}| Should Not Throw
    }
	
	It "Export-Alias Resolve To Multiple will throw PSInvalidOperationException" {	
		try {
			Export-Alias *
			Throw "Execution OK"
		} 
		catch {
			$_.FullyQualifiedErrorId | Should be "ReadWriteMultipleFilesNotSupported,Microsoft.PowerShell.Commands.ExportAliasCommand"
		}
	}
	
	It "Export-Alias with Invalid Scope will throw PSArgumentException" {	
		try {
			Export-Alias $fulltestpath -scope foobar
			Throw "Execution OK"
		} 
		catch {
			$_.FullyQualifiedErrorId | Should be "Argument,Microsoft.PowerShell.Commands.ExportAliasCommand"
		}
	}

	It "Export-Alias for Default"{
		Export-Alias $fulltestpath abcd01 -passthru
		$fulltestpath| Should ContainExactly '"abcd01","efgh01","","None"'
    }
	
	It "Export-Alias As CSV"{
		Export-Alias $fulltestpath abcd01 -As CSV -passthru
		$fulltestpath| Should ContainExactly '"abcd01","efgh01","","None"'
    }
	
	It "Export-Alias As CSV With Description"{
		Export-Alias $fulltestpath abcd01 -As CSV -description "My Aliases" -passthru
		$fulltestpath| Should ContainExactly '"abcd01","efgh01","","None"'
		$fulltestpath| Should ContainExactly "My Aliases"
    }
	
	It "Export-Alias As CSV With Multiline Description"{
		Export-Alias $fulltestpath abcd01 -As CSV -description "My Aliases\nYour Aliases\nEveryones Aliases" -passthru
		$fulltestpath| Should ContainExactly '"abcd01","efgh01","","None"'
		$fulltestpath| Should ContainExactly "My Aliases"
		$fulltestpath| Should ContainExactly "Your Aliases"
		$fulltestpath| Should ContainExactly "Everyones Aliases"
    }
	
	It "Export-Alias As Script"{
		Export-Alias $fulltestpath abcd01 -As Script -passthru
		$fulltestpath| Should ContainExactly 'set-alias -Name:"abcd01" -Value:"efgh01" -Description:"" -Option:"None"'
    }
	
	It "Export-Alias As Script With Multiline Description"{
		Export-Alias $fulltestpath abcd01 -As Script -description "My Aliases\nYour Aliases\nEveryones Aliases" -passthru
		$fulltestpath| Should ContainExactly 'set-alias -Name:"abcd01" -Value:"efgh01" -Description:"" -Option:"None"'
		$fulltestpath| Should ContainExactly "My Aliases"
		$fulltestpath| Should ContainExactly "Your Aliases"
		$fulltestpath| Should ContainExactly "Everyones Aliases"
    }
	
	It "Export-Alias for Force Test"{
		Export-Alias $fulltestpath abcd01
		Export-Alias $fulltestpath abcd02 -force
		$fulltestpath| Should Not ContainExactly '"abcd01","efgh01","","None"'
		$fulltestpath| Should ContainExactly '"abcd02","efgh02","","None"'
    }
	
	It "Export-Alias for Force ReadOnly Test" {
		Export-Alias $fulltestpath abcd01
		if ( $IsWindows )
		{
			attrib +r $fulltestpath
		}
		else
		{
			chmod 444 $fulltestpath
		}
		
		try{
			Export-Alias $fulltestpath abcd02
		}
		catch{
			$_.FullyQualifiedErrorId | Should be "FileOpenFailure,Microsoft.PowerShell.Commands.ExportAliasCommand"
		}
		Export-Alias $fulltestpath abcd03 -force
		$fulltestpath| Should Not ContainExactly '"abcd01","efgh01","","None"'
		$fulltestpath| Should Not ContainExactly '"abcd02","efgh02","","None"'
		$fulltestpath| Should ContainExactly '"abcd03","efgh03","","None"'
		
		if ( $IsWindows )
		{
			attrib -r $fulltestpath
		}
		else
		{
			chmod 777 $fulltestpath
		}
		
    }
}

Describe "Export-Alias" {
    $testAliasDirectory = Join-Path -Path $TestDrive -ChildPath ExportAliasTestDirectory
    $testAliases        = "TestAliases"
    $fulltestpath       = Join-Path -Path $testAliasDirectory -ChildPath $testAliases

    BeforeEach {
	New-Item -Path $testAliasDirectory -ItemType Directory -Force
    }

    It "Should be able to create a file in the specified location"{
	Export-Alias $fulltestpath

	Test-Path $fulltestpath | Should be $true
    }

    It "Should create a file with the list of aliases that match the expected list" {
	Export-Alias $fulltestpath

	Test-Path $fulltestpath | Should Be $true

	$actual   = Get-Content $fulltestpath | Sort-Object
	$expected = Get-Command -CommandType Alias
	
	for ( $i=0; $i -lt $expected.Length; $i++)
	{
	    # We loop through the expected list and not the other because the output writes some comments to the file.
	    $expected[$i] | Should Match $actual[$i].Name
	}

    }

    Remove-Item -Path $testAliasDirectory -Recurse -Force
}