Describe "Alias tests" -Tags "CI" {

    BeforeAll {
        $testPath = Join-Path testdrive:\ ("testAlias\[.test")
        New-Item -ItemType Directory -Path $testPath -Force | Out-Null

        class TestData 
        {
            [string] $testName
            [string] $testFile
            [string] $expectedError
            
            TestData($name, $file, $error)
            {
                $this.testName = $name
                $this.testFile = $file
                $this.expectedError = $error
            }            
        }
    }

    Context "Export-Alias literal path" {
        BeforeAll {
            $csvFile = Join-Path $testPath "alias.csv"
            $ps1File = Join-Path $testPath "alias.ps1"

            $testCases = @()
            $testCases += [TestData]::new("CSV", $csvFile, [NullString]::Value)
            $testCases += [TestData]::new("PS1", $ps1File, [NullString]::Value)
            $testCases += [TestData]::new("Empty string", "", "ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.ExportAliasCommand")
            $testCases += [TestData]::new("Null", [NullString]::Value, "ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.ExportAliasCommand")
            $testCases += [TestData]::new("Non filesystem provider", 'cert:\alias.ps1', "ReadWriteFileNotFileSystemProvider,Microsoft.PowerShell.Commands.ExportAliasCommand")
        }
    
        $testCases | % {
                    
            It "for $($_.testName)" {

                $test = $_
                try
                {
                    Export-Alias -LiteralPath $test.testFile -ErrorAction SilentlyContinue
                }
                catch
                {
                    $exportAliasError = $_
                }

                if($test.expectedError -eq $null)
                {
                    Test-Path -LiteralPath $test.testFile | Should Be $true                    
                }
                else
                {
                    $exportAliasError.FullyqualifiedErrorId | Should Be $test.expectedError
                }
            }

            AfterEach {
                Remove-Item -LiteralPath $test.testFile -Force -ErrorAction SilentlyContinue
            }
        }
    
        It "when file exists with NoClobber" {
            Export-Alias -LiteralPath $csvFile

            try
            {
                Export-Alias -LiteralPath $csvFile -NoClobber
            }
            catch
            {
                $exportAliasError = $_
            }

            $exportAliasError.FullyQualifiedErrorId | Should Be "NoClobber,Microsoft.PowerShell.Commands.ExportAliasCommand"
        }
    }

    Context "Export-All inside a literal path" {
        BeforeEach {
            Push-Location -LiteralPath $testPath
        }
        
        It "with a CSV file" {
            Export-Alias "alias.csv"
            Test-Path -LiteralPath (Join-Path $testPath "alias.csv") | Should Be $true
        }

        It "with NoClobber" {
            $path = Export-Alias alias.csv

            try
            {
                Export-Alias alias.csv -NoClobber
            }
            catch
            {
                $exportAliasError = $_
            }

            $exportAliasError.FullyQualifiedErrorId | Should Be "NoClobber,Microsoft.PowerShell.Commands.ExportAliasCommand"
        }

        AfterEach { 
            Pop-Location
        }
    }

    Context "Import-Alias literal path" {

        BeforeAll {
            $csvFile = Join-Path $testPath "alias.csv"
            $ps1File = Join-Path $testPath "alias.ps1"

            $testCases = @()
            $testCases += [TestData]::new("Empty string", "", "ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.ImportAliasCommand")
            $testCases += [TestData]::new("Null", [NullString]::Value, "ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.ImportAliasCommand")
            $testCases += [TestData]::new("Non filesystem provider", 'cert:\alias.ps1', "NotSupported,Microsoft.PowerShell.Commands.ImportAliasCommand")
        }
    
        $testCases | % {
                    
            It "for $($_.testName)" {
                $test = $_
                
                try
                {
                    Import-Alias -LiteralPath $test.testFile -ErrorAction SilentlyContinue
                }
                catch
                {
                    $exportAliasError = $_
                }
                
                $exportAliasError.FullyqualifiedErrorId | Should Be $test.expectedError                
            }
        }

        It "can be done from a CSV file" {

            # alias file definition content
            $aliasDefinition = @'
            "myuh","update-help","","ReadOnly, AllScope"
'@

            $aliasFile = Join-Path $testPath "alias.csv"
            $aliasDefinition | Out-File -LiteralPath $aliasFile

            Import-Alias -LiteralPath $aliasFile
            
            # Verify that the alias was imported
            $definedAlias = Get-Alias myuh         

            $definedAlias | Should Not Be $null
            $definedAlias.Name | Should Be "myuh"
            $definedAlias.Definition | Should Be "update-help"
        }
    }
}