Pester

4.10.2-beta1

Functions/Get-ShouldOperator.ps1

                                function Get-ShouldOperator {

    <#

    .SYNOPSIS

    Display the assertion operators available for use with Should.

    .DESCRIPTION

    Get-ShouldOperator returns a list of available Should parameters,

    their aliases, and examples to help you craft the tests you need.

    Get-ShouldOperator will list all available operators,

    including any registered by the user with Add-AssertionOperator.

    .NOTES

    Pester uses dynamic parameters to populate Should arguments.

    This limits the user's ability to discover the available assertions via

    standard PowerShell discovery patterns (like `Get-Help Should -Parameter *`).

    .EXAMPLE

    Get-ShouldOperator

    Return all available Should assertion operators and their aliases.

    .EXAMPLE

    Get-ShouldOperator -Name Be

    Return help examples for the Be assertion operator.

    -Name is a dynamic parameter that tab completes all available options.

    .LINK

    https://pester.dev/docs/commands/Should

    #>

    [CmdletBinding()]

    param ()

    # Use a dynamic parameter to create a dynamic ValidateSet

    # Define parameter -Name and tab-complete all current values of $AssertionOperators

    # Discovers included assertions (-Be, -Not) and any registered by the user via Add-AssertionOperator

    # https://martin77s.wordpress.com/2014/06/09/dynamic-validateset-in-a-dynamic-parameter/

    DynamicParam {

        $ParameterName = 'Name'

        $RuntimeParameterDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary

        $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]

        $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute

        $AttributeCollection.Add($ParameterAttribute)

        $arrSet = $AssertionOperators.Values |

        Select-Object -Property Name, Alias |

        ForEach-Object { $_.Name; $_.Alias }

        $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($arrSet)

        $AttributeCollection.Add($ValidateSetAttribute)

        $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParameterName, [string], $AttributeCollection)

        $RuntimeParameterDictionary.Add($ParameterName, $RuntimeParameter)

        return $RuntimeParameterDictionary

    }

    BEGIN {

        # Bind the parameter to a friendly variable

        $Name = $PsBoundParameters[$ParameterName]

    }

    END {

        if ($Name) {

            $operator = $AssertionOperators.Values | Where-Object { $Name -eq $_.Name -or $_.Alias -contains $Name }

            $help = Get-Help $operator.InternalName -Examples -ErrorAction SilentlyContinue

            if (($help | Measure-Object).Count -ne 1) {

                Write-Warning ("No help found for Should operator '{0}'" -f ((Get-AssertionOperatorEntry $Name).InternalName))

            }

            else {

                $help

            }

        }

        else {

            $AssertionOperators.Keys | ForEach-Object {

                $aliases = (Get-AssertionOperatorEntry $_).Alias

                # Return name and alias(es) for all registered Should operators

                New-Object -TypeName PSObject -Property @{

                    Name  = $_

                    Alias = $aliases -join ', '

                }

            }

        }

    }

}

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# SIG # End signature block