# Register an Assertion Operator with Pester
# Copy Add-AssertionOperator [ - Name ] <String> [ - Test ] <ScriptBlock> [ [ - Alias ] <String [ ] > ] [ [ - InternalName ] <String> ]
[ - SupportsArrayInput ] [ <CommonParameters> ]
# This function allows you to create custom Should assertions.
# # Copy function BeAwesome ( $ActualValue , [switch] $Negate )
{
[bool] $succeeded = $ActualValue -eq 'Awesome'
if ( $Negate ) { $succeeded = -not $succeeded }
if ( -not $succeeded )
{
if ( $Negate )
{
$failureMessage = "{ $ActualValue } is Awesome"
}
else
{
$failureMessage = "{ $ActualValue } is not Awesome"
}
}
return New-Object psobject - Property @ {
Succeeded = $succeeded
FailureMessage = $failureMessage
}
}
Add-AssertionOperator - Name BeAwesome `
- Test $function :BeAwesome `
- Alias 'BA'
PS C:\> "bad" | should - BeAwesome
{ bad } is not Awesome
# # The name of the assertion.
This will become a Named Parameter of Should.
Copy Type : String
Parameter Sets : (All)
Aliases :
Required : True
Position : 1
Default value : None
Accept pipeline input : False
Accept wildcard characters : False
# The test function.
The function must return a PSObject with a [Bool]succeeded and a [string]failureMessage property.
Copy Type : ScriptBlock
Parameter Sets : (All)
Aliases :
Required : True
Position : 2
Default value : None
Accept pipeline input : False
Accept wildcard characters : False
# A list of aliases for the Named Parameter.
Copy Type : String [ ]
Parameter Sets : (All)
Aliases :
Required : False
Position : 3
Default value : @()
Accept pipeline input : False
Accept wildcard characters : False
# If -Name is different from the actual function name, record the actual function name here.
Used by Get-ShouldOperator to pull function help.
Copy Type : String
Parameter Sets : (All)
Aliases :
Required : False
Position : 4
Default value : None
Accept pipeline input : False
Accept wildcard characters : False
# Does the test function support the passing an array of values to test.
Copy Type : SwitchParameter
Parameter Sets : (All)
Aliases :
Required : False
Position : Named
Default value : False
Accept pipeline input : False
Accept wildcard characters : False
# This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters .
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