Assert-DoesNotContain.ps1
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# Copyright 2012 - 2015 Aaron Jensen # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Assert-DoesNotContain { <# .SYNOPSIS Asserts that a collection doesn't contain an object/item. .DESCRIPTION Use's PowerShell's `-contains` operator to check that a collection is missing an object/item. .EXAMPLE Assert-DoesNotContains @( 1, 2, 3 ) 4 Demonstrates how to assert a collection doesn't contain an item. .EXAMPLE Assert-DoesNotContain @( 1, 2, 3 ) 3 'Three is the loneliest number.' Demonstrates how to show your own message if the assertion fails. #> [CmdletBinding()] param( [Parameter(Position=0)] [object] # The collection to check. $Haystack, [Parameter(Position=1)] [object] # The object the collection shouldn't have. $Needle, [Parameter(Position=2)] [string] # A message to show when the assertion fails. $Message ) Set-StrictMode -Version 'Latest' if( $Haystack -contains $Needle ) { Fail "Found '$Needle'. $Message" } } |