Functions/Assert-GreaterThan.ps1

# 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-GreaterThan
{
    <#
    .SYNOPSIS
    Asserts that a value is greater than another object.
 
    .DESCRIPTION
    Uses PowerShell's `-gt` operator to determine if `$InputObject -gt $LowerBound`.
 
    .EXAMPLE
    Assert-GreaterThan 5 1
 
    Demonstrates how to check if 5 is greater than 1, which it is, so this assertion passes.
 
    .EXAMPLE
    Assert-GreaterThan $Error.Count 5 'Not enough errors were thrown.'
 
    Demonstrates how to use the message parameter to give an explanation of why the assertion fails.
    #>

    [CmdletBinding()]
    param(
        [Parameter(Position=0)]
        [object]
        # The value to test.
        $InputObject, 

        [Parameter(Position=1)]
        [object]
        # The lower bound for `InputObject`.
        $LowerBound, 

        [Parameter(Position=2)]
        [string]
        # A description of why the assertion might fail.
        $Message
    )

    Set-StrictMode -Version 'Latest'

    if( -not ($InputObject -gt $LowerBound ) )
    {
        Fail "'$InputObject' is not greater than '$LowerBound': $message"
    }
}