gitstfile1.tests.ps1

$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.Tests\.', '.' 
. "$here\$sut"

Describe "IsEvenNumber" {
    Context "When an even number is passed to the function" {

        $result = IsEvenNumber(42)

        It "Returns true" {
            $result | Should Be $true
        }
    }

    Context "When an uneven number is passed to the function" {

        $result = IsEvenNumber(1337)

        It "Returns false" {
            $result | Should Be $false
        }
    }
}