$here = Split-Path -Parent $MyInvocation.MyCommand.Path
. "$here\Add-Numbers.ps1"

Describe -Tags "Example" "Add-Numbers" {

    It "adds positive numbers" {
        Add-Numbers 2 3 | Should Be 5
    }

    It "adds negative numbers" {
        Add-Numbers (-2) (-2) | Should Be (-4)
    }

    It "adds one negative number to positive number" {
        Add-Numbers (-2) 2 | Should Be 0
    }

    It "concatenates strings if given strings" {
        Add-Numbers two three | Should Be "twothree"
    }

    It "should not be 0" {
        Add-Numbers 2 3 | Should Not Be 0
    }
}