How to write Pester Unit Test for ranges of values with multiple decimals

Question

I have a PowerShell function that returns value with multiple decimals from a range of values. How do I write Pester unit test for this kind of function. This kind of function is used to check version of some of applications like Outlook.

function randomVersion{
    $randomVersion= Get-Random -InputObject '14.1.3.5397', '14.2.3.5399', '15.4.2.1327', '15.5.2.1328', '16.3.7.9437', '16.7.7.9438'
    return $randomVersion
}

Answer 1

Any way you like, depending on what exactly you want to test - Pester is Powershell code, so you could do a regex match on the string pattern:

randomVersion | should -Match -RegularExpression '^(14|15|16)\.[0-9]+\.[0-9]+\.[0-9]+$'

Or you could write more code around it to test more things, e.g.

function randomVersion
{
    Get-Random -InputObject '1', 'test', '14.1.3.5397', '14.2.3.5399', '15.4.2.1327', '15.5.2.1328', '16.3.7.9437', '16.7.7.9438'
}

Import-Module -Name Pester

Describe "Tests for randomVersion" {

    It "works" {

        $result = randomVersion 

        $version = $result -as [version]
        $version | Should -not -BeNullOrEmpty

        if ($version)
        {
            $version.Major | Should -BeIn 14, 15, 16
        }
    }
}