First off, big thanks go to 🐦Ryan Ephgrave, an incredibly talented and easy to work with PowerShell and dotnet god I have the pleasure to learn from over at #BigBank™ (its a great thing LinkedIn doesn’t exist…)

We had a situation arise recently where we needed to create some Integration tests in Pester to validate a long list of web pages to be sure they responded after a deployment.  I started out manually writing a litany of Pester tests by hand like this:

Context 'Post Deployment Validation' {
    It 'Website #1 should be accessible' {
        $url = 'https://someserver:someport/someEndpoint'
        $results = Invoke-WebRequest -Uri $url -UseDefaultCredentials
        $results.StatusCode | should be 200
    }

    It 'Website #2 should be accessible' {
        $url = 'https://someOtherserver:someport/someEndpoint'
        $results = Invoke-WebRequest -Uri $url -UseDefaultCredentials
        $results.StatusCode | should be 200
    }[...]
}

I spoke with the team about what I was doing and Ryan drew my attention to the very neat TestCases of Pester, which you can read more about here.

With a bit of work, I converted my long list of tests (which I typed by hand…why?  Because I finally got a PS4 and I stayed up too late playing Sekiro!) into a JSON file like this.

[
    {
        "SiteName" : "Our Home Page",
        "Url" : "https://someserver:someport/someEndpoint"        
    },
    {
        "SiteName" : "Our WebApp #1",
        "Url" : "https://someOtherserver:someport/someEndpoint"        
    }
]

Then to hook this up to our Pester test from before and… Continue reading →