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Imagine typing out a series of steps in plain English that would reflect a list of actions a human QA tester would undertake to test an app, then turning that list into an automated testing script.

Columnist Daniel Gilbert wasn't satisfied with AdWords' native A/B testing capabilities, so he and his team wrote a script.

Notice that Invoke-Pester itself is using a single parameter called Script while all of the test script parameters are defined by a Parameters key inside of that hashtable. Once you've parameterized ...

To test the value of numbers, you can use any of the tests shown in the script below (e.g., -eq tests for equality). The script asks for you to enter two numbers and then runs the series of tests.

IBM's John Jackson advises companies to skip the script and instead conduct disaster recovery tests on a moment's notice.

The (narrow but very important) problem: Test scripts used for version 1.0 of an application will probably break when applied to version 2.