![]() These test cases are fed to Pester's it block using the TestCases parameter. In this case, I'm checking the object type that's returned, but this can be anything. Inside of each of these hashtables contains the parameter I'll be passing to New-TextFile as well as an expected result I'll be testing. You can see that I have created an array called $testCases that contains two hashtables. These are two test cases and be setup like the following: $testCases = 'foo' It is a BDD (behavior driven design) framework. For example, in this situation, I'd like to run some tests to ensure my function follows each of the two code paths it has: when Name is foo and when it is not. Pester is the framework for testing your powershell scripts, functions and modules. Because of this proxy PSBoundParameters will be overwritten and are not available inside your mock's scriptblock. Test cases work great when testing a function that has various input parameters. PesterBoundParameters Calling a mocked command will execute a proxy-function (hook) which evaluates and chooses the correct behavior/mock to invoke in that scenario. ' You can use the comma operator, to make your test succeed but note that Should is meant testing the type of an element not to test an array as a whole. The first task is building the code to test for this scenario. Arrays are enumerated when passed through the pipeline, in your example Should is comparing the type of each element of the array and not the array as a whole: '.but got 2 with type int. If the service is stopped, that's a problem, and you'd like to know about it. To use an example, let's say you have a Windows service that you expect to be running on all of your servers. For this example, I'll use Pester's test cases functionality. Pester can test for anything PowerShell can read. Pester can be run locally, where it integrates well with Visual Studio Code, and it can of course be integrated into a build script in a CI pipeline. This includes functions, Cmdlets, Modules and scripts. Best practice would dictate adding some validation to the Name parameter but let's pretend we're not doing that for now.īecause it's possible for the Name parameter to contain some different strings, I'll need to create some tests for each scenario. Pester tests can execute any command or script that is accessible to a Pester test file. For example, in this situation, I'd like to run some tests to ensure my function follows each of the two code paths it has: when Name is foo and when it is not. Test cases work great when testing a function that has various input parameters. ![]() ![]() Using -ForEach & -TestCases with hashtable The most common usage of data driven tests is providing multiple examples to a single It. Apparently, a lot of these examples won't work for a file name. For this example, I'll use Pester's test cases functionality. This can range from providing multiple examples on a single It, to generating whole set of tests based on an external configuration file. This module includes the Pester tests below. Name could be foo, -, hhh$$$~~~~~// and so on. As an example, let’s say we have a PowerShell module with the structure above. Since the Name parameter is a string and has no parameter validation, it can be quite some things.
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