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Second, the developer could be assuming the path containing the file they are seeking will always exist as part of the test. Actually, calling the real Test-Path function could cause several issues in testing.įirst, the Test-Path cmdlet itself could have a bug in it, previously undiscovered or maybe just not known to the developer. For example, let’s say your script calls Test-Path to validate the existence of a file. Within a test a mock is used instead calling the actual external function desired. To achieve isolation, testing uses the concept of mocks.

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By isolating the test to run on just the code they’ve written, and not that of external modules, they can be assured any problems they find are with their code and not with external modules or functions. They provide feedback that the code works as they wanted it to. Unit tests are performed by the developer and are typically focused on the code they’ve just created or modified. While there are entire books written around testing concepts, this will be as brief as possible to provide context to basic testing operations. Types of Testingīefore getting into writing tests, I will cover the types of testing. In this series of articles, I’ll introduce Pester and show examples of the different types of tests you can perform. (See the article Pester on PSCore limitations for more information). It is even compatible with the new PowerShell 6.0 Core, running on Linux/Mac OSX platforms, with a few minor limitations. It is compatible with PowerShell 2.x up through 5.x on Windows 10, 8, 7, Vista, and all versions of Windows Server from 2003 through today.

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You’ll find the full project on GitHub.Ī lot of effort went into making Pester as compatible as possible across multiple versions and platforms. It’s open source, you can look through the source code, even make contributions back to it. Pester is a community-based project designed from the ground up as a testing framework for PowerShell, written in PowerShell. From the title of this article, you’ve guessed by now the tool of choice for testing PowerShell code is Pester. Just as automation is the answer to infrastructure management, so too is it the answer to testing. But what about bigger code bases? Modules composed of multiple PS1 files, or scripts that rely on many different modules? A developer may be able to test the small script they created, or the function they updated. Unfortunately, this type of testing just doesn’t scale.

A developer makes changes, runs a test on their computer, and deploys.

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“I test my code.” But in a shockingly high number of environments testing is still a manual process. These and other questions can be answered through the use of testing. “Can you prove to me your scripts do everything they are supposed to?” “How do we know your changes don’t break other modules?” “How can I be confident your code meets requirements?” Given the importance of PowerShell, imagine that your boss, project manager, or similar authority figure comes to you with some basic questions.

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With its usefulness on the Windows platform long established, and now the ability to run on the Linux and Apple Mac OSX platforms, PowerShell has firmly established itself as a powerful player in the world of automation. The DevOps movement has added to the importance of having a good automation strategy.

Advanced Testing of Your PowerShell Code with PesterĪutomation has become the backbone of infrastructure management within most corporations.

Introduction to Testing Your PowerShell Code with Pester.

Like the office in Washington D.C.Introduction to Testing Your PowerShell Code with Pester - Simple Talk Skip to content.

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