Pester testing framework basics in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Pester in PowerShell?

Pester is a testing framework for PowerShell scripts. It helps you write tests to check if your scripts work as expected.

beginner

What is a Describe block in Pester?

A Describe block groups related tests together. Think of it like a chapter title for your tests.

beginner

What does the It block do in Pester?

An It block contains a single test. It describes what the test should check, like a small task or question.

beginner

How do you check if a value equals another in Pester?

Use the Should keyword with the -Be operator. For example: $result | Should -Be 5 checks if $result equals 5.

beginner

How do you run Pester tests in PowerShell?

Run the command Invoke-Pester in the folder with your test files. It runs all tests and shows results.

What keyword starts a group of tests in Pester?

A Should

B It

C Describe

D Test

Describe groups related tests together in Pester.

Which block contains a single test in Pester?

A It

B Test-Case

C Should

D Describe

It block holds one test case in Pester.

How do you assert that a value equals 10 in Pester?

A Assert-Equal $value 10

B $value | Should -Equal 10

C $value -eq 10

D $value | Should -Be 10

Use Should -Be to check equality in Pester.

Which command runs all Pester tests in the current folder?

A Run-Pester

B Invoke-Pester

C Start-Test

D Test-Invoke

Invoke-Pester runs Pester tests.

What is the main purpose of Pester?

A To test PowerShell scripts

B To write PowerShell scripts

C To deploy PowerShell scripts

D To debug PowerShell scripts

Pester is used to test PowerShell scripts.

Explain the roles of Describe and It blocks in Pester testing.

Think of Describe as a chapter and It as a paragraph.

How do you write a simple test in Pester to check if a function returns the number 5?

Start with Describe, then It, then assertion.