Mocking a function that is call by a method in a PowerShell class works on first run, but not on second run #797
Description
We have created a Pester test that tests a class-bases resource, that do work on the first run. The problem we are seeing is that the mocks only works on first run. On any subsequent run the mocks doesn't get hit, but instead the original function is called. This could be solved by running a new session for each run during development. But now we are starting to see problems in AppVeyor where we can't control that as easily.
We are hoping someone can shed a light on this problem.
Running Pester 4.0.3 on PS 5.1.16232.1000.
I have put together a minimal example scenario (repository) here; https://github.com/johlju/PesterTestClassBasedResource
1. Clone the repository
To run this example, do the following.
git clone https://github.com/johlju/PesterTestClassBasedResource
cd PesterTestClassBasedResource2. Run the Pester test
First run
Invoke-Pester .\MyDscResource.Tests.ps1Gives expected successful result.
Executing all tests in .\MyDscResource.Tests.ps1
Executing script .\MyDscResource.Tests.ps1
Describing MyDscResource\Get()
Context When the Get method is called
[+] Should not throw an error 1.13s
Tests completed in 1.13s
Tests Passed: 1, Failed: 0, Skipped: 0, Pending: 0, Inconclusive: 0
Second run
Invoke-Pester .\MyDscResource.Tests.ps1The test throws an error.
Executing all tests in .\MyDscResource.Tests.ps1
Executing script .\MyDscResource.Tests.ps1
Describing MyDscResource\Get()
Context When the Get method is called
[-] Should not throw an error 179ms
Expected: the expression not to throw an exception. Message was {Test-HelperFunction throw an error!}
from V:\Source\_Random\PesterTestClassBasedResource\HelperFunctions.psm1:6 char:5
+ throw 'Test-HelperFunction throw an error!'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
at <ScriptBlock>, V:\Source\_Random\PesterTestClassBasedResource\MyDscResource.Tests.ps1: line 17
17: { $databaseMembershipClass.Get() } | Should Not Throw