Fix unit tests where mocked req doesn't match new CustomRequest type

[cherylli]

Description

Fix this issue #120 (comment) from PR #120

I was looking at the wrong tests (e2e), it was the unit tests which had issues. Thanks @timDeHof

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature updates / changes
• Tests
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have updated the change log

[timDeHof]

Good job! the unit tests work locally on my computer.