feat: added unit tests for laboratory users lambda functions

[ignacionistal]

feat: added unit tests for laboratory users lambda functions

Type of Change*

• New feature
• Bug fix
• Documentation update
• Refactoring
• Hotfix
• Security patch
• UI/UX improvement

Description

Added unit test for lambda functions related to laboratory user.

Testing*

All new unit tests pass.

Impact

No impact, this only adds unit tests to existing code without modifying it.

Checklist*

• No new errors or warnings have been introduced.
• All tests pass successfully and new tests added as necessary.
• Documentation has been updated accordingly.
• Code adheres to the coding and style guidelines of the project.
• Code has been commented in particularly hard-to-understand areas.