Write a test for when a user tries to delete a non existing task (Backend)

Systers, an AnitaB.org community

Prerequisite:

Create a copy of the project into your account GitHub by forking systers/mentorship-backend project.
Clone the project onto your local development environment
[Optional] Create a branch to make your changes
Write one or more tests for the DELETE /mentorship_relation/{request_id}/task API, within the tests/tasks/test_api_delete_task.py file, to make sure the backend returns an error response when a user tries to deletes a non-existing task
Commit your change through the interface using our Commit message Style Guide.
Submit a Pull Request, targeting gci-dev branch, following the template provided in the description.

If you need help or get lost, post a response to our Participant Questions in our #gci stream.
Pull request template at this link.
Commit message Style Guide can be found here.
How to fork, clone and setup remotes the project into your account wiki page can be found here.
File you have to update can be found here

Submit a link to Pull Request (PR) created with the change

_daksha_, oliverfogelin, Anya Smirdina