Test Coverage for Studio Repository

[picksitquick]

Describe the bug
You need cover the test method for Studio Repository class, create a test class and make separate test methods for each repository method.
Methods you need to work on:

• findByRegistration
• findByVisibility

Creating a New Branch
Make sure to create a new branch, use the naming convention: "test/your_git_username"

Reference
You can view the test classes created in User Repository to get reference/setup.

Expected behavior
Make sure the test methods are working and covering the methods within Studio Repository, you can do this by running the test with coverage option provided in intellij IDE.

Raise a PR
Once the task is completed, make sure to raise a PR so that we can view your changes.

Due Date
23rd Aug 2023