[Task] Add unit test cases for pluginRoutes route

[tjtanjin]

Task Description:
Currently, we run unit tests using jest which can be found here.

However, the test cases are not yet comprehensive enough and work can be done to cover more grounds. Specifically for this issue, we hope to add test cases for the pluginRoutes route.

Deliverable(s):
New unit test cases that cover the testing of the pluginRoutes route.

Additional Context:

• The pluginRoutes route can be found here
• Existing unit test for routes can be found here which may serve as a good source for reference.

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