[Task] Add unit test cases for TransitionProcessor

[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 TransitionProcessor.

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

Additional Context:

• The TransitionProcessor can be found here
• An example for AudioService can be found here which may serve as a good source for reference

[anjumnnit]

@tjtanjin can you assign this to me?

[tjtanjin]

@tjtanjin can you assign this to me?

Go for it!

[anjumnnit]

Added unit test cases for transition Processor #193

please review my PR #193. Also can you please add hacktoberfest-accepted label?