[Task] Add unit test cases for ToastsContext

[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 ToastsContext.

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

Additional Context:

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

[Goketech]

I created a pull request for this issue pr 235