Create unit tests for view directory

[pogi7]

Checklist before submitting a feature request

• [x] I have reviewed CONTRIBUTING.md document
• [x] I have done a quick search on the issue tracker to check if the feature request is not redundant

Is your feature request related to a problem? If yes, describe the problem

I am annoyed that there are no unit tests for the code in the view directory.

Describe the desired feature

I want there to be a unit test for every exported function or functional component in the view directory. This will allow for high code quality as these tests can be used to verify that the function or functional component behaves as expected while under test.

Additional context

There are currently no tests for the view directory. Possible frameworks to investigate are:

1. React Testing Library (the frontend is built on top of React)
2. VSCode Extension Tester (the frontend comes is wrapped inside of a VSCode extension)

[aematei]

We should probably test the view/src/components/Diagram/diagramUtils.ts test suite.