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There are still some inconsistencies such as, we are still using enzyme as out component wrappers and sinon for some stubbing. Here I used jest.fn() over sinon in some places that it seemed appropriate and replaced proxyquire with jest.mock. As I didn't want to complicate the PR too too much with the nuanced differences between jest.fn() and sinon that can be migrated in a different PR, as well as the migration from Enzyme to testing-library/react.