Test/migrate to rtl

[matthijsgroen]

What

Replacing all tests using Enzyme with an React Testing Library equivalent. Enabling tests again where possible.

Why

Enzyme is considered Technical debt, blocking any React upgrades

Code Review

Please consider the following checklist when reviewing this Pull Request.
More background and details here.

• [ ] Does the code actually solve the problem it was meant to solve?
• [ ] Is the code covered by unit tests? Integration tests?
• [ ] Does anything here need documentation? (Focus on why, not what.)
• [ ] Does any of this code deal with privacy sensitive information or affects security? Ask an additional reviewer.
• [ ] Is the code easy to understand and change in the future?
• [ ] Is the same code or concept duplicated? Find a balance between DRYness and readability.
• [ ] Does the code reasonably adhere to the Kabisa coding standards?
• [ ] Be kind.

[codeclimate[bot]]

Code Climate has analyzed commit d6be692e and detected 179 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2
Style	177

The test coverage on the diff in this pull request is 96.7% (50% is the threshold).

This pull request will bring the total coverage in the repository to 70.2% (28.2% change).

View more on Code Climate.