Refactoring of e2e.test.js file

[akvlad]

Current state

All the tests are placed to the same file. It causes several problems:

• the code is hard to read and support
• snapshot file is hard to support because all the snapshots in the same test case

Extra problem is that e2e test cases depend on each other which is not supported by Jest.

The latest test coverage review have shown that the tests amount should grow significantly.

Task

Need to provide a mechanism to start dependent test cases in order.
Need to split e2e.test.js file into a set of files containing less code.