Add unit tests for the functionality triggered by RabbitMQ events #371
Description
Recently, we implemented unit tests for checking that topics are created correctly for phases and works, see PR #369.
This required us to setup RabbitMQ service inside unit tests and also configure CircleCI.
Now, we can use the same approach for creating unit tests for other functionality which is triggered by RabbitMQ events. As before we didn't implement unit tests for some functionality, as we didn't have a good setup for that.
We don't have a concrete list of functionality to test yet, but we can think about it now.
For example, we may test that projects are reindexed correctly after some actions like joining members and removing members, as previously we had some issues with it, though it's fixed now.