Feat: Prepare an End-to-End Test to make sure changes works correctly

[logicalangel]

As you know, we must make many changes to our project, so we must ensure the app works correctly.
So, we must prepare e2e tests to check our project works correctly, and due to this, we need some test cases to consider. and at the end, we have a full check after each PR.

[logicalangel]

As Pouya said:

Here's the simplest use case:

1. Start in worker mode and track the Ethereum price
2. Start in broker mode and receive Ethereum price from worker