This tutorial guides you through building a simple application with with RxJS in React. I am by no means an expert with RxJS, just learning it myself, but I just hope to offer you inspiration on how to do things differently in React. This tutorial is no introduction to RxJS but only one of many ways of using it with React.
The tutorial shows how you can build up on a mocked GraphQL server for writing tests for your Apollo Client queries and mutations in React. So far, the Apollo Client instance can be replaced with a mock, but the unsolved question keeps popping up: How to test Apollo Client in a React application?