The mock server code in this folder is used for observing requests that will be sent to the server. When the server sends back a vague error it is often because the request it receives is incorrect so it is crucial to have a tool to view the request in order to know what client library code needs to change.

The steps to follow for using the mock server is:

1. Take a look at test/try-server.ts to see how the mock server is used.
2. In the system test you want to debug, change it to it.only to isolate that test.
3. In this test, surround the code with startServer(async () => {
4. Ensure apiEndpoint: 'localhost:50051' is passed into the datastore client that is used for this test.
5. If the system test hits an endpoint other than runQuery then in datastore-server.ts, change .addService(service, {runQuery: grpcEndpoint}) to .addService(service, {<<OtherGrpcEndpoint>>: grpcEndpoint})
6. Set a breakpoint on the line that says SET A BREAKPOINT HERE in datastore-server.ts
7. Debug with system tests (Enter npm run system-test -- --inspect in terminal)