A turn based word game with full stack acceptance tests that run in milliseconds.
The default assembly runs everything in-memory. Even though the
APIs are async, the implementation is synchronous, so the system
is immediately consistent.
This makes it impossible to detect concurrency bugs that might occur in an asynchronous environment (such as the production assembly).
One way to address this is to run the scenarios in an asynchronous assembly that uses I/O. That would most likely trip the bugs. However, these tests are significantly slower.
Setting the below environment variable adds a delay (in milliseconds)
to every actor's call. Promises are not awaited, which allows
other tasks to execute in parallel, more similar to the production
assembly. None of the proxied methods have return values,
so it's OK to discard them. Errors are simply logged.
wordup_async_character=1 yarn test