Maybe you should make some comment in the instructions about using generators and the implications of overwriting the test files.
Looks like when folk use a generator/scaffold they are overwriting the supplied tests with boilerplate files.
This means they will no longer see the failing tests that the exercises are based on. They will see Rails errors but not be able to relate them to the code as well and the new (boilerplate) tests will all pass.
Great point. I’ll do that.