`DiscoverRunner.run_tests` has a return type of `int`. While
`Runner.run_tests` has a wildly different `Tuple[bool, List[str]]`.
This refactors it so that we have the correct return type, by passing
the additional information about failed tests through a side effect to directly
write the failed tests to a file.
Note that we have to make `failed_tests_path` optional as otherwise the method
signature will not be compatible with the supertype.
Signed-off-by: Zixuan James Li <p359101898@gmail.com>
This directory contains scripts that are used in building, managing,
testing, and other forms of work in a Zulip development environment.
Note that tools that are also useful in production belong in
scripts/ or should be Django management commands.
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