add assertion to FixtureLookupError.formatrepr #12962
Merged
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Broken out from #12930 where I originally was going to raise a
FixtureLookupError
but noticed thatformatrepr
crashed. I haven't researched thoroughly why it's currently making these assumptions, but it will crash if this assert doesn't hold - so thought I'd at least save some developer time in case anybody tries to useFixtureLookupError
again (e.g. when #12930 turns into an error)