Method from_parent

mypy/test/data.py:764–769

(
        cls, parent: DataSuiteCollector, *, name: str  # type: ignore[override]
    )

    @classmethod  # We have to fight with pytest here:
    def from_parent(
        cls, parent: DataSuiteCollector, *, name: str  # type: ignore[override]
    ) -> DataFileCollector:
        collector = super().from_parent(parent, name=name)
        assert isinstance(collector, DataFileCollector)
        return collector

    def collect(self) -> Iterator[DataDrivenTestCase]:
        yield from split_test_cases(