def test_deepcopy_subset(adata, spmat: type):
    adata.obsp["arr"] = np.zeros((adata.n_obs, adata.n_obs))
    adata.obsp["spmat"] = spmat((adata.n_obs, adata.n_obs))

    adata = deepcopy(adata[:10].copy())

    assert isinstance(adata.obsp["arr"], np.ndarray)
    assert not isinstance(adata.obsp["arr"], ArrayView)
    np.testing.assert_array_equal(adata.obsp["arr"].shape, (10, 10))

    assert isinstance(adata.obsp["spmat"], spmat)
    assert not isinstance(
        adata.obsp["spmat"],
        SparseCSRView if spmat is sparse.csr_matrix else SparseCSCView,
    )
    np.testing.assert_array_equal(adata.obsp["spmat"].shape, (10, 10))
def reset_signal_handler(cls, signal_handler):
        """Class state:

        - Overwrites `cls._signal_handler`.
        OS state:
        - Overwrites signal handlers for SIGINT, SIGQUIT, and SIGTERM.

        NB: This method calls signal.signal(), which will crash if not called from the main thread!

        :returns: The :class:`SignalHandler` that was previously registered, or None if this is
                  the first time this method was called.
        """
        assert isinstance(signal_handler, SignalHandler)
        # NB: Modify process-global state!
        for signum, handler in signal_handler.signal_handler_mapping.items():
            signal.signal(signum, handler)
            # Retry any system calls interrupted by any of the signals we just installed handlers for
            # (instead of having them raise EINTR). siginterrupt(3) says this is the default behavior on
            # Linux and OSX.
            signal.siginterrupt(signum, False)

        previous_signal_handler = cls._signal_handler
        # NB: Mutate the class variables!
        cls._signal_handler = signal_handler
        return previous_signal_handler