Method test_closing_fid

numpy/lib/tests/test_io.py:297–320

(self)

    @pytest.mark.slow_pypy
    def test_closing_fid(self):
        # Test that issue #1517 (too many opened files) remains closed
        # It might be a "weak" test since failed to get triggered on
        # e.g. Debian sid of 2012 Jul 05 but was reported to
        # trigger the failure on Ubuntu 10.04:
        # http://projects.scipy.org/numpy/ticket/1517#comment:2
        with temppath(suffix='.npz') as tmp:
            np.savez(tmp, data='LOVELY LOAD')
            # We need to check if the garbage collector can properly close
            # numpy npz file returned by np.load when their reference count
            # goes to zero.  Python 3 running in debug mode raises a
            # ResourceWarning when file closing is left to the garbage
            # collector, so we catch the warnings.
            with suppress_warnings() as sup:
                sup.filter(ResourceWarning)  # TODO: specify exact message
                for i in range(1, 1025):
                    try:
                        np.load(tmp)["data"]
                    except Exception as e:
                        msg = "Failed to load data from a file: %s" % e
                        raise AssertionError(msg)
                    finally:
                        if IS_PYPY:
                            gc.collect()

    def test_closing_zipfile_after_load(self):
        # Check that zipfile owns file and can close it.  This needs to