Method test_io_open_unbuffered_fromfile

numpy/core/tests/test_multiarray.py:5376–5381

(self, x, tmp_filename)

            assert_raises(OSError, np.fromfile, f, dtype=x.dtype)

    def test_io_open_unbuffered_fromfile(self, x, tmp_filename):
        # gh-6632
        x.tofile(tmp_filename)
        with io.open(tmp_filename, 'rb', buffering=0) as f:
            y = np.fromfile(f, dtype=x.dtype)
            assert_array_equal(y, x.flat)

    def test_largish_file(self, tmp_filename):
        # check the fallocate path on files > 16MB