fix imports

Author: willschlitzer

pygmt/tests/test_grdgradient.py

@@ -3,13 +3,12 @@
 """
 import os
 
-import numpy.testing as npt
 import pytest
-from pygmt import grdgradient, grdinfo, load_dataarray
+import xarray as xr
+from pygmt import grdgradient, load_dataarray
 from pygmt.datasets import load_earth_relief
 from pygmt.exceptions import GMTInvalidInput
 from pygmt.helpers import GMTTempFile
-import xarray as xr
 
 
 @pytest.fixture(scope="module", name="grid")
@@ -99,6 +98,7 @@ def test_grdgradient_no_outgrid(grid, expected_grid):
     # check information of the output grid
     xr.testing.assert_allclose(a=result, b=expected_grid)
 
+
 def test_grdgradient_fails(grid):
     """
     Check that grdgradient fails correctly.