TST: Skip tests where either scipy or pykdtree are required

If a user doesn't have scipy or pykdtree installed on their system
they can not import image transform modules, so we also need to
skip these tests for them.

lib/cartopy/tests/conftest.py

@@ -3,6 +3,29 @@
 # This file is part of Cartopy and is released under the LGPL license.
 # See COPYING and COPYING.LESSER in the root of the repository for full
 # licensing details.
+import pytest
+
+
+_HAS_PYKDTREE = True
+_HAS_SCIPY = True
+
+try:
+    import pykdtree  # noqa: F401
+except ImportError:
+    _HAS_PYKDTREE = False
+
+try:
+    import scipy  # noqa: F401
+except ImportError:
+    _HAS_SCIPY = False
+
+requires_scipy = pytest.mark.skipif(
+    not _HAS_SCIPY,
+    reason="scipy is required")
+requires_pykdtree = pytest.mark.skipif(
+    not _HAS_PYKDTREE,
+    reason="pykdtree is required")
+_HAS_PYKDTREE_OR_SCIPY = _HAS_PYKDTREE or _HAS_SCIPY
 
 
 def pytest_configure(config):

lib/cartopy/tests/io/test_ogc_clients.py

@@ -21,6 +21,13 @@
 import pytest
 
 import cartopy.crs as ccrs
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip('pykdtree or scipy is required', allow_module_level=True)
+
+
 import cartopy.io.ogc_clients as ogc
 from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE
 

lib/cartopy/tests/mpl/test_caching.py

@@ -17,7 +17,12 @@
 import pytest
 
 import cartopy.crs as ccrs
-from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE, WMTSRasterSource
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if _HAS_PYKDTREE_OR_SCIPY:
+    from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE, WMTSRasterSource
+
 import cartopy.io.shapereader
 from cartopy.mpl import _MPL_38
 from cartopy.mpl.feature_artist import FeatureArtist
@@ -149,7 +154,8 @@ def test_contourf_transform_path_counting():
 
 @pytest.mark.filterwarnings("ignore:TileMatrixLimits")
 @pytest.mark.network
-@pytest.mark.skipif(not _OWSLIB_AVAILABLE, reason='OWSLib is unavailable.')
+@pytest.mark.skipif(not _HAS_PYKDTREE_OR_SCIPY or not _OWSLIB_AVAILABLE,
+                    reason='OWSLib and at least one of pykdtree or scipy is required')
 def test_wmts_tile_caching():
     image_cache = WMTSRasterSource._shared_image_cache
     image_cache.clear()

lib/cartopy/tests/mpl/test_contour.py

@@ -8,10 +8,9 @@
 import numpy as np
 from numpy.testing import assert_array_almost_equal
 import pytest
-from scipy.interpolate import NearestNDInterpolator
-from scipy.signal import convolve2d
 
 import cartopy.crs as ccrs
+from cartopy.tests.conftest import requires_scipy
 
 
 def test_contour_plot_bounds():
@@ -72,8 +71,12 @@ def test_plot_after_contour_doesnt_shrink(func):
     assert_array_almost_equal(ax.get_extent(), expected)
 
 
+@requires_scipy
 def test_contour_linear_ring():
     """Test contourf with a section that only has 3 points."""
+    from scipy.interpolate import NearestNDInterpolator
+    from scipy.signal import convolve2d
+
     ax = plt.axes([0.01, 0.05, 0.898, 0.85], projection=ccrs.Mercator(),
                   aspect='equal')
     ax.set_extent([-99.6, -89.0, 39.8, 45.5])

lib/cartopy/tests/mpl/test_examples.py

@@ -9,6 +9,11 @@
 
 import cartopy.crs as ccrs
 from cartopy.mpl import _MPL_38
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip('pykdtree or scipy is required', allow_module_level=True)
 
 
 @pytest.mark.natural_earth

lib/cartopy/tests/mpl/test_features.py

@@ -10,7 +10,11 @@
 
 import cartopy.crs as ccrs
 import cartopy.feature as cfeature
-from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if _HAS_PYKDTREE_OR_SCIPY:
+    from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE
 
 
 @pytest.mark.filterwarnings("ignore:Downloading")
@@ -43,6 +47,7 @@ def test_natural_earth_custom():
     return ax.figure
 
 
+@pytest.mark.skipif(not _HAS_PYKDTREE_OR_SCIPY, reason='pykdtree or scipy is required')
 @pytest.mark.mpl_image_compare(filename='gshhs_coastlines.png', tolerance=0.95)
 def test_gshhs():
     ax = plt.axes(projection=ccrs.Mollweide())
@@ -58,7 +63,8 @@ def test_gshhs():
 
 
 @pytest.mark.network
-@pytest.mark.skipif(not _OWSLIB_AVAILABLE, reason='OWSLib is unavailable.')
+@pytest.mark.skipif(not _HAS_PYKDTREE_OR_SCIPY or not _OWSLIB_AVAILABLE,
+                    reason='OWSLib and at least one of pykdtree or scipy is required')
 @pytest.mark.xfail(raises=ParseError,
                    reason="Bad XML returned from the URL")
 @pytest.mark.mpl_image_compare(filename='wfs.png')
@@ -73,7 +79,8 @@ def test_wfs():
 
 
 @pytest.mark.network
-@pytest.mark.skipif(not _OWSLIB_AVAILABLE, reason='OWSLib is unavailable.')
+@pytest.mark.skipif(not _HAS_PYKDTREE_OR_SCIPY or not _OWSLIB_AVAILABLE,
+                    reason='OWSLib and at least one of pykdtree or scipy is required')
 @pytest.mark.xfail(raises=ParseError,
                    reason="Bad XML returned from the URL")
 @pytest.mark.mpl_image_compare(filename='wfs_france.png')

lib/cartopy/tests/mpl/test_images.py

@@ -16,9 +16,14 @@
 from cartopy import config
 import cartopy.crs as ccrs
 import cartopy.io.img_tiles as cimgt
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
 import cartopy.tests.test_img_tiles as ctest_tiles
 
 
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip('pykdtree or scipy is required', allow_module_level=True)
+
+
 NATURAL_EARTH_IMG = (config["repo_data_dir"] / 'raster' / 'natural_earth'
                      / '50-natural-earth-1-downsampled.png')
 REGIONAL_IMG = (config['repo_data_dir'] / 'raster' / 'sample'

lib/cartopy/tests/mpl/test_img_transform.py

@@ -14,6 +14,12 @@
 
 from cartopy import config
 import cartopy.crs as ccrs
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip('pykdtree or scipy is required', allow_module_level=True)
+
 import cartopy.img_transform as im_trans
 
 

lib/cartopy/tests/mpl/test_mpl_integration.py

@@ -13,6 +13,7 @@
 
 import cartopy.crs as ccrs
 from cartopy.mpl import _MPL_38
+from cartopy.tests.conftest import requires_scipy
 
 
 @pytest.mark.natural_earth
@@ -817,6 +818,7 @@ def test_quiver_rotated_pole():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='quiver_regrid.png')
 def test_quiver_regrid():
@@ -836,6 +838,7 @@ def test_quiver_regrid():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='quiver_regrid_with_extent.png',
                                tolerance=0.54)
@@ -857,6 +860,7 @@ def test_quiver_regrid_with_extent():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='barbs_plate_carree.png')
 def test_barbs():
@@ -880,6 +884,7 @@ def test_barbs():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='barbs_regrid.png')
 def test_barbs_regrid():
@@ -899,6 +904,7 @@ def test_barbs_regrid():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='barbs_regrid_with_extent.png',
                                tolerance=0.54)
@@ -955,6 +961,7 @@ def test_barbs_1d_transformed():
     return fig
 
 
+@requires_scipy
 @pytest.mark.natural_earth
 @pytest.mark.mpl_image_compare(filename='streamplot.png', style='mpl20')
 def test_streamplot():

lib/cartopy/tests/mpl/test_web_services.py

@@ -7,6 +7,13 @@
 import matplotlib.pyplot as plt
 import pytest
 
+from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
+
+
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip('pykdtree or scipy is required', allow_module_level=True)
+
+
 import cartopy.crs as ccrs
 from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE
 

lib/cartopy/tests/test_img_transform.py

@@ -7,8 +7,16 @@
 import numpy as np
 from numpy.testing import assert_array_equal
 import pytest
-import scipy.spatial
 
+from cartopy.tests.conftest import (
+    _HAS_PYKDTREE_OR_SCIPY,
+    requires_pykdtree,
+    requires_scipy,
+)
+
+
+if not _HAS_PYKDTREE_OR_SCIPY:
+    pytest.skip("pykdtree or scipy are required", allow_module_level=True)
 import cartopy.crs as ccrs
 import cartopy.img_transform as img_trans
 
@@ -113,7 +121,8 @@ def test_gridding_data_outside_projection():
 
 @pytest.mark.parametrize("target_prj",
                          (ccrs.Mollweide(), ccrs.Orthographic()))
-@pytest.mark.parametrize("use_scipy", (True, False))
+@pytest.mark.parametrize("use_scipy", (pytest.param(True, marks=requires_scipy),
+                                       pytest.param(False, marks=requires_pykdtree)))
 def test_regridding_with_invalid_extent(target_prj, use_scipy, monkeypatch):
     # tests that when a valid extent results in invalid points in the
     # transformed coordinates, the regridding does not error.
@@ -128,6 +137,7 @@ def test_regridding_with_invalid_extent(target_prj, use_scipy, monkeypatch):
 
     if use_scipy:
         monkeypatch.setattr(img_trans, "_is_pykdtree", False)
+        import scipy.spatial
         monkeypatch.setattr(img_trans, "_kdtreeClass", scipy.spatial.cKDTree)
     _ = img_trans.regrid(data, lons, lats, data_trans, target_prj,
                          target_x, target_y)

lib/cartopy/tests/test_vector_transform.py

@@ -6,6 +6,14 @@
 
 import numpy as np
 from numpy.testing import assert_array_almost_equal, assert_array_equal
+import pytest
+
+
+try:
+    import scipy  # noqa: F401
+except ImportError:
+    pytest.skip("scipy is required for vector transforms", allow_module_level=True)
+
 
 import cartopy.crs as ccrs
 import cartopy.vector_transform as vec_trans