MNT: xfail owslib tests and documentation that use NASA

This adds xfails to the NASA server requests that are failing
due to upstream issues that we can't control. This can be
reverted if/when NASA or owslib update their codebases.

docs/source/conf.py

@@ -93,6 +93,12 @@
 sphinx_gallery_conf = {
     'capture_repr': (),
     'examples_dirs': ['../../examples'],
+    # NASA wmts servers are returning bad content metadata
+    "expected_failing_examples": [
+        '../../examples/web_services/reprojected_wmts.py',
+        '../../examples/web_services/wmts.py',
+        '../../examples/web_services/wmts_time.py',
+    ],
     'filename_pattern': '^((?!sgskip).)*$',
     'gallery_dirs': ['gallery'],
     'within_subsection_order': ExampleTitleSortKey,

lib/cartopy/tests/io/test_ogc_clients.py

@@ -129,6 +129,7 @@ def test_float_resolution(self):
 @pytest.mark.filterwarnings("ignore:TileMatrixLimits")
 @pytest.mark.network
 @pytest.mark.skipif(not _OWSLIB_AVAILABLE, reason='OWSLib is unavailable.')
+@pytest.mark.xfail(reason='NASA servers are returning bad content metadata')
 class TestWMTSRasterSource:
     URI = 'https://map1c.vis.earthdata.nasa.gov/wmts-geo/wmts.cgi'
     layer_name = 'VIIRS_CityLights_2012'

lib/cartopy/tests/mpl/test_caching.py

@@ -150,6 +150,7 @@ 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.xfail(reason='NASA servers are returning bad content metadata')
 def test_wmts_tile_caching():
     image_cache = WMTSRasterSource._shared_image_cache
     image_cache.clear()

lib/cartopy/tests/mpl/test_web_services.py

@@ -15,6 +15,7 @@
 @pytest.mark.network
 @pytest.mark.skipif(not _OWSLIB_AVAILABLE, reason='OWSLib is unavailable.')
 @pytest.mark.mpl_image_compare(filename='wmts.png', tolerance=0.03)
+@pytest.mark.xfail(reason='NASA servers are returning bad content metadata')
 def test_wmts():
     ax = plt.axes(projection=ccrs.PlateCarree())
     url = 'https://map1c.vis.earthdata.nasa.gov/wmts-geo/wmts.cgi'