Add integration graphics tests for pcolormesh with 2d coords

lib/iris/tests/integration/plot/test_plot_2d_coords.py

@@ -0,0 +1,67 @@
+# (C) British Crown Copyright 2018, Met Office
+#
+# This file is part of Iris.
+#
+# Iris is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Iris is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with Iris.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Test plots with two dimensional coordinates.
+
+"""
+
+from __future__ import (absolute_import, division, print_function)
+from six.moves import (filter, input, map, range, zip)  # noqa
+
+# import iris tests first so that some things can be initialised before
+# importing anything else
+import iris.tests as tests
+
+import cartopy.crs as ccrs
+import matplotlib.pyplot as plt
+
+import iris
+
+# Run tests in no graphics mode if matplotlib is not available.
+if tests.MPL_AVAILABLE:
+    import iris.quickplot as qplt
+
+
+@tests.skip_data
+def simple_cube_w_2d_coords():
+    path = tests.get_data_path(('NetCDF', 'ORCA2', 'votemper.nc'))
+    cube = iris.load_cube(path)
+    return cube
+
+
+@tests.skip_plot
+@tests.skip_data
+class Test(tests.GraphicsTest):
+    def test_2d_coord_bounds_platecarree(self):
+        # To avoid a problem with Cartopy smearing the data where the
+        # longitude wraps, we set the central_longitude
+        cube = simple_cube_w_2d_coords()[0, 0]
+        ax = plt.axes(projection=ccrs.PlateCarree(central_longitude=180))
+        qplt.pcolormesh(cube)
+        ax.coastlines(color='red')
+        self.check_graphic()
+
+    def test_2d_coord_bounds_northpolarstereo(self):
+        cube = simple_cube_w_2d_coords()[0, 0]
+        ax = plt.axes(projection=ccrs.NorthPolarStereo())
+        qplt.pcolormesh(cube)
+        ax.coastlines(color='red')
+        self.check_graphic()
+
+
+if __name__ == "__main__":
+    tests.main()