Remove default test tolerances and sorting the travis package list.

.travis.yml

@@ -4,10 +4,10 @@ env:
     matrix:
         - NAME="Minimum dependencies."
           PYTHON_VERSION=3.7
-          PACKAGES="cython=0.28.5 numpy=1.16 matplotlib=2.2.3 proj4=5.2.0 scipy=1.2.0 owslib=0.17"
+          PACKAGES="cython=0.28.5 matplotlib=2.2.3 numpy=1.16 owslib=0.17 proj4=5.2.0 scipy=1.2.0"
         - NAME="Latest everything."
           PYTHON_VERSION=3.8
-          PACKAGES="cython numpy matplotlib-base pykdtree scipy fiona proj"
+          PACKAGES="cython fiona matplotlib-base numpy proj pykdtree scipy"
 
 
 sudo: false

lib/cartopy/tests/mpl/test_examples.py

@@ -29,7 +29,7 @@ def new_fn(*args, **kwargs):
 
 
 @pytest.mark.natural_earth
-@ExampleImageTesting(['global_map'], tolerance=0.5)
+@ExampleImageTesting(['global_map'])
 def test_global_map():
     import cartopy.examples.global_map as example
     example.main()
@@ -40,7 +40,6 @@ def test_global_map():
 else:
     contour_labels_tolerance = 0
 
-
 @pytest.mark.natural_earth
 @ExampleImageTesting(['contour_label'], tolerance=contour_labels_tolerance)
 def test_contour_label():

lib/cartopy/tests/mpl/test_images.py

@@ -192,7 +192,7 @@ def test_pil_Image():
 @pytest.mark.xfail((5, 0, 0) <= ccrs.PROJ4_VERSION < (5, 1, 0),
                    reason='Proj Orthographic projection is buggy.',
                    strict=True)
-@ImageTesting(['imshow_natural_earth_ortho'], tolerance=0.5)
+@ImageTesting(['imshow_natural_earth_ortho'])
 def test_background_img():
     ax = plt.axes(projection=ccrs.Orthographic())
     ax.background_img(name='ne_shaded', resolution='low')

lib/cartopy/tests/mpl/test_mpl_integration.py

@@ -98,7 +98,7 @@ def test_global_pcolor_wrap_no_transform():
 
 
 @pytest.mark.natural_earth
-@ImageTesting(['global_scatter_wrap'], tolerance=0.5)
+@ImageTesting(['global_scatter_wrap'])
 def test_global_scatter_wrap_new_transform():
     ax = plt.axes(projection=ccrs.PlateCarree())
     # By default the coastline feature will be drawn after patches.
@@ -111,7 +111,7 @@ def test_global_scatter_wrap_new_transform():
 
 
 @pytest.mark.natural_earth
-@ImageTesting(['global_scatter_wrap'], tolerance=0.5)
+@ImageTesting(['global_scatter_wrap'])
 def test_global_scatter_wrap_no_transform():
     ax = plt.axes(projection=ccrs.PlateCarree())
     ax.coastlines(zorder=0)
@@ -576,7 +576,7 @@ def test_quiver_regrid_with_extent():
 
 
 @pytest.mark.natural_earth
-@ImageTesting(['barbs_plate_carree'], tolerance=0.5)
+@ImageTesting(['barbs_plate_carree'])
 def test_barbs():
     x = np.arange(-60, 45, 5)
     y = np.arange(30, 75, 5)
@@ -598,7 +598,7 @@ def test_barbs():
 
 
 @pytest.mark.natural_earth
-@ImageTesting(['barbs_regrid'], tolerance=0.5)
+@ImageTesting(['barbs_regrid'])
 def test_barbs_regrid():
     x = np.arange(-60, 42.5, 2.5)
     y = np.arange(30, 72.5, 2.5)