Add test for shared GeoAxes zoom propagation

Author: guillermodotn

lib/cartopy/tests/mpl/test_axes.py

@@ -154,3 +154,29 @@ def test_geoaxes_set_boundary_clipping():
                      transform=ax1.transAxes)
 
     return fig
+
+
+def test_shared_axes_zoom_propagation():
+    fig = plt.figure()
+    proj = ccrs.PlateCarree()
+    ax1 = fig.add_subplot(1, 2, 1, projection=proj)
+    ax2 = fig.add_subplot(1, 2, 2, projection=proj,
+                          sharex=ax1, sharey=ax1)
+
+    ax1.set_global()
+    ax2.set_global()
+    ax1.coastlines()
+    ax2.coastlines()
+
+    fig.draw_without_rendering()
+
+    ax1.set_xlim(-20, 20)
+    ax1.set_ylim(-10, 10)
+
+    assert ax2.get_xlim() == (-20, 20)
+    assert ax2.get_ylim() == (-10, 10)
+
+    fig.draw_without_rendering()
+
+    assert ax2.get_xlim() == (-20, 20)
+    assert ax2.get_ylim() == (-10, 10)

lib/cartopy/tests/mpl/test_set_extent.py

@@ -150,9 +150,10 @@ def test_view_lim_autoscaling():
 
 def test_view_lim_default_global(tmp_path):
     ax = plt.axes(projection=ccrs.PlateCarree())
-    # The view lim should be the default unit bbox until it is drawn.
+    # viewLim is set to projection bounds in __clear.
+    expected = np.array([[-180, -90], [180, 90]])
     assert_array_almost_equal(ax.viewLim.frozen().get_points(),
-                              [[0, 0], [1, 1]])
+                              expected)
     plt.savefig(tmp_path / 'view_lim_default_global.png')
     expected = np.array([[-180, -90], [180, 90]])
     assert_array_almost_equal(ax.viewLim.frozen().get_points(),