add tests for collapsing 2 dimensions

lib/iris/tests/unit/coords/test_Coord.py

@@ -738,6 +738,15 @@ def test_string_nd_second(self):
 
         self.assertArrayEqual(collapsed_coord.points, expected)
 
+    def test_string_nd_both(self):
+        self.setupTestArrays((3, 4))
+        coord = AuxCoord(self.pts_real.astype(str))
+
+        collapsed_coord = coord.collapsed()
+        expected = ["0.0|10.0|20.0|30.0|40.0|50.0|60.0|70.0|80.0|90.0|100.0|110.0"]
+
+        self.assertArrayEqual(collapsed_coord.points, expected)
+
     def test_string_nd_bounds_first(self):
         self.setupTestArrays((3, 4))
         coord = AuxCoord(self.pts_real.astype(str), bounds=self.bds_real.astype(str))
@@ -784,6 +793,21 @@ def test_string_nd_bounds_second(self):
         self.assertArrayEqual(collapsed_coord.bounds[:, 0], expected_lower)
         self.assertArrayEqual(collapsed_coord.bounds[:, 1], expected_upper)
 
+    def test_string_nd_bounds_both(self):
+        self.setupTestArrays((3, 4))
+        coord = AuxCoord(self.pts_real.astype(str), bounds=self.bds_real.astype(str))
+
+        collapsed_coord = coord.collapsed()
+
+        # Points handling is as for non bounded case.  So just check bounds.
+        expected_lower = ["-2.0|8.0|18.0|28.0|38.0|48.0|58.0|68.0|78.0|88.0|98.0|108.0"]
+        expected_upper = [
+            "2.0|12.0|22.0|32.0|42.0|52.0|62.0|72.0|82.0|92.0|102.0|112.0"
+        ]
+
+        self.assertArrayEqual(collapsed_coord.bounds[:, 0], expected_lower)
+        self.assertArrayEqual(collapsed_coord.bounds[:, 1], expected_upper)
+
 
 class Test_is_compatible(tests.IrisTest):
     def setUp(self):