test_direct_api.py -> add tests/test-methods for str/repr of GroupBy

tests/test_direct_api.py

@@ -2853,6 +2853,21 @@ def test_manifold(self):
 class TestShapeList(DirectApiTestCase):
     """Test ShapeList functionality"""
 
+    def assertDunderStrEqual(self, actual: str, expected_lines: list[str]):
+        actual_lines = actual.splitlines()
+        self.assertEqual(len(actual_lines), len(expected_lines))
+        for actual_line, expected_line in zip(actual_lines, expected_lines):
+            start, end = re.split(r"at 0x[0-9a-f]+,", expected_line, 2, re.I)
+            self.assertTrue(actual_line.startswith(start))
+            self.assertTrue(actual_line.endswith(end))
+
+    def assertDunderReprEqual(self, actual: str, expected: str):
+        splitter = r"at 0x[0-9a-f]+"
+        actual_split_list = re.split(splitter, actual, 0, re.I)
+        expected_split_list = re.split(splitter, expected, 0, re.I)
+        for actual_split, expected_split in zip(actual_split_list, expected_split_list):
+            self.assertEqual(actual_split, expected_split)
+
     def test_sort_by(self):
         faces = Solid.make_box(1, 2, 3).faces() < SortBy.AREA
         self.assertAlmostEqual(faces[-1].area, 2, 5)
@@ -2965,9 +2980,34 @@ def test_group_by_retrieve_groups(self):
 
     def test_group_by_str_repr(self):
         nonagon = RegularPolygon(5,9)
-        # placeholder for future tests
-        self.assertTrue(True)
-
+
+        expected = [
+            "[[<build123d.topology.Edge at 0x1277f6e1cd0>],"
+            " [<build123d.topology.Edge at 0x1277f6e1c10>,"
+            "  <build123d.topology.Edge at 0x1277fd8a090>],"
+            " [<build123d.topology.Edge at 0x1277f75d690>,"
+            "  <build123d.topology.Edge at 0x127760d9310>],"
+            " [<build123d.topology.Edge at 0x12777261f90>,"
+            "  <build123d.topology.Edge at 0x1277f6bd2d0>],"
+            " [<build123d.topology.Edge at 0x1276fbb0590>,"
+            "  <build123d.topology.Edge at 0x1277fec6d90>]]"
+        ]
+
+        assertDunderStrEqual(nonagon.edges().group_by(Axis.X), expected)
+
+        expected_repr = (
+            "[[<build123d.topology.Edge object at 0x000001277FEC6D90>],"
+            " [<build123d.topology.Edge object at 0x000001277F6BCC10>,"
+            " <build123d.topology.Edge object at 0x000001277EC3D5D0>],"
+            " [<build123d.topology.Edge object at 0x000001277F6BEA90>,"
+            " <build123d.topology.Edge object at 0x000001276FCB2310>],"
+            " [<build123d.topology.Edge object at 0x000001277F6D10D0>,"
+            " <build123d.topology.Edge object at 0x000001276FBAAD10>],"
+            " [<build123d.topology.Edge object at 0x000001277FC86F90>,"
+            " <build123d.topology.Edge object at 0x000001277F6E1CD0>]]"
+        )
+        assertDunderReprEqual(repr(nonagon.edges().group_by(Axis.X)),expected_repr)
+
     def test_distance(self):
         with BuildPart() as box:
             Box(1, 2, 3)