add new test cases

core/tests/widgets/test_container_debug_mode.py

@@ -4,6 +4,18 @@
 import toga
 
 
+# test that a container-like widget in normal mode has a default background
+def test_box_no_background_in_normal_mode():
+    """A Box has no default background."""
+    # Disable layout debug mode
+    with MonkeyPatch.context() as mp:
+        mp.setenv("TOGA_DEBUG_LAYOUT", "0")
+        box = toga.Box()
+        # assert that the bg is default
+        assert hasattr(box.style, "background_color")
+        assert not box.style.background_color
+
+
 # test that a non-container-like widget in layout debug mode has a default background
 def test_button_debug_background():
     """A Button in layout debug mode has a default background."""
@@ -16,8 +28,21 @@ def test_button_debug_background():
         assert not button.style.background_color
 
 
+# test that a label in layout debug mode has a default background
+def test_label_no_debug_background():
+    """A Label in layout debug mode has a default background."""
+    # Enable layout debug mode
+    with MonkeyPatch.context() as mp:
+        mp.setenv("TOGA_DEBUG_LAYOUT", "1")
+        label = toga.Label("label")
+        # assert that the bg is default
+        assert hasattr(label.style, "background_color")
+        assert not label.style.background_color
+
+
 # test that a container-like widget in layout debug mode has a non-default background
-def test_box_debug_background():
+# that matches the expected debug_background_palette
+def test_box_debug_backgrounds():
     """A Box in layout debug mode has a non-default background."""
     # Enable layout debug mode
     with MonkeyPatch.context() as mp:
@@ -38,13 +63,14 @@ def test_box_debug_background():
             )
 
 
-# test that a container-like widget in normal mode has a default background
-def test_box_normal_background():
-    """A Box has no default background."""
+# test that a scroll container widget in layout debug mode doesn't have
+# a default background
+def test_scroll_container_debug_background():
+    """A container widget has a default background."""
     # Disable layout debug mode
     with MonkeyPatch.context() as mp:
-        mp.setenv("TOGA_DEBUG_LAYOUT", "0")
-        box = toga.Box()
-        # assert that the bg is default
-        assert hasattr(box.style, "background_color")
-        assert not box.style.background_color
+        mp.setenv("TOGA_DEBUG_LAYOUT", "1")
+        sc = toga.ScrollContainer()
+        # assert that the bg is not default
+        assert hasattr(sc.style, "background_color")
+        assert sc.style.background_color != color("white")