fix: revert skipped test for test_plot_design_face_colors (#2266)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: RobPasMue

doc/changelog.d/2266.fixed.md

@@ -0,0 +1 @@
+Revert skipped test for test_plot_design_face_colors

tests/integration/test_plotter.py

@@ -968,8 +968,7 @@ def test_plot_design_multi_colors(modeler: Modeler, verify_image_cache):
 
 
 @skip_no_xserver
-@pytest.mark.skip(reason="Face colors requiring reset of image cache")
-def test_plot_design_face_colors(modeler: Modeler, verify_image_cache):
+def test_plot_design_face_colors(modeler: Modeler, tmp_path_factory: pytest.TempPathFactory):
     """Test plotting of design with/without multi_colors."""
     design = modeler.create_design("DesignFaceColors")
     # Create a sketch of a box
@@ -983,13 +982,24 @@ def test_plot_design_face_colors(modeler: Modeler, verify_image_cache):
     design.bodies[0].faces[1].set_color((0, 255, 0))
     design.bodies[0].faces[2].set_color((0, 0, 255))
 
+    # Define file name for screenshot
+    screenshot_path = (
+        tmp_path_factory.mktemp("test_plot_design_face_colors") / "plot_design_face_colors.png"
+    )
+
+    # Assert that the file does not exist before plotting
+    assert not screenshot_path.exists()
+
     # Design plotting
     design.bodies[0].plot(
-        screenshot=Path(IMAGE_RESULTS_DIR, "plot_design_face_colors.png"),
+        screenshot=screenshot_path,
         merge=False,
-        multi_colors=True,
+        multi_colors=True,  # Results are random and thus we cannot compare screenshots easily
     )
 
+    # Assert that the file exists after plotting
+    assert screenshot_path.exists()
+
 
 @skip_no_xserver
 def test_export_glb(modeler: Modeler):