Part: add color transparency unit tests

src/Mod/Part/CMakeLists.txt

@@ -69,6 +69,7 @@ set(Part_tests
     parttests/regression_tests.py
     parttests/TopoShapeListTest.py
     parttests/ColorPerFaceTest.py
+    parttests/ColorTransparencyTest.py
 )
 
 add_custom_target(PartScripts ALL SOURCES

src/Mod/Part/TestPartGui.py

@@ -44,6 +44,7 @@ def findDockWidget(name):
 #---------------------------------------------------------------------------
 """
 from parttests.ColorPerFaceTest import ColorPerFaceTest
+from parttests.ColorTransparencyTest import ColorTransparencyTest
 
 
 #class PartGuiTestCases(unittest.TestCase):

src/Mod/Part/parttests/ColorTransparencyTest.py

@@ -0,0 +1,58 @@
+import unittest
+
+import FreeCAD as App
+
+
+class ColorTransparencyTest(unittest.TestCase):
+
+    def setUp(self):
+        self._doc = App.newDocument()
+        self._pg = App.ParamGet('User parameter:BaseApp/Preferences/View')
+        self._backup_default_transparency = self._pg.GetInt('DefaultShapeTransparency')
+        self._backup_default_shapecolor = self._pg.GetUnsigned('DefaultShapeColor')
+
+
+    def tearDown(self):
+        App.closeDocument(self._doc.Name)
+        self._pg.SetInt('DefaultShapeTransparency', self._backup_default_transparency)
+        self._pg.SetUnsigned('DefaultShapeColor', self._backup_default_shapecolor)
+
+
+    def test_default_shape_transparency(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/11866
+        related: https://github.com/FreeCAD/FreeCAD/pull/11586
+        """
+        transparency = 70
+        self._pg.SetInt('DefaultShapeTransparency', transparency)
+        obj = self._doc.addObject('Part::Box')
+        assert obj.ViewObject.Transparency == transparency
+        obj.ViewObject.ShapeColor = (0.5, 0.0, 0.0)
+
+        self.assertEqual(obj.ViewObject.Transparency, transparency,
+            'transparency was unexpectedly changed to {} when changing the color.'.format(
+            obj.ViewObject.Transparency))
+
+
+    def test_default_shape_color(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/11866
+        """
+        self._pg.SetUnsigned('DefaultShapeColor', 0xff000000)  # red
+        obj = self._doc.addObject('Part::Box')
+
+        self.assertEqual(obj.ViewObject.ShapeColor, (1.0, 0.0, 0.0, 0.0),
+            'default shape color was not set correctly')
+
+
+    def test_app_plane_transparency(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/12064
+        """
+        self._pg.SetInt('DefaultShapeTransparency', 70)
+        obj = self._doc.addObject('App::Origin')
+        t = self._doc.findObjects('App::Plane')[0].ViewObject.Transparency
+
+        self.assertEqual(t, 0,
+            'transparency of App::Plane object is {} instead of 0'.format(t))
+