Layers: Fix visibility evalution + Unittesting

test_evaluation_visibility_a failed before, but it is now fixed
test_evaluation_visibility_b passed before and was used as control to make sure it was not broken

tests/python/render_layer/test_evaluation_visibility_b.py

@@ -0,0 +1,59 @@
+# ./blender.bin --background -noaudio --python tests/python/render_layer/test_link.py -- --testdir="/data/lib/tests/"
+
+# ############################################################
+# Importing - Same For All Render Layer Tests
+# ############################################################
+
+import unittest
+
+import os, sys
+sys.path.append(os.path.dirname(__file__))
+
+from render_layer_common import *
+
+
+# ############################################################
+# Testing
+# ############################################################
+
+class UnitTesting(RenderLayerTesting):
+    def test_visibility(self):
+        """
+        See if we can link objects
+        """
+        import bpy
+
+        scene = bpy.context.scene
+        cube = bpy.data.objects.new('guinea pig', bpy.data.meshes.new('mesh'))
+
+        layer = scene.render_layers.new('Visibility Test')
+        layer.collections.unlink(layer.collections[0])
+        scene.render_layers.active = layer
+
+        scene_collection_mom = scene.master_collection.collections.new("Visible")
+        scene_collection_kid = scene_collection_mom.collections.new("Invisible")
+
+        scene_collection_kid.objects.link(cube)
+
+        layer_collection_mom = layer.collections.link(scene_collection_mom)
+        layer_collection_kid = layer.collections.link(scene_collection_kid)
+
+        layer_collection_mom.hide = False
+        layer_collection_mom.collections[layer_collection_kid.name].hide = True
+        layer_collection_kid.hide = True
+
+        self.assertFalse(cube.visible_get(), "Object is not invisible")
+
+
+# ############################################################
+# Main - Same For All Render Layer Tests
+# ############################################################
+
+if __name__ == '__main__':
+    import sys
+
+    extra_arguments = sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else []
+    sys.argv = [__file__] + (sys.argv[sys.argv.index("--") + 2:] if "--" in sys.argv else [])
+
+    UnitTesting._extra_arguments = extra_arguments
+    unittest.main()