[pitivi] Changed alignment_editor test to use the transformation_expander instead of making a new instance of

[Alexandru Băluț <alexbalut src gnome org>]

commit 44b5a0f9c7c6e21f7d7cfd47b538979e0f18d581
Author: Jackson Eickhoff <jacksoneick gmail com>
Date:   Sun May 10 14:16:31 2020 -0500

    Changed alignment_editor test to use the transformation_expander instead of making a new instance of the 
class.

 tests/test_clipproperties.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/tests/test_clipproperties.py b/tests/test_clipproperties.py
index d51b0a81..0e2c3ef0 100644
--- a/tests/test_clipproperties.py
+++ b/tests/test_clipproperties.py
@@ -382,10 +382,10 @@ class ClipPropertiesTest(BaseTestUndoTimeline, BaseTestTimeline):
         clipproperties.new_project_loaded_cb(None, self.project)
         self.project.pipeline.get_position = mock.Mock(return_value=0)
 
-        transformation_box = TransformationProperties(self.app)
+        transformation_box = clipproperties.transformation_expander
         transformation_box._new_project_loaded_cb(self.app, self.project)
 
-        timeline = transformation_box.app.gui.editor.timeline_ui.timeline
+        timeline = timeline_container.timeline
         clip = self.add_clips_simple(timeline, 1)[0]
         timeline.selection.select([clip])
         source = transformation_box.source
@@ -402,7 +402,7 @@ class ClipPropertiesTest(BaseTestUndoTimeline, BaseTestTimeline):
         event.x = 0
         event.y = 0
         alignment_editor._motion_notify_event_cb(None, event)
-        alignment_editor._button_release_event_cb(alignment_editor, None)
+        alignment_editor._button_release_event_cb(None, None)
 
         self.assertEqual(source.get_child_property("posx").value, -width)
         self.assertEqual(source.get_child_property("posy").value, -height)