+aSession.startOperation()
+aDocument.removeFeature(aConstraint)
+aSession.finishOperation()
+assert (model.dof(aSketchFeature) == 8)
+aSession.startOperation()
+aStartPoint.setValue(-30., 0.)
+aSession.finishOperation()
+assert (angle(aSketchLineA, aSketchLineB) != NEW_ANGLE_DEGREE)
+assert (model.dof(aSketchFeature) == 8)