DataTreeSnapshot dataTreeSnapshot = mock(DataTreeSnapshot.class);
DataTreeModification dataTreeModification = mock(DataTreeModification.class);
doReturn(dataTreeSnapshot).when(dataTree).takeSnapshot();
doReturn(dataTreeModification).when(dataTreeSnapshot).newModification();
DataTreeSnapshot dataTreeSnapshot = mock(DataTreeSnapshot.class);
DataTreeModification dataTreeModification = mock(DataTreeModification.class);
doReturn(dataTreeSnapshot).when(dataTree).takeSnapshot();
doReturn(dataTreeModification).when(dataTreeSnapshot).newModification();