Factor out the image classes to break circular dependency
This helps to break the circular dependency between common and
blockimgdiff.
Bug: 32379627
Test: unit tests pass
Change-Id: I90b5ff34782acbfac86f36265bd96c207d898bf6
diff --git a/tools/releasetools/test_common.py b/tools/releasetools/test_common.py
index 50fa86f..c0ebd89 100644
--- a/tools/releasetools/test_common.py
+++ b/tools/releasetools/test_common.py
@@ -25,9 +25,9 @@
import common
import test_utils
import validate_target_files
+from images import EmptyImage, DataImage
from rangelib import RangeSet
-from blockimgdiff import EmptyImage, DataImage
KiB = 1024
MiB = 1024 * KiB