diff --git a/testdata/images.txt b/testdata/images.txt
new file mode 100644
index 0000000..239d922
--- /dev/null
+++ b/testdata/images.txt
@@ -0,0 +1,4 @@
+# hauler image list
+# one image reference per line; blank lines and comments are ignored
+ghcr.io/hauler-dev/library/busybox
+ghcr.io/hauler-dev/library/busybox:stable