-echo
-echo === Add a backing file and format ===
-echo
-$QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device $TEST_IMG
-./qcow2.py $TEST_IMG dump-header
+ echo
+ echo ===== Testing with -o $IMGOPTS =====
+ echo
+ echo === Create image with unknown header extension ===
+ echo
+ _make_test_img 64M
+ ./qcow2.py "$TEST_IMG" add-header-ext 0x12345678 "This is a test header extension"
+ ./qcow2.py "$TEST_IMG" dump-header
+ _check_test_img
+
+ echo
+ echo === Rewrite header with no backing file ===
+ echo
+ $QEMU_IMG rebase -u -b "" "$TEST_IMG"
+ ./qcow2.py "$TEST_IMG" dump-header
+ _check_test_img
+
+ echo
+ echo === Add a backing file and format ===
+ echo
+ $QEMU_IMG rebase -u -b "/some/backing/file/path" -F host_device "$TEST_IMG"
+ ./qcow2.py "$TEST_IMG" dump-header
+done