1 files changed, 16 insertions, 0 deletions
diff --git a/tests/common b/tests/common
index 899ec7b1..2d337b0b 100644
--- a/tests/common
+++ b/tests/common
@@ -142,3 +142,19 @@ setup_root_helper()
 	fi
 	SUDO_HELPER=root_helper
 }
+
+prepare_test_dev()
+{
+	# num[K/M/G/T...]
+	local size="$1"
+
+	[[ "$TEST_DEV" ]] && return
+	[[ "$size" ]] || size='1G'
+
+	echo "\$TEST_DEV not given, use $TOP/test/test.img as fallback" >> \
+		$RESULTS
+	TEST_DEV="$TOP/tests/test.img"
+
+	truncate -s "$size" "$TEST_DEV" || _not_run "create file for loop device failed"
+}
+