btrfs-progs: tests: add 021-partially-dropped-snapshot-case

Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/fsck-tests/021-partially-dropped-snapshot-case/test.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# confirm whether btrfsck supports to check a partially dropped snapshot
+
+source $TOP/tests/common
+
+check_prereq btrfs
+
+for img in *.img
+do
+	image=$(extract_image $img)
+	run_check_stdout $TOP/btrfs check "$image" 2>&1 |
+		grep -q "Errors found in extent allocation tree or chunk allocation"
+	if [ $? -eq 0 ]; then
+		rm -f "$image"
+		_fail "unexpected error occurred when checking $img"
+	fi
+	rm -f "$image"
+done