btrfs-progs: tests: add 019-non-skinny-false-alert

Catch a buggy condition fixed by "btrfs-progs: fsck: Fix a false alert
where extent record has wrong metadata flag"

Signed-off-by: David Sterba <dsterba@suse.com>

tests/fsck-tests/019-non-skinny-false-alert/test.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+#
+# $ btrfs check img
+# Checking filesystem on img
+# UUID: 17f2bf15-f4c2-4ebc-b1f7-39b7af26257a
+# checking extents
+# bad extent [29376512, 29392896), type mismatch with chunk
+# bad extent [29442048, 29458432), type mismatch with chunk
+# bad extent [29589504, 29605888), type mismatch with chunk
+# ...
+#
+# a buggy check leads to the above messages
+
+source $TOP/tests/common
+
+check_prereq btrfs
+
+image=$(extract_image "./default_case.img.xz")
+run_check_stdout $TOP/btrfs check "$image" 2>&1 |
+	grep -q "type mismatch with chunk" &&
+	_fail "unexpected error message in the output"
+
+rm -f "$image"