+test_begin_subtest 'reindex preserves tags with special prefixes'
+notmuch tag +attachment2 +encrypted2 +signed2 '*'
+notmuch dump > EXPECTED
+notmuch reindex '*'
+notmuch dump > OUTPUT
+notmuch tag -attachment2 -encrypted2 -signed2 '*'
+test_expect_equal_file EXPECTED OUTPUT
+