+notmuch dump --format=batch-tag > BACKUP
+
+notmuch tag +"$tag1" +"$tag2" +"$tag3" -inbox -unread "*"
+
+test_begin_subtest 'format=batch-tag, round trip with strange tags'
+notmuch dump --format=batch-tag > EXPECTED.$test_count
+notmuch dump --format=batch-tag | notmuch restore --format=batch-tag
+notmuch dump --format=batch-tag > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'format=batch-tag, checking encoded output'
+notmuch dump --format=batch-tag -- from:cworth |\
+ awk "{ print \"+$enc1 +$enc2 +$enc3 -- \" \$5 }" > EXPECTED.$test_count
+notmuch dump --format=batch-tag -- from:cworth > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'restoring sane tags'
+notmuch restore --format=batch-tag < BACKUP
+notmuch dump --format=batch-tag > OUTPUT.$test_count
+test_expect_equal_file BACKUP OUTPUT.$test_count
+
+test_begin_subtest 'format=batch-tag, restore=auto'
+notmuch dump --format=batch-tag > EXPECTED.$test_count
+notmuch tag -inbox -unread "*"
+notmuch restore --format=auto < EXPECTED.$test_count
+notmuch dump --format=batch-tag > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'format=sup, restore=auto'
+notmuch dump --format=sup > EXPECTED.$test_count
+notmuch tag -inbox -unread "*"
+notmuch restore --format=auto < EXPECTED.$test_count
+notmuch dump --format=sup > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'format=batch-tag, restore=default'
+notmuch dump --format=batch-tag > EXPECTED.$test_count
+notmuch tag -inbox -unread "*"
+notmuch restore < EXPECTED.$test_count
+notmuch dump --format=batch-tag > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'format=sup, restore=default'
+notmuch dump --format=sup > EXPECTED.$test_count
+notmuch tag -inbox -unread "*"
+notmuch restore < EXPECTED.$test_count
+notmuch dump --format=sup > OUTPUT.$test_count
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count
+
+test_begin_subtest 'roundtripping random message-ids and tags'
+
+ ${TEST_DIRECTORY}/random-corpus --config-path=${NOTMUCH_CONFIG} \
+ --num-messages=100
+
+ notmuch dump --format=batch-tag| \
+ sort > EXPECTED.$test_count
+
+ notmuch tag +this_tag_is_very_unlikely_to_be_random '*'
+
+ notmuch restore --format=batch-tag < EXPECTED.$test_count
+
+ notmuch dump --format=batch-tag| \
+ sort > OUTPUT.$test_count
+
+test_expect_equal_file EXPECTED.$test_count OUTPUT.$test_count