test/tagging: add test for naked punctuation in tags; compare with quoting spaces.

This test also serves as documentation of the quoting
requirements. The comment lines are so that it exactly matches the man
page. Nothing more embarrassing than having an example in the man page
fail.

test/tagging

@@ -198,6 +198,31 @@ notmuch dump --format=batch-tag | sort > OUTPUT
 notmuch restore --format=batch-tag < BACKUP
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "--batch: only space and % needs to be encoded."
+notmuch dump --format=batch-tag > BACKUP
+
+notmuch tag --batch <<EOF
++winner *
++foo::bar%25 -- (One and Two) or (One and tag:winner)
++found::it -- tag:foo::bar%
+# ignore this line and the next
+
++space%20in%20tags -- Two
+# add tag '(tags)', among other stunts.
++crazy{ +(tags) +&are +#possible\ -- tag:"space in tags"
++match*crazy -- tag:crazy{
++some_tag -- id:"this is ""nauty)"""
+EOF
+
+cat <<EOF > EXPECTED
++%23possible%5c +%26are +%28tags%29 +crazy%7b +inbox +match%2acrazy +space%20in%20tags +tag4 +tag5 +unread +winner -- id:msg-002@notmuch-test-suite
++foo%3a%3abar%25 +found%3a%3ait +inbox +tag5 +unread +winner -- id:msg-001@notmuch-test-suite
+EOF
+
+notmuch dump --format=batch-tag | sort > OUTPUT
+notmuch restore --format=batch-tag < BACKUP
+test_expect_equal_file EXPECTED OUTPUT
+
 test_begin_subtest '--batch: unicode message-ids'
 
 ${TEST_DIRECTORY}/random-corpus --config-path=${NOTMUCH_CONFIG} \