+#!/usr/bin/env bash
+test_description='database upgrades'
+. $(dirname "$0")/test-lib.sh || exit 1
+
+test_require_external_prereq xapian-metadata
+
+XAPIAN_PATH=$MAIL_DIR/.notmuch/xapian
+BACKUP_PATH=$MAIL_DIR/.notmuch
+
+delete_feature () {
+ local key=$1
+ features=$(xapian-metadata get $XAPIAN_PATH features | grep -v "^$key")
+ xapian-metadata set $XAPIAN_PATH features "$features"
+}
+
+add_email_corpus
+
+for key in 'multiple paths per message' \
+ 'relative directory paths' \
+ 'exact folder:/path: search' \
+ 'mail documents for missing messages' \
+ 'modification tracking'; do
+ backup_database
+ test_begin_subtest "upgrade is triggered by missing '$key'"
+ delete_feature "$key"
+ output=$(notmuch new | grep Welcome)
+ test_expect_equal \
+ "$output" \
+ "Welcome to a new version of notmuch! Your database will now be upgraded."
+
+ restore_database
+
+ backup_database
+ test_begin_subtest "backup can be restored ['$key']"
+ notmuch dump > BEFORE
+ delete_feature "$key"
+ notmuch new
+ notmuch tag -inbox '*'
+ dump_file=$(echo ${BACKUP_PATH}/dump*)
+ notmuch restore --input=$dump_file
+ notmuch dump > AFTER
+ test_expect_equal_file BEFORE AFTER
+ restore_database
+done
+
+for key in 'from/subject/message-ID in database' \
+ 'indexed MIME types' \
+ 'index body and headers separately'; do
+ backup_database
+ test_begin_subtest "upgrade not triggered by missing '$key'"
+ delete_feature "$key"
+ output=$(notmuch new | grep Welcome)
+ test_expect_equal "$output" ""
+ restore_database
+done
+
+test_done