test: add database upgrade test from format version 1 to 2

Test the upgrade from probabilistic to boolean folder: terms, and
addition of path: terms.

The test depends on the pre-built test corpus and database tarball and
checksum file being in place. If it's not, the test is skipped. The
mechanism to fetch the test database will be added later.

At the time of writing, a working test database and checksum file is
available at

   http://notmuchmail.org/releases/test-databases/

It has been noted that some non-GNU environments make lack
sha256sum. We leave this portability issue for a followup patch.

diff --git a/test/T530-upgrade.sh b/test/T530-upgrade.sh
new file mode 100755 (executable)
index 0000000..2139618
--- /dev/null
+++ b/test/T530-upgrade.sh
@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+test_description="database upgrade"
+
+. ./test-lib.sh
+
+dbtarball=database-v1.tar.xz
+
+# XXX: Accomplish the same with test lib helpers
+if [ ! -e ${TEST_DIRECTORY}/test-databases/${dbtarball} ]; then
+    test_subtest_missing_external_prereq_["${dbtarball}"]=t
+fi
+
+test_expect_success \
+    'database checksum' \
+    '( cd $TEST_DIRECTORY/test-databases &&
+       sha256sum --quiet --check --status ${dbtarball}.sha256 )'
+
+tar xf $TEST_DIRECTORY/test-databases/${dbtarball} -C ${MAIL_DIR} --strip-components=1
+
+test_begin_subtest "folder: search does not work with old database version"
+output=$(notmuch search folder:foo)
+test_expect_equal "$output" ""
+
+test_begin_subtest "path: search does not work with old database version"
+output=$(notmuch search path:foo)
+test_expect_equal "$output" ""
+
+test_begin_subtest "database upgrade from format version 1"
+output=$(notmuch new)
+test_expect_equal "$output" "\
+Welcome to a new version of notmuch! Your database will now be upgraded.
+Your notmuch database has now been upgraded to database format version 2.
+No new mail."
+
+test_begin_subtest "folder: no longer matches in the middle of path"
+output=$(notmuch search folder:baz)
+test_expect_equal "$output" ""
+
+test_begin_subtest "folder: search"
+output=$(notmuch search --output=files folder:foo | notmuch_search_files_sanitize | sort)
+test_expect_equal "$output" "MAIL_DIR/foo/06:2,
+MAIL_DIR/foo/cur/07:2,
+MAIL_DIR/foo/cur/08:2,
+MAIL_DIR/foo/new/03:2,
+MAIL_DIR/foo/new/09:2,
+MAIL_DIR/foo/new/10:2,"
+
+test_begin_subtest "top level folder: search"
+output=$(notmuch search --output=files folder:'""' | notmuch_search_files_sanitize | sort)
+# bar/18:2, is a duplicate of cur/51:2,
+test_expect_equal "$output" "MAIL_DIR/01:2,
+MAIL_DIR/02:2,
+MAIL_DIR/bar/18:2,
+MAIL_DIR/cur/29:2,
+MAIL_DIR/cur/30:2,
+MAIL_DIR/cur/31:2,
+MAIL_DIR/cur/32:2,
+MAIL_DIR/cur/33:2,
+MAIL_DIR/cur/34:2,
+MAIL_DIR/cur/35:2,
+MAIL_DIR/cur/36:2,
+MAIL_DIR/cur/37:2,
+MAIL_DIR/cur/38:2,
+MAIL_DIR/cur/39:2,
+MAIL_DIR/cur/40:2,
+MAIL_DIR/cur/41:2,
+MAIL_DIR/cur/42:2,
+MAIL_DIR/cur/43:2,
+MAIL_DIR/cur/44:2,
+MAIL_DIR/cur/45:2,
+MAIL_DIR/cur/46:2,
+MAIL_DIR/cur/47:2,
+MAIL_DIR/cur/48:2,
+MAIL_DIR/cur/49:2,
+MAIL_DIR/cur/50:2,
+MAIL_DIR/cur/51:2,
+MAIL_DIR/cur/52:2,
+MAIL_DIR/cur/53:2,
+MAIL_DIR/new/04:2,"
+
+test_begin_subtest "path: search"
+output=$(notmuch search --output=files path:"bar" | notmuch_search_files_sanitize | sort)
+# cur/51:2, is a duplicate of bar/18:2,
+test_expect_equal "$output" "MAIL_DIR/bar/17:2,
+MAIL_DIR/bar/18:2,
+MAIL_DIR/cur/51:2,"
+
+test_begin_subtest "top level path: search"
+output=$(notmuch search --output=files path:'""' | notmuch_search_files_sanitize | sort)
+test_expect_equal "$output" "MAIL_DIR/01:2,
+MAIL_DIR/02:2,"
+
+test_begin_subtest "recursive path: search"
+output=$(notmuch search --output=files path:"bar/**" | notmuch_search_files_sanitize | sort)
+# cur/51:2, is a duplicate of bar/18:2,
+test_expect_equal "$output" "MAIL_DIR/bar/17:2,
+MAIL_DIR/bar/18:2,
+MAIL_DIR/bar/baz/05:2,
+MAIL_DIR/bar/baz/23:2,
+MAIL_DIR/bar/baz/24:2,
+MAIL_DIR/bar/baz/cur/25:2,
+MAIL_DIR/bar/baz/cur/26:2,
+MAIL_DIR/bar/baz/new/27:2,
+MAIL_DIR/bar/baz/new/28:2,
+MAIL_DIR/bar/cur/19:2,
+MAIL_DIR/bar/cur/20:2,
+MAIL_DIR/bar/new/21:2,
+MAIL_DIR/bar/new/22:2,
+MAIL_DIR/cur/51:2,"
+
+test_done