Keep tests in json format

So the results are typed
2020-08-24 18:37:55 +02:00
parent d592cc3050
commit 4d280e02b0
55 changed files with 55 additions and 329 deletions
--- a/tests_dir/select_people_join_rooms.query
+++ b/tests_dir/select_people_join_rooms.query
@@ -1 +1 @@
-σid=='---' (people⧓person_room ⧓ rooms)
+σ id is None (people⧓person_room ⧓ rooms)