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/younger.result
+++ b/tests_dir/younger.result
@@ -1,2 +1 @@
-id,age,chief,name
-1,20,0,carl
+{"content": [[1, 20, 0, "carl"]], "header": ["id", "age", "chief", "name"]}