Add unit tests mocha and sql

tests/sql/cron_run_jobs.sql

@@ -0,0 +1,20 @@
+---------------------------------------------------------------------------
+-- Listing
+--
+
+-- List current database
+select current_database();
+
+-- connect to the DB
+\c signalk
+
+-- output display format
+\x on
+
+-- Check the number of process pending
+-- Should be 22
+SELECT count(*) as jobs from public.process_queue pq where pq.processed is null;
+--set role scheduler
+SELECT public.run_cron_jobs();
+-- Check any pending job
+SELECT count(*) as any_pending_jobs from public.process_queue pq where pq.processed is null;