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+Tests for the idoreports_get_sla_ok_percent() function
+======================================================
+
+These are pg_tap tests. You need pg_tap installed for the PG version you want to test on, e.g. "postgresql-12-pgtap" for Debian/Ubuntu.
+
+I used these to find the cause for some seamingly strange NULL results.
+Which were basically due to a badly chosen ALIAS ("state_time" on line 20, which is now "state_time_").
+
+I run these tests on an Ubuntu/Debian system with "pg_virtualenv" like this:
+
+```
+pg_virtualenv -s pg_prove t/0*.sql
+```
+or simply
+```
+t/testme.sh
+```
+