Add test sample on pgtap

plpgsql/pgtap/test_case_update_quality.sql

@@ -0,0 +1,18 @@
+BEGIN;
+-- Plan count should match the number of tests. If it does not then pg_prove will fail the test
+SELECT plan(1);
+
+-- Run the tests.
+-- Given
+TRUNCATE TABLE item;
+CALL new_item('foo', 0, 0);
+
+-- When
+CALL update_quality();
+
+-- Then
+SELECT is( name, 'fixme', 'name did change' ) FROM item;
+
+-- Finish the tests and clean up.
+SELECT * FROM finish();
+ROLLBACK;