add test cases for complex conversions

units.sql

@@ -68,8 +68,15 @@ BEGIN
       ('Gallon (US)', 'fl. oz. (US)', '', 128),
       ('Gallon (US)', 'Pint (US)', '', 8),
       ('Gallon (US)', 'Quart (US)', '', 4), -- *
-      ('Gallon (US)', 'mL', '', 4*32*236.5882365/8)
-      
+      ('Gallon (US)', 'mL', '', 4*32*236.5882365/8),
+      ('Cup (metric)', 'kg', 'Whole Oats', 0.214/2), -- *
+      ('Cup (metric)', 'kg', 'Puffed Rice', .03), -- *
+      ('Cup (metric)', 'kg', 'Coconut Desiccated', .071*2), -- *
+      -- ('Cup (metric)', 'kg', 'Peanut butter', .24),
+      ('Cup (metric)', 'kg', 'Honey', .68), -- *
+      ('kg', 'mL', 'Honey', 250/.68),
+      ('Cup (metric)', 'kg', 'Brown Sugar', .055*4), -- *
+      ('g', 'mL', 'Brown Sugar', 250/.055/4/1000)
     ) AS tests(f,t,p,e) LOOP
     BEGIN
       SELECT convert_unit(item.f, item.t, item.p) INTO result;