add test for unique sram offsets for shops

doubles as a way to print them out for debugging

test/shops/TestSram.py

@@ -0,0 +1,13 @@
+from Shops import shop_table
+from test.TestBase import TestBase
+
+
+class TestSram(TestBase):
+    def testUniqueOffset(self):
+        sram_ids = set()
+        for shop_name, shopdata in shop_table.items():
+            for x in range(3):
+                new = shopdata.sram_offset + x
+                with self.subTest(shop_name, slot=x + 1, offset=new):
+                    self.assertNotIn(new, sram_ids)
+                sram_ids.add(new)