Merge pull request #2214 from CosmWasm/unit-test-cost

Add unit test for cost function

Author: webmaster128

packages/vm/src/wasm_backend/engine.rs

@@ -100,6 +100,17 @@ fn limit_to_pages(limit: Size) -> Pages {
 mod tests {
     use super::*;
 
+    #[test]
+    fn cost_works() {
+        // accounting operator
+        assert_eq!(cost(&Operator::Br { relative_depth: 3 }), 1610);
+        assert_eq!(cost(&Operator::Return {}), 1610);
+
+        // anything else
+        assert_eq!(cost(&Operator::I64Const { value: 7 }), 115);
+        assert_eq!(cost(&Operator::I64Extend8S {}), 115);
+    }
+
     #[test]
     fn limit_to_pages_works() {
         // rounds down