Fix effectiveGasPrice computation for eth_getTransactionReceipt (#2610)

test/suites/dev/test-eth-rpc/test-eth-rpc-transaction-receipt.ts

@@ -0,0 +1,54 @@
+import { describeSuite, expect, beforeAll } from "@moonwall/cli";
+import { ApiPromise } from "@polkadot/api";
+import { BALTATHAR_ADDRESS, createViemTransaction, extractFee } from "@moonwall/util";
+
+describeSuite({
+  id: "D1206",
+  title: "Ethereum RPC - eth_getTransactionReceipt",
+  foundationMethods: "dev",
+  testCases: ({ it, context, log }) => {
+    let polkadotJs: ApiPromise;
+
+    beforeAll(() => {
+      polkadotJs = context.polkadotJs();
+    });
+
+    it({
+      id: "T01",
+      title:
+        "should have correct effectiveGasPrice when fee multiplier changes in consecutive blocks",
+      test: async function () {
+        const prevBlockNextFeeMultiplier = (
+          await polkadotJs.query.transactionPayment.nextFeeMultiplier()
+        ).toBigInt();
+
+        const { result } = await context.createBlock(
+          await createViemTransaction(context, {
+            gas: 21_000n,
+            maxFeePerGas: 1_000_000_000_000_000n,
+            maxPriorityFeePerGas: 1n,
+            type: "eip1559",
+            to: BALTATHAR_ADDRESS,
+          })
+        );
+        const txHash = result?.hash;
+        const txFee = extractFee(result?.events)!.amount.toBigInt();
+
+        const txReceipt = await context.viem().getTransactionReceipt({ hash: txHash });
+        const txReceiptFee = txReceipt.effectiveGasPrice * txReceipt.gasUsed;
+
+        const txBlockNextFeeMultiplier = (
+          await polkadotJs.query.transactionPayment.nextFeeMultiplier()
+        ).toBigInt();
+
+        // NOTE: fee multiplier needs to be different to ensure the test does not
+        // yield a false positive. If some conditions make these values equal, some
+        // extra transactions need to be added to the second block to make the
+        // values differ.
+        expect(prevBlockNextFeeMultiplier).not.toEqual(txBlockNextFeeMultiplier);
+
+        expect(txReceiptFee).toEqual(txFee);
+      },
+    });
+  },
+});