chore: add util function to check emitted event with specific params

simulations/vip-205/simulations.ts

@@ -2,7 +2,7 @@ import { expect } from "chai";
 import { parseUnits } from "ethers/lib/utils";
 import { ethers } from "hardhat";
 
-import { expectEvents } from "../../src/utils";
+import { expectEventWithParams, expectEvents } from "../../src/utils";
 import { forking, testVip } from "../../src/vip-framework";
 import { checkInterestRate } from "../../src/vip-framework/checks/interestRateModel";
 import { vip205 } from "../../vips/vip-205";
@@ -89,6 +89,7 @@ forking(33570600, () => {
         ["NewSupplyCap", "NewBorrowCap", "NewMarketInterestRateModel", "NewInterestParams", "Failure"],
         [1, 1, 5, 1, 1], // Failure account for fail(Error.TOKEN_INSUFFICIENT_CASH, FailureInfo.REDUCE_RESERVES_CASH_NOT_AVAILABLE).
       );
+      await expectEventWithParams(txResponse, VBEP20_DELEGATOR_ABI, "Failure", ["14", "50", "0"]);
     },
   });
   describe("Post-VIP behaviour", async () => {

src/utils.ts

@@ -129,6 +129,35 @@ export const expectEvents = async (
   }
 };
 
+export const expectEventWithParams = async (
+  txResponse: TransactionResponse,
+  abi: ContractInterface,
+  expectedEvent: string,
+  expectedParams: any[], // Array of expected parameters
+) => {
+  const receipt = await txResponse.wait();
+  const iface = new ethers.utils.Interface(abi);
+
+  // Extract the events that match the expected event name
+  const matchingEvents = receipt.events
+    .map(event => {
+      try {
+        return iface.parseLog(event);
+      } catch (error) {
+        return null; // Ignore events that do not match the ABI
+      }
+    })
+    .filter(parsedEvent => parsedEvent && parsedEvent.name === expectedEvent);
+
+  // Check each event's parameters
+  matchingEvents.forEach((event, index) => {
+    expect(
+      event.args[index],
+      `Parameters of event ${expectedEvent} did not match at instance ${index + 1}`,
+    ).to.deep.equal(expectedParams[index]);
+  });
+};
+
 export const proposalSchema = {
   $schema: "http://json-schema.org/draft-07/schema#",
   type: "object",