test: repalce endpoints from old testsolution

packages/integration-tests/src/helper.ts

@@ -1,7 +1,10 @@
 import { execSync } from "child_process";
+import { ethers } from "ethers";
 import { promises as fs } from "fs";
 import * as path from "path";
+import { Provider } from "zksync-web3";
 
+import { localConfig } from "./config";
 import { Logger } from "./entities";
 
 export class Helper {
@@ -35,4 +38,20 @@ export class Helper {
       console.log(`There is no the expected file: ${fileName}`);
     }
   }
+
+  async getBalanceETH(walletAddress: string, layer: string) {
+    let network: any;
+    let provider: any;
+    if (layer == "L1") {
+      network = localConfig.L1Network;
+      provider = ethers.getDefaultProvider(network);
+    } else if (layer == "L2") {
+      network = localConfig.L2Network;
+      provider = new Provider(network);
+    } else {
+      console.log(`Wrong layer: ${layer}`);
+    }
+    const balanceEth = ethers.utils.formatUnits(await provider.getBalance(walletAddress), "wei");
+    return balanceEth;
+  }
 }