Add zod devDep. Add validation for provider URL in tests

packages/web3.js-plugin-fee-estimation/package.json

@@ -33,7 +33,8 @@
     "typescript": "^5.1.6",
     "viem": "^1.3.1",
     "vite": "^4.4.6",
-    "vitest": "^0.33.0"
+    "vitest": "^0.33.0",
+    "zod": "^3.21.4"
   },
   "dependencies": {
     "@ethereumjs/rlp": "^4.0.1",

packages/web3.js-plugin-fee-estimation/src/plugin.spec.ts

 import { beforeAll, describe, expect, test } from 'vitest'
+import { z } from 'zod'
 import Web3, { Contract, FMT_BYTES, FMT_NUMBER } from 'web3'
 import {
   l2StandardBridgeABI,
@@ -9,7 +10,9 @@ import {
 
 import OptimismFeeEstimationPlugin from './plugin'
 
-const provider = process.env.VITE_L2_RPC_URL ?? 'https://mainnet.optimism.io'
+const defaultProvider = 'https://mainnet.optimism.io'
+const provider = z.string().url().default(defaultProvider).parse(process.env['VITE_L2_RPC_URL'])
+if (provider === defaultProvider) console.warn('Warning: Using default public provider, this could cause tests to fail due to rate limits. Set the VITE_L2_RPC_URL env to override default provider')
 
 describe('OptimismFeeEstimationPlugin', () => {
   let web3: Web3

pnpm-lock.yaml

@@ -568,6 +568,9 @@ importers:
       vitest:
         specifier: ^0.33.0
         version: 0.33.0(jsdom@22.1.0)
+      zod:
+        specifier: ^3.21.4
+        version: 3.21.4
 
 packages: