test: add rpc test for eth_getBalance (#521)

integration-tests/test/rpc.spec.ts

@@ -3,9 +3,12 @@ import { Wallet, BigNumber } from 'ethers'
 import chai, { expect } from 'chai'
 import { sleep, l2Provider, GWEI } from './shared/utils'
 import chaiAsPromised from 'chai-as-promised'
+import { OptimismEnv } from './shared/env'
 chai.use(chaiAsPromised)
 
 describe('Basic RPC tests', () => {
+  let env: OptimismEnv;
+
   const DEFAULT_TRANSACTION = {
     to: '0x' + '1234'.repeat(10),
     gasLimit: 4000000,
@@ -17,6 +20,10 @@ describe('Basic RPC tests', () => {
   const provider = injectL2Context(l2Provider)
   const wallet = Wallet.createRandom().connect(provider)
 
+  before(async () => {
+    env = await OptimismEnv.new()
+  })
+
   describe('eth_sendRawTransaction', () => {
     it('should correctly process a valid transaction', async () => {
       const tx = DEFAULT_TRANSACTION
@@ -119,6 +126,14 @@ describe('Basic RPC tests', () => {
     })
   })
 
+  describe('eth_getBalance', () => {
+    it('should get the OVM_ETH balance', async () => {
+      const rpcBalance = await provider.getBalance(env.l2Wallet.address)
+      const contractBalance = await env.ovmEth.balanceOf(env.l2Wallet.address)
+      expect(rpcBalance).to.be.deep.eq(contractBalance)
+    })
+  })
+
   describe('eth_chainId', () => {
     it('should get the correct chainid', async () => {
       const { chainId } = await provider.getNetwork()