test: SignerListSet transaction integration tests (#1621)

* add tests

* clean up helper functions

* fix account funding

* remove unneeded method

* use new wallets for each test

* automatically fund wallets

* fix TODO

test/integration/setup.ts

@@ -1,7 +1,7 @@
-import { generateXAddress, Client } from 'xrpl-local'
+import { generateXAddress, Client, Wallet } from 'xrpl-local'
 
 import serverUrl from './serverUrl'
-import { ledgerAccept } from './utils'
+import { fundAccount, ledgerAccept } from './utils'
 
 export async function teardownClient(this: Mocha.Context): Promise<void> {
   this.client.disconnect()
@@ -29,8 +29,15 @@ export async function setupClient(
   this: Mocha.Context,
   server = serverUrl,
 ): Promise<void> {
+  this.wallet = Wallet.generate()
   return new Promise<void>((resolve, reject) => {
     this.client = new Client(server)
-    this.client.connect().then(resolve).catch(reject)
+    this.client
+      .connect()
+      .then(async () => {
+        await fundAccount(this.client, this.wallet)
+        resolve()
+      })
+      .catch(reject)
   })
 }