Remove hardcoding of localhost to use server assigned loopback and port

Author: zeuslawyer

src/localFunctionsTestnet.ts

@@ -39,20 +39,24 @@ export const startLocalFunctionsTestnet = async (
   options?: ServerOptions,
   port = 8545,
 ): Promise<LocalFunctionsTestnet> => {
+  let localhost
   const server = Ganache.server(options)
 
-  server.listen(port, 'localhost', (err: Error | null) => {
+  server.listen(port, (err: Error | null) => {
     if (err) {
       throw Error(`Error starting local Functions testnet server:\n${err}`)
     }
-    console.log(`Local Functions testnet server started on port ${port}`)
+    const loopbackAddress = server.address().address
+    const assignedPort = server.address().port
+    localhost = `http://${loopbackAddress}:${assignedPort}`
+    console.log(`Local Functions testnet server started at ${localhost}`)
   })
 
   const accounts = server.provider.getInitialAccounts()
   const firstAccount = Object.keys(accounts)[0]
   const admin = new Wallet(
     accounts[firstAccount].secretKey.slice(2),
-    new providers.JsonRpcProvider(`http://localhost:${port}`),
+    new providers.JsonRpcProvider(localhost),
   )
 
   const contracts = await deployFunctionsOracle(admin)