code: def test_get_wallet(exchange, portfolio, wallet_xrp):
      assert wallet_xrp == portfolio.get_wallet(exchange.id, XRP)
  
imports: import pytest
  import unittest.mock
  from tensortrade.core.base import Clock
  from tensortrade.oms.wallets import Wallet, Portfolio
  from tensortrade.oms.instruments import USD, BTC, ETH, XRP, BCH
label_desc: Use image node_id 17 for calling a global function with example usage: test_get_wallet(exchange, portfolio, wallet_xrp) without return types