code: def test_transfer():
      exchange = mock.Mock()
      price = Decimal(9750.19).quantize(Decimal(10) ** -2)
      exchange.quote_price = lambda pair: price
      exchange.name = "bitfinex"
  
      order = mock.Mock()
      order.path_id = "fake_id"
  
      exchange_pair = ExchangePair(exchange, USD / BTC)
  
      source = Wallet(exchange, 18903.89 * USD)
      source.lock(917.07 * USD, order, "test")
  
      target = Wallet(exchange, 3.79283997 * BTC)
  
      quantity = (256.19 * USD).lock_for("fake_id")
      commission = (2.99 * USD).lock_for("fake_id")
  
      Wallet.transfer(
          source,
          target,
          quantity,
          commission,
          exchange_pair,
          "transfer",
      )
  
      source = Wallet(exchange, 3.79283997 * BTC)
      source.lock(3.00000029 * BTC, order, "test")
  
      target = Wallet(exchange, 18903.89 * USD)
  
      quantity = (2.19935873 * BTC).lock_for("fake_id")
      commission = (0.00659732 * BTC).lock_for("fake_id")
  
      Wallet.transfer(
          source,
          target,
          quantity,
          commission,
          exchange_pair,
          "transfer",
      )
  
file_path: tensortrade/tests/tensortrade/unit/oms/wallets/test_wallet.py
imports: import pytest
  import unittest.mock
  from decimal import Decimal
  from tensortrade.core.exceptions import InsufficientFunds, IncompatibleInstrumentOperation
  from tensortrade.oms.exchanges import Exchange
  from tensortrade.oms.wallets import Wallet
  from tensortrade.oms.instruments import USD, BTC, Quantity, ExchangePair
label_desc: Use image node_id 9 for calling a global function with example usage: test_transfer() without return types