原始文件和test_module文件对同一情况给出不同的答案

问：

我对编码有点陌生，正在处理一个 replit 项目，但无法弄清楚为什么test_modules文件一直给出一个，即使代码在主文件上运行良好。AssertionError

原始文件budget_app.py（对于这个问题，只关注存款功能就足够了）：

class Category:

  def __init__(self, title):
    self.title = title

  ledger = []

  def deposit(self, amount=0, description=""):
    self.ledger.append({"amount": amount, "description": description})

  def withdraw(self, amount=0, description=""):
    if not self.check_funds(amount):
      return False
    amount = -1 * amount
    self.ledger.append({"amount": amount, "description": description})
    return True

  def get_balance(self):
    totalAmount = 0
    for i in self.ledger:
      totalAmount += i["amount"]
    return totalAmount

  def transfer(self, amount, cat):
    if not self.check_funds(amount):
      return False
    self.withdraw(amount, ("Transfer to " + cat.title))
    cat.deposit(amount, ("Transfer from " + self.title))
    return True

  def check_funds(self, amount):
    if amount > self.get_balance():
      return False
    return True

测试模块：

import unittest
import budget_app



class UnitTests(unittest.TestCase):
    maxDiff = None
    def setUp(self):
        self.food = budget_app.Category("Food")
        self.entertainment = budget_app.Category("Entertainment")
        self.business = budget_app.Category("Business")

    def test_deposit(self):
        self.food.deposit(900, "deposit")
        actual = self.food.ledger[0]
        expected = {"amount": 900, "description": "deposit"}
        self.assertEqual(actual, expected, 'Expected `deposit` method to create a specific object in the ledger instance variable.')

if __name__ == "__main__":
    unittest.main()

运行此test_module.py文件时遇到的错误是

======================================================================
FAIL: test_deposit (__main__.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\fnafb\OneDrive\Desktop\programming\python programs\test_modules.py", line 17, in test_deposit
    self.assertEqual(actual, expected, 'Expected `deposit` method to create a specific object in the ledger instance variable.')
AssertionError: {'amount': 10, 'description': 'deposit'} != {'amount': 900, 'description': 'deposit'}
- {'amount': 10, 'description': 'deposit'}
?            ^

+ {'amount': 900, 'description': 'deposit'}
?            ^^
 : Expected `deposit` method to create a specific object in the ledger instance variable.

======================================================================

它声称我的存款功能返回而不是{'amount': 10, 'description': 'deposit'}{'amount': 900, 'description': 'deposit'}

但是当我通过添加行直接在主文件中检查此问题时（我正在运行 budget.py 文件）

food = Category("Food")
food.deposit(900, "deposit")
actual = food.ledger[0]
print(actual)

输出是所需的输出{'amount': 900, 'description': 'deposit'}

对于多个类似的测试用例，我遇到了类似的错误。它们都在主文件中工作