import unittest

class BankAccount:
    def __init__(self, initial_balance=0):
        self.balance = initial_balance
    
    def deposit(self, amount):
        if amount > 0:
            self.balance += amount
            return True
        return False
    
    def withdraw(self, amount):
        if 0 < amount <= self.balance:
            self.balance -= amount
            return True
        return False
    
    def get_balance(self):
        return self.balance

# Viết test cases ở đây
class TestBankAccount(unittest.TestCase):
    pass