Python Unit Testing

I have made a program which deposits and withdraws some amount into an account. Now I want to unit test this code. The problem is when i try to unit test the code it says: 0 tests in 0.00 secs. I don’t understand this. Here is my code for both the function file and the test file. Please tell me what I am doing wrong.

Function File

balance = 0

def deposit(amount):
    balance += amount
def withdraw(amount):
    balance -= amount

Test File

import unittest
from BankAccount import deposit, withdraw, balance

class BankATest(unittest.TestCase):
    def __init__(self):
    def depositTest(self):
        result = deposit(100)
        self.assertEqual(result, balance(100),None)

    def withdrawTest(self):
        result = withdraw(100)
        self.assertEqual(result, balance(0),None)

I want to check that when I deposit the money using the deposit function, the balance shows the deposited money. Likewise with the withdraw function. Any help or suggestion is appreciated.

OK, so since the last time I posted I have done a few modifications and now it is recognizing the two tests now it’s giving a different kind of error.

Function File

class BankA(object):
    def __init__(self,balance):
        self.balance = balance
    def deposit(self,amount):
        self.balance += amount
    def withdraw(self,amount):
        self.balance -= amount

Test File

import unittest
from BankAccount import  BankA

class BankATest(unittest.TestCase):
    def setUp(self):
        self.newBalance = BankA(0)
    def testDeposit(self):
        self.assertEqual(self.newBalance(100), 100)

    def testWithdraw(self):
        self.assertEqual(self.newBalance(-100), 0)

if __name__ == '__main__':

Error: line 21 in testWithdraw.
withdraw() missing one required positional argument: amount

According to UnitTest documentation .

tests are defined with methods whose names start with the letters test. This naming convention informs the test runner about which methods represent tests.

you have to rename test function …

depositTest to test_deposit or testDeposit

withdrawTest to test_withdraw