initial commit

tests/test_banking.py

@@ -0,0 +1,81 @@
+from unittest.mock import patch
+import pytest
+from banking import BankAccount
+
+
+@pytest.mark.parametrize("amount, expected", [
+    (1, 100_001),
+    (99_999, 199_999),
+    (100_000, 200_000),
+    (100_001, 200_001),
+])
+def test_deposit_bva(account, amount, expected):
+    assert account.deposit(amount) == expected
+
+
+def test_deposit_zero_raises(account):
+    with pytest.raises(ValueError, match="Deposit must be positive"):
+        account.deposit(0)
+
+
+def test_deposit_negative_raises(account):
+    with pytest.raises(ValueError, match="Deposit must be positive"):
+        account.deposit(-1)
+
+
+@pytest.mark.parametrize("amount, expected", [
+    (1, 99_999),
+    (99_999, 1),
+    (100_000, 0),
+])
+def test_withdraw_valid_boundaries(account, amount, expected):
+    assert account.withdraw(amount) == expected
+
+
+def test_withdraw_zero_raises(account):
+    with pytest.raises(ValueError, match="Withdrawal must be positive"):
+        account.withdraw(0)
+
+
+def test_withdraw_over_balance_raises(account):
+    with pytest.raises(ValueError, match="Insufficient funds"):
+        account.withdraw(100_001)
+    assert account.balance == 100_000
+
+
+def test_transfer_and_notification_mock(account):
+    recipient = BankAccount("Bob", 10_000)
+    with patch("banking.send_notification") as mocked:
+        assert account.transfer(recipient, 40_000) == 60_000
+        assert recipient.balance == 50_000
+        mocked.assert_called_once_with("Bob", "Received 40000 from Alice")
+
+
+def test_transfer_insufficient_funds_does_not_notify(account):
+    recipient = BankAccount("Bob")
+    with patch("banking.send_notification") as mocked:
+        with pytest.raises(ValueError, match="Insufficient funds"):
+            account.transfer(recipient, 100_001)
+        mocked.assert_not_called()
+        assert account.balance == 100_000
+        assert recipient.balance == 0
+
+
+def test_transfer_zero_raises(account):
+    with pytest.raises(ValueError, match="Transfer must be positive"):
+        account.transfer(BankAccount("Bob"), 0)
+
+
+def test_transfer_to_self_raises(account):
+    with pytest.raises(ValueError, match="Cannot transfer to the same account"):
+        account.transfer(account, 100)
+
+
+def test_blank_owner_raises():
+    with pytest.raises(ValueError, match="Owner is required"):
+        BankAccount("  ")
+
+
+def test_negative_initial_balance_raises():
+    with pytest.raises(ValueError, match="Initial balance cannot be negative"):
+        BankAccount("Alice", -1)