28 lines
833 B
Python
28 lines
833 B
Python
import unittest
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from ledger import Ledger
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class LedgerTests(unittest.TestCase):
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def test_success_is_idempotent(self):
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ledger = Ledger()
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self.assertEqual(ledger.apply("deposit-1", "a", 10), 10)
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self.assertEqual(ledger.apply("deposit-1", "a", 10), 10)
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def test_overdraft_does_not_change_balance(self):
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ledger = Ledger()
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with self.assertRaises(ValueError):
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ledger.apply("withdraw-1", "a", -4)
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self.assertEqual(ledger.balance("a"), 0)
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def test_rejected_operation_can_be_retried(self):
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ledger = Ledger()
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with self.assertRaises(ValueError):
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ledger.apply("withdraw-1", "a", -4)
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ledger.apply("deposit-1", "a", 10)
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self.assertEqual(ledger.apply("withdraw-1", "a", -4), 6)
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if __name__ == "__main__":
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unittest.main()
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