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TDD @andrewsmedina Sunday, May 5, 2013

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tdd não é • teste depois de desenvolver • não deixa seu código a prova de erros Sunday, May 5, 2013

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tdd é • desenvolvimento dirigido a testes • teste antes do código • ajuda no foco • garante que o comportamento esperado está acontecendo (ou não) Sunday, May 5, 2013

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Sunday, May 5, 2013

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show me the code! Sunday, May 5, 2013

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import unittest class PrimosTest(unittest.TestCase): def test_menor_que_dois_nao_eh_primo(self): self.assertFalse(eh_primo(1)) Sunday, May 5, 2013

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E =================================================== =================== ERROR: test_menor_que_dois_nao_eh_primo (__main__.PrimosTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "teste_primos.py", line 6, in test_menor_que_dois_nao_eh_primo self.assertFalse(eh_primo(1)) NameError: global name 'eh_primo' is not defined ---------------------------------------------------------------------- Ran 1 test in 0.000s FAILED (errors=1) Sunday, May 5, 2013

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def eh_primo(numero): if numero < 2: return False Sunday, May 5, 2013

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. ---------------------------------------------------------------------- Ran 1 test in 0.000s OK Sunday, May 5, 2013

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import unittest from primos import eh_primo class PrimosTest(unittest.TestCase): def test_menor_que_dois_nao_eh_primo(self): self.assertFalse(eh_primo(1)) def test_primos(self): self.assertTrue(eh_primo(2)) self.assertTrue(eh_primo(7)) self.assertTrue(eh_primo(17)) Sunday, May 5, 2013

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.F =================================================== =================== FAIL: test_primos (__main__.PrimosTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "teste_primos.py", line 11, in test_primos self.assertTrue(eh_primo(2)) AssertionError: None is not true ---------------------------------------------------------------------- Ran 2 tests in 0.000s FAILED (failures=1) Sunday, May 5, 2013

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def eh_primo(numero): if numero < 2: return False qtd_divisiveis = 0 for n in range(2, numero+1): if numero % n == 0: qtd_divisiveis += 1 return qtd_divisiveis == 1 Sunday, May 5, 2013

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.. ---------------------------------------------------------------------- Ran 2 tests in 0.000s OK Sunday, May 5, 2013

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def eh_primo(numero): if numero < 2: return False for n in range(2, numero): if numero % n == 0: return False return True Sunday, May 5, 2013

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.. ---------------------------------------------------------------------- Ran 2 tests in 0.000s OK Sunday, May 5, 2013

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import unittest from primos import eh_primo class PrimosTest(unittest.TestCase): def test_menor_que_dois_nao_eh_primo(self): self.assertFalse(eh_primo(1)) def test_primos(self): self.assertTrue(eh_primo(2)) self.assertTrue(eh_primo(7)) self.assertTrue(eh_primo(17)) def test_nao_primos(self): self.assertFalse(eh_primo(20)) self.assertFalse(eh_primo(33)) self.assertFalse(eh_primo(45)) Sunday, May 5, 2013

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... ---------------------------------------------------------------------- Ran 3 tests in 0.000s OK Sunday, May 5, 2013

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obrigado! @andrewsmedina Sunday, May 5, 2013