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在下面的测试代码中,Generator类包含两个方法,每个方法都调用Counter类的next_count
方法。为什么从生成器中调用模拟对象无法正确测试?
对next_count
的这两个调用使用assert_called_with
进行了两次几乎相同的测试。生成器方法的测试失败。为什么?如何测试此通话?
代码在测试
generator.py
class Counter:
def __init__(self):
self.count = 1
def next_count(self):
self.count += 1
return self.count
class Generator:
def __init__(self):
self.counter = Counter()
def direct_call(self):
self.counter.next_count()
def iter_event(self):
while True:
yield self.counter.count
self.counter.next_count()
测试模块
test_generator.py
import unittest
import unittest.mock
import generator
class Generator(unittest.TestCase):
def setUp(self):
p = unittest.mock.patch('generator.Counter')
self.addCleanup(p.stop)
self.mock_counter = p.start()
def test_next_count_called_in_direct_call(self): # Passes
g = generator.Generator()
g.direct_call()
self.mock_counter.assert_called_with()
def test_next_count_called_in_iter_event(self): # Fails
g = generator.Generator()
count_gen = g.iter_event()
next(count_gen)
next(count_gen)
self.mock_counter.next_count.assert_called_with()