def test_stage_as_function(self):
'''Test the pipeline when only a simple function is added into the list
of stages.'''
pipeline = Pipeline()
pipeline.append(function_stage)
pipeline.append(Increment())
data = PipelineData()
data.items['num'] = 0
data = pipeline.run(data)
assert data.items['num'] == 2
def _test(self, num):
'''Insert ``num`` simple stages into the pipeline and run it.'''
pipeline = Pipeline()
assert pipeline.num_stages == 0
for n_stage in range(num):
increment_stage = Increment()
pipeline.append(increment_stage)
assert pipeline.num_stages == n_stage + 1
data = PipelineData()
data.items['num'] = 0
data = pipeline.run(data)
assert data.items['num'] == num
def test_return_type(self):
'''Test that a wrong return value is detected.'''
def no_return_value(data_in):
'''Does not return anything.'''
print(data_in)
def wrong_return_type(data_in):
'''Wrong return type for the pipeline.'''
return 'Wrong type'
pipeline = Pipeline()
pipeline.append(no_return_value)
with pytest.raises(TypeError):
pipeline.run(PipelineData())
pipeline = Pipeline()
pipeline.append(wrong_return_type)
with pytest.raises(TypeError):
pipeline.run(PipelineData())
