将行为或生菜与Python unittest集成
作者:互联网
我正在用Python查看BDD.结果验证很费劲,因为要验证的结果不会在失败时打印.
比较行为输出:
AssertionError:
File "C:\Python27\lib\site-packages\behave\model.py", line 1456, in run
match.run(runner.context)
File "C:\Python27\lib\site-packages\behave\model.py", line 1903, in run
self.func(context, *args, **kwargs)
File "steps\EcuProperties.py", line 28, in step_impl
assert vin == context.driver.find_element_by_xpath("//table[@id='infoTable']/tbody/tr[4]/td[2]").text
到SpecFlow NUnit输出:
Scenario: Verify VIN in Retrieve ECU properties -> Failed on thread #0
[ERROR] String lengths are both 16. Strings differ at index 15.
Expected: "ABCDEFGH12345679"
But was: "ABCDEFGH12345678"
--------------------------^
使用SpecFlow输出可以更快地找到故障原因.要获得错误的变量内容,必须将它们手动放入字符串中.
从Lettuce tutorial开始:
assert world.number == expected, \
"Got %d" % world.number
if text not in context.response:
fail('%r not in %r' % (text, context.response))
将此与Python unittest进行比较:
self.assertEqual('foo2'.upper(), 'FOO')
导致:
Failure
Expected :'FOO2'
Actual :'FOO'
<Click to see difference>
Traceback (most recent call last):
File "test.py", line 6, in test_upper
self.assertEqual('foo2'.upper(), 'FOO')
AssertionError: 'FOO2' != 'FOO'
但是,Python unittest中的方法不能在TestCase实例外部使用.
是否有一种很好的方法可以将Python单元测试的所有优点集成到Behave或Lettuce中?
解决方法:
nose包含一个程序包,该程序包接受unittest提供的所有基于类的断言并将其转换为简单函数,即模块的documentation states:
The nose.tools module provides […] all of the same
assertX
methods found inunittest.TestCase
(only spelled in 07002 fashion, soassert_equal
rather thanassertEqual
).
例如:
from nose.tools import assert_equal
@given("foo is 'blah'")
def step_impl(context):
assert_equal(context.foo, "blah")
您可以像使用unittest的.assertX方法一样,将自定义消息添加到断言中.
这就是我使用Behave运行的测试套件所使用的.
标签:python-behave,lettuce,python 来源: https://codeday.me/bug/20191119/2033215.html