运行带有示例的生菜场景时，创建的步骤未被识别

Question

让我给你说说我有多困惑。

如果我只是用一个包含变量的lettuce特性文件，一切都能正常工作。比如说，如果我创建以下这个特性文件：

Feature: File Finder
    I need to just look for the presence of certain files on a system

Scenario Outline:  Verify the presence (or absence) of a file on a system
    Given I log into a system at "172.16.100.23" as user "cadmin" with password "cadmin"
    Then I can look for "/var/log/nginx.log" and know that it should "not" be there

然后我用lettuce来运行它，它会告诉我需要创建以下步骤：

You can implement step definitions for undefined steps with these snippets:

# -*- coding: utf-8 -*-
from lettuce import step

@step(u'Given I log into a system at "([^"]*)" as user "([^"]*)" with password "([^"]*)"')
def given_i_log_into_a_system_at_group1_as_user_group2_with_password_group2(step, group1, group2, group3):
    assert False, 'This step must be implemented'
@step(u'Then I can look for "([^"]*)" and know that it should "([^"]*)" be there')
def then_i_can_look_for_group1_and_know_that_it_should_group2_be_there(step, group1, group2):
    assert False, 'This step must be implemented'

如果我把那个头部（"from lettuce import step"）和那些步骤粘贴到filefinder.py文件夹里，并把"assert False"改成"assert True"，只是为了让测试通过，我就能顺利通过测试：

Feature: File Finder
  I need to just look for the presence of certain files on a system

Scenario: Verify the presence (or absence) of a file on a system
  Given I log into a system at "172.16.100.23" as user "cadmin" with password "cadmin"
  Then I can look for "/var/log/nginx.log" and know that it should "not" be there

1 feature (1 passed)
1 scenario (1 passed)
2 steps (2 passed)

现在，我想在里面加一个示例表格。我只需把Then I can ask <manager> for <item>作为我的第三步，并添加以下示例表格：

Examples:
    | manager   | item            |
    | "bob"     | "raise"         |
    | "suzy"    | "more switches" |
    | "bill"    | "more coffee"   |

当我用lettuce运行这个时，它告诉我：

You can implement step definitions for undefined steps with these snippets:

# -*- coding: utf-8 -*-
from lettuce import step

@step(u'Then I can ask <manager> for <item>')
def then_i_can_ask_manager_for_item(step):
    assert False, 'This step must be implemented'

所以，我把这个加到我的filefinder.py文件里，并把"assert False"改成"assert True"，只是为了让它通过，看看控制台上显示的绿色。如果我用lettuce运行这个，它给我的回应和之前完全一样，似乎不识别占位符<manager>和<item>作为有效步骤。我想这就是我无法创建它要求的步骤的唯一情况——当我使用这里描述的占位符时：http://lettuce.it/tutorial/scenario-outlines.html。这个例子显示“场景大纲：阶乘 [0-4]”很奇怪，因为我不知道[0-4]是否必要。在我的测试中似乎没有任何影响，尽管我没有成功的示例测试，所以我可能完全错了。

我需要弄清楚为什么lettuce看不到那些带有"<placeholder>"语法的步骤。

有没有人能帮我解答一下这个问题？

测试框架变量占位符控制台输出 lettuce 场景大纲步骤定义示例表格

运行带有示例的生菜场景时，创建的步骤未被识别

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