python - 在场景大纲之前运行某些步骤一次 - Python Behave

Question

如标题所示，我希望在场景大纲之前运行一些特定的配置/环境设置步骤。我知道有 Background 可以针对场景执行此操作，但 Behave 将场景大纲拆分为多个场景，从而为场景大纲中的每个输入运行后台。

这不是我想要的。由于某些原因，我无法提供我正在使用的代码，但我会编写一个示例功能文件。

Background: Power up module and connect
Given the module is powered up
And I have a valid USB connection

Scenario Outline: Example
    When I read the arduino
    Then I get some <'output'>

Example: Outputs
| 'output' |
| Hi       |
| No       |
| Yes      |

在这种情况下会发生的情况是 Behave 会重新启动并检查每个输出的 USB 连接 Hi、No、Yes，结果是三个电源循环和三个连接检查

我想要的是让 Behave 重新启动一次并检查一次连接，然后运行所有三个测试。

我该怎么做？

Answer 1

您最好的选择可能是使用 before_feature 环境 Hook ，并且 a)特征上的标签和/或 b) 直接特征名称。

例如:

一些.feature

@expensive_setup
Feature: some name
  description
  further description

  Background: some requirement of this test
    Given some setup condition that runs before each scenario
      And some other setup action

  Scenario: some scenario
      Given some condition
       When some action is taken
       Then some result is expected.

  Scenario: some other scenario
      Given some other condition
       When some action is taken
       Then some other result is expected.

steps/environment.py

def before_feature(context, feature):
    if 'expensive_setup' in feature.tags:
        context.execute_steps('''
            Given some setup condition that only runs once per feature
              And some other run once setup action
        ''')

替代步骤/environment.py

def before_feature(context, feature):
    if feature.name == 'some name':
        context.execute_steps('''
            Given some setup condition that only runs once per feature
              And some other run once setup action
        ''')