Behave 背景

加入背景是为了有一组步骤。它接近于一个场景。我们可以用背景为多个场景添加一个背景。它在一个功能的每个场景之前运行，但在钩子之前的执行之后。

背景通常用于执行前提条件，如登录场景或数据库连接，等等。

可以添加一个背景描述，以提高人类的可读性。它只能在特征文件中出现一次，并且必须在场景或场景大纲之前声明。

背景不应该被用来创建一个复杂的状态（只有在无法避免的情况下）。这个部分应该是简短而真实的。另外，我们应该避免在一个特征文件中出现大量的场景。

带背景 的特征文件

题为 “Payment Process”的带背景的特征文件如下-

Feature − Payment Process
   Background:
      Given launch application
      Then Input credentials
   Scenario − Credit card transaction
      Given user is on credit card payment screen
      Then user should be able to complete credit card payment
   Scenario − Debit card transaction
      Given user is on debit card payment screen
      Then user should be able to complete debit card payment

相应的步骤实现文件

文件如下—

from behave import *
@given('launch application')
def launch_application(context):
   print('launch application')
@then('Input credentials')
def input_credentials(context):
   print('Input credentials')
@given('user is on credit card payment screen')
def credit_card_pay(context):
   print('User is on credit card payment screen')
@then('user should be able to complete credit card payment')
def credit_card_pay_comp(context):
   print('user should be able to complete credit card pay')
@given('user is on debit card payment screen')
def debit_card_pay(context):
   print('User is on debit card payment screen')
@then('user should be able to complete debit card payment')
def debit_card_pay_comp(context):
   print('user should be able to complete debit card payment')