Question

我在黄瓜Background部分放了一个调试print语句。

由于Background对每个场景执行一次，我希望每个场景看到Background的输出一次。但是输出只显示一次。为什么呢？

这是一个简单的例子，说明了我的问题：

计算器/特征/ adding.feature：

Feature: Adding

Background:
  Given calculator is ready

Scenario: Add two numbers
  Given the input "2" and "2"
  When the calculator is run
  Then the output should be "4"

Scenario: Add another two numbers
  Given the input "2" and "3"
  When the calculator is run
  Then the output should be "5"

计算器/特征/ step_definitions / calculator_steps.rb：

counter = 0

Given(/^calculator is ready$/) do
  puts "*** background ***"
  counter += 1
end

Given(/^the input "([^"]*)" and "([^"]*)"$/) do |x1, x2|
  @x1 = x1
  @x2 = x2
end

When(/^the calculator is run$/) do
  @output = `ruby calc.rb #{@x1} #{@x2}`
end

Then(/^the output should be "([^"]*)"$/) do |expected_output|
  expect(@output).to eq(expected_output)
  puts "counter=#{counter}"
end

计算器/ calc.rb：

x1 = ARGV[0].to_i
x2 = ARGV[1].to_i

print ("#{x1+x2}")

以下是执行方案时的输出：

$ cucumber
Feature: Adding

  Background:                 # features/adding.feature:3
    Given calculator is ready # features/step_definitions/calculator_steps.rb:3   
    *** background ***

  Scenario: Add two numbers       # features/adding.feature:6
    Given the input "2" and "2"   # features/step_definitions/calculator_steps.rb:8    
    When the calculator is run    # features/step_definitions/calculator_steps.rb:13
    Then the output should be "4" # features/step_definitions/calculator_steps.rb:17
      counter=1

  Scenario: Add another two numbers # features/adding.feature:11
    Given the input "2" and "3"     # features/step_definitions/calculator_steps.rb:8
    When the calculator is run      # features/step_definitions/calculator_steps.rb:13
    Then the output should be "5"   # features/step_definitions/calculator_steps.rb:17
      counter=2

2 scenarios (2 passed)
8 steps (8 passed)
0m0.094s

我希望看到行*** background ***两次（因为Background执行两次），但它只显示一次。为什么呢？

Answer 1

以黄瓜enable_if步骤打印的消息只打印一次，因为Cucumber在执行步骤时捕获标准输出并在Cucumber的控制下打印。以Background步骤打印的消息与步骤名称一起打印：仅在输出开头处打印一次。

每次Background运行时查看打印消息的方式都是相同的，因此，每次Background运行时都可以看到步骤名称。已经有一个问题和答案，但它不适用于当前版本的Cucumber（我有2.3.3），所以我写了一个新问题的答案显示how to print everything that Background prints before every scenario。

为什么黄瓜背景的输出只显示一次？

1 个答案: