Question

根据页面，以下两个代码提供相同的测试。但我无法理解为什么它没有参数page_title。 Rspec中的"foo"字符串是否有特殊含义？

spec/support/utilities.rb

def full_title(page_title)
  base_title = "Ruby on Rails Tutorial Sample App"
  if page_title.empty?
    base_title
  else
    "#{base_title} | #{page_title}"
  end
end

spec/helpers/application_helper_spec.rb

require 'spec_helper'

describe ApplicationHelper do

  describe "full_title" do
    it "should include the page title" do
      expect(full_title("foo")).to match(/foo/)
    end

    it "should include the base title" do
      expect(full_title("foo")).to match(/^Ruby on Rails Tutorial Sample App/)
    end

    it "should not include a bar for the home page" do
      expect(full_title("")).not_to match(/\|/)
    end
  end
end

spec/support/utilities.rb

include ApplicationHelper

Answer 1

不，字符串"foo"对RSpec没有任何特殊含义，它只是在测试中用作检查full_title帮助程序是否正常工作的示例。

要回答问题的其他部分，如果没有传入页面标题，则if语句将采用第一个路径，因为page_title变量为空，并且您将仅返回基本标题。以下是每个测试实际执行的操作：

# This is expected to return "Ruby on Rails Tutorial Sample App | foo", which
# will match /foo/.
it "should include the page title" do
  expect(full_title("foo")).to match(/foo/)
end

# This returns the same as above ("Ruby on Rails Tutorial Sample App | foo"),
# but this test is checking for the base title part instead of the "foo" part.
it "should include the base title" do
  expect(full_title("foo")).to match(/^Ruby on Rails Tutorial Sample App/)
end

# This returns just "Ruby on Rails Tutorial Sample App" because the page title
# is empty. This checks that the title doesn't contain a "|" character but that
# it only returns the base title.
it "should not include a bar for the home page" do
  expect(full_title("")).not_to match(/\|/)
end

Answer 2

这是可能对您有帮助的测试的“rspec to English”翻译：

如果我为full_title方法提供字符串"foo"，则结果应为：

包含"foo"
包含基本标题"Ruby on Rails Tutorial Sample App"
不是"|"

测试背后的想法是确保您的代码使用一些有意义的代码行为示例。您无法测试每种可能的情况，因此您选择一种（或多种）最佳方法来描述方法的功能。

在这种情况下，它会在编程中传递一个字符串参数"foo"，通常为used as a placeholder。

Rspec中有特殊含义的`foo`字符串吗？

2 个答案: