ruby-on-rails - 如何 stub Time.now.hour

Question

我有一个辅助方法，它在等待时间的 View 中输出问候语 #{greet(Time.now.hour)}:

users_helper.rb:

def greet(hour_of_clock)
 if hour_of_clock >= 1 && hour_of_clock <= 11
  "Morning"
 elsif hour_of_clock >= 12 && hour_of_clock <= 16
  "Afternoon"
 else
  "Evening"
 end
end

我正在尝试如下测试失败:

users_feature_spec.rb

describe 'greeting a newly registered user' do
  before do 
    @fake_time = Time.parse("11:00")
    Time.stub(:now) { @fake_time }
  end
  it 'tailors the greeting to the time of day' do
    visit '/'
    fill_in 'Name here...', with: 'test name'
    fill_in 'Your email here...', with: 'test@test.com'
    click_button 'Notify me'

    expect(page).to have_content 'Morning'
  end
end

测试失败，因为 Time.now.hour 没有像上面预期的那样被 stub 。

由于各种建议，我现在已经尝试了各种变体，至少在语法上看起来是正确的两个主要重新格式化是:

describe 'greeting a newly registered user' do
  before do 
    @fake_time =  Time.parse("11:00")
    allow(Time).to receive(:now).and_return(@fake_time)  
  end
  it 'tailors the greeting to the time of day' do
      visit '/'
      fill_in 'Name here...', with: 'test name'
      fill_in 'Your email here...', with: 'test@test.com'
      click_button 'Notify me'

      expect(page).to have_content 'Morning'
    end
  end

并使用新的 ActiveSupport::Testing::TimeHelpers 方法#travel_to:

describe 'greeting a newly registered user' do
  it 'tailors the greeting to the time of day' do
    travel_to Time.new(2013, 11, 24, 01, 04, 44) do
      visit '/'
      fill_in 'Name here...', with: 'test name'
      fill_in 'Your email here...', with: 'test@test.com'
      click_button 'Notify me'

      expect(page).to have_content 'Morning'
    end
  end

但我仍然做错了什么，这意味着 #greet 仍在获取 Time.now.hour 的实时输出，而不是使用我的 stubbed 或 travel_to Time值(value)。有什么帮助吗？

Answer 1

你可以试试这个:

let!(:fake_hour) { '11' }
before do 
  allow(Time).to receive_message_chain(:now, :hour).and_return(fake_hour)
end