特拉维斯 CI RSpec 测试。比较保持相同时间的变量

Question

我有这样的测试

  it 'could not update question' do
    old_title = question.title
    old_body = question.body
    old_updated_at = question.updated_at

    patch :update, id: question, question: attributes_for(:question, title: 'new valid title', body: 'new valid body'), format: :js
    question.reload

    expect(question.title).to eq old_title
    expect(question.body).to eq old_body
    expect(question.updated_at).to eq old_updated_at
  end

它引发错误：

1) QuestionsController PATCH #update question by someone else could not update question Failure/Error: expect(question.updated_at).to eq old_updated_at
   expected: 2016-04-09 18:05:03.650576201 +0000
        got: 2016-04-09 18:05:03.650576000 +0000

怎么会不一样呢？？在我的本地机器上它通过了

Answer 1

您或许可以改进测试的结构。考虑使用模拟和存根而不是测试状态突变（或缺乏状态突变）：

it 'could not update question' do
    expect(Question).to_not receive(:update)  # Depending on how your model gets updated
    patch :update, id: question, question: attributes_for(:question, title: 'new valid title', body: 'new valid body'), format: :js
end

Answer 2

你可以使用 ActiveSupport::Testing::TimeHelpers#travel

像这样将其包含在 rails_helper.rb 中：

RSpec.configure do |config|
include ActiveSupport::Testing::TimeHelpers
...

然后在你的测试中，使用travel_to Time.now来冻结时间。

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