ruby-on-rails - RSpec - 日期应该在两个日期之间

Question

如何测试日期以查看它是否在两个日期之间？我知道我可以进行两次大于和小于比较，但我想要一个 RSpec 方法来检查日期的“中间值”。

例如：

it "is between the time range" do
    expect(Date.now).to be_between(Date.yesterday, Date.tomorrow)
end

我试过expect(range).to cover(subject)但没有运气。

Answer 1

Date.today.should be_between(Date.today - 1.day, Date.today + 1.day)

Answer 2

您编写的两种语法都是正确的 RSpec：

it 'is between the time range' do
  expect(Date.today).to be_between(Date.yesterday, Date.tomorrow)
end

it 'is between the time range' do
  expect(Date.yesterday..Date.tomorrow).to cover Date.today
end

如果您不使用 Rails，您将不会拥有Date::yesterday或Date::tomorrow定义。您需要手动调整它：

it 'is between the time range' do
  expect(Date.today).to be_between(Date.today - 1, Date.today + 1)
end

由于 RSpec 的内置谓词匹配器，第一个版本有效。这个匹配器理解在对象上定义的方法，并委托给它们以及可能的?版本。对于Date，谓词Date#between?来自包括Comparable（见链接）。

第二个版本有效，因为 RSpec 定义了覆盖匹配器。

Answer 3

我自己没有尝试过，但根据这个你应该使用它有点不同：

it "is between the time range" do    
  (Date.yesterday..Date.tomorrow).should cover(Date.now)
end

Answer 4

你必须定义一个匹配器，检查https://github.com/dchelimsky/rspec/wiki/Custom-Matchers

它可能是

RSpec::Matchers.define :be_between do |expected|
  match do |actual|
    actual[:bottom] <= expected && actual[:top] >= expected
  end
end

它让你

it "is between the time range" do
    expect(Date.now).to be_between(:bottom => Date.yesterday, :top => Date.tomorrow)
end