如何编写按指定日期范围过滤帖子的rspec

require 'rspec'
require 'date'
require_relative 'post' # 假设有一个名为Post的类用于表示帖子

RSpec.describe 'Filtering posts by date range' do
  let(:posts) do
    [
      Post.new('Post 1', Date.new(2022, 1, 1)),
      Post.new('Post 2', Date.new(2022, 1, 15)),
      Post.new('Post 3', Date.new(2022, 2, 1))
    ]
  end

  it 'returns posts within the specified date range' do
    start_date = Date.new(2022, 1, 1)
    end_date = Date.new(2022, 1, 31)

    filtered_posts = posts.select { |post| post.date >= start_date && post.date <= end_date }

    expect(filtered_posts.length).to eq(2)
    expect(filtered_posts.map(&:title)).to contain_exactly('Post 1', 'Post 2')
  end

  it 'returns an empty array if no posts are within the specified date range' do
    start_date = Date.new(2022, 3, 1)
    end_date = Date.new(2022, 3, 31)

    filtered_posts = posts.select { |post| post.date >= start_date && post.date <= end_date }

    expect(filtered_posts).to be_empty
  end
end

rspec posts_spec.rb