source "https://rubygems.org"

 gem 'rest-client'
 gem 'rspec'
 gem 'json_expressions'

rafs-computer:rafael$ bundle
Using diff-lcs 1.2.5
Using json_expressions 0.8.3
Using mime-types 2.3
Using netrc 0.7.7
Using rest-client 1.7.2
Using rspec-support 3.1.1
Using rspec-core 3.1.4
Using rspec-expectations 3.1.2
Using rspec-mocks 3.1.2
Using rspec 3.1.0
Using bundler 1.7.3
Your bundle is complete!

require 'rspec'
require 'rest_client'

describe 'GitHub API' do
  
  it 'should return information about a user' do 
    result = RestClient.get 'https://api.github.com/users/rest-client', :content_type => :json, :accept => :json
    expect(result.code).to eq(200)
  end

end

{
 "login": "rest-client",
 "id": 2386701,
 "avatar_url": "https://avatars.githubusercontent.com/u/2386701?v=3",
 "gravatar_id": "",
 "url": "https://api.github.com/users/rest-client",
 "html_url": "https://github.com/rest-client",
 "followers_url": "https://api.github.com/users/rest-client/followers",
 "following_url": "https://api.github.com/users/rest-client/following{/other_user}",
 "gists_url": "https://api.github.com/users/rest-client/gists{/gist_id}",
 "starred_url": "https://api.github.com/users/rest-client/starred{/owner}{/repo}",
 "subscriptions_url": "https://api.github.com/users/rest-client/subscriptions",
 "organizations_url": "https://api.github.com/users/rest-client/orgs",
 "repos_url": "https://api.github.com/users/rest-client/repos",
 "events_url": "https://api.github.com/users/rest-client/events{/privacy}",
 "received_events_url": "https://api.github.com/users/rest-client/received_events",
 "type": "Organization",
 "site_admin": false,
 "name": "REST-Client Team",
 "company": null,
 "blog": "",
 "location": null,
 "email": null,
 "hireable": false,
 "bio": null,
 "public_repos": 1,
 "public_gists": 0,
 "followers": 0,
 "following": 0,
 "created_at": "2012-09-20T15:01:43Z",
 "updated_at": "2015-03-11T19:08:01Z"
}

require 'rspec'
require 'rest_client'
require 'json_expressions/rspec'


describe 'GitHub API' do

 it 'should return 200 when asking information about a user' do
  result = RestClient.get 'https://api.github.com/users/rest-client', :content_type => :json, :accept => :json
  expect(result.code).to eq(200)
 end

 it 'should return proper data for a user' do
  expected_data = JSON.parse(IO.read('users.json'))
  result = RestClient.get 'https://api.github.com/users/rest-client', :content_type => :json, :accept => :json
  expect(result).to match_json_expression(expected_data) 
 end

end

it 'should return proper data for a user' do
  expected_data = JSON.parse(IO.read('users.json')) #解析users.json文件中的数据作为预期值 
  result = RestClient.get 'https://api.github.com/users/rest-client', :content_type => :json, :accept => :json
  # expect(result).to match_json_expression(expected_data) 
  expected_data['updated_at'] = wildcard_matcher
 end