RSpec 3.0から3.3まで一気に上げたので独断と偏見で選んだ注目すべき新機能を紹介する ref: http://qiita.com/igrep/items/cd1d2ba8ce5ccb6f5f44

file0.rb

RSpec.configure do |c|
  c.example_status_persistence_file_path = "./tmp/rspec-example-status.txt"
end

file1.rb

RSpec.describe Client do
  let(:response) { Client.make_request }

  it "returns a successful JSON response" do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file1.txt

RSpec.describe Client do
  let(:response) { Client.make_request }

  it "returns a successful JSON response" do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file2.rb

RSpec.describe Client do
  let(:response) { Client.make_request }

  it "returns a successful JSON response", :aggregate_failures do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file2.txt

RSpec.describe Client do
  let(:response) { Client.make_request }

  it "returns a successful JSON response", :aggregate_failures do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file3.rb

RSpec.configure do |c|
  c.define_derived_metadata do |meta|
    meta[:aggregate_failures] = true unless meta.key?(:aggregate_failures)
  end
end

file3.txt

RSpec.configure do |c|
  c.define_derived_metadata do |meta|
    meta[:aggregate_failures] = true unless meta.key?(:aggregate_failures)
  end
end

file4.rb

# ここに書けばこのブロック内すべてのexampleが`aggregate_failures`されます。
RSpec.describe Client, aggregate_failures: false do
  let(:response) { Client.make_request }

  #                                        もちろん個別に指定してもOK!
  it "returns a successful JSON response", aggregate_failures: false do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file4.txt

# ここに書けばこのブロック内すべてのexampleが`aggregate_failures`されます。
RSpec.describe Client, aggregate_failures: false do
  let(:response) { Client.make_request }

  #                                        もちろん個別に指定してもOK!
  it "returns a successful JSON response", aggregate_failures: false do
    expect(response.status).to eq(200)
    expect(response.headers).to include("Content-Type" => "application/json")
    expect(response.body).to eq('{"message":"Success"}')
  end
end

file5.rb

expect { subject_method }.to raise_error

file6.rb

def just_hello
  puts "hello"
  frined.accept_hello_of(self)
rescue Exception
  warn "I JUST WANT TO SAY HELLO!! DON'T DISTURB!!"
end

file7.rb

it 'says hello to no other person' do
  expect(friend).not_to receive(:accept_hello_of)
  x.just_hello
end