你可以调出大部分的let，因为它们会被延迟计算。例如：

require 'rails_helper'

RSpec.describe '/widgets', type: :request do
  let(:valid_attributes) { attributes_for(:widget) }
  let(:invalid_attributes) { attributes_for(:widget, name: nil) }
  let(:valid_headers) { Devise::JWT::TestHelpers.auth_headers({}, user) }

  context 'with an admin user' do
    let(:user) { create(:user, is_admin: true) }

    describe 'GET /widgets' do
      it 'renders a successful response' do
        create(:widget)
        get widgets_url, headers: valid_headers, as: :json
        expect(response).to be_successful
      end
    end
  end

  context 'with a standard user' do
    let(:user) { create(:user) }

    describe 'GET /widgets' do
      it 'renders an unauthorized response' do
        create(:widget)
        get widgets_url, headers: valid_headers, as: :json
        expect(response).to have_http_status(403)
      end
    end
  end
end

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我会进一步反对“DRYing”。特别是测试应该详细说明他们所确保的功能。

您希望使用shared examples，甚至可能将其推到一个单独的文件中，
它将是这样的（注意，我还覆盖了subject来发出请求并返回request，这样您就可以使用is_expected.速记语法-如果您喜欢使用较长的expect(response).语法，则不需要这样做）

describe '/widgets', type: :request do
  let(:user_params) {{}}
  let(:user) { create(:user, user_params) }
  let(:valid_attributes) { attributes_for(:widget) }
  let(:invalid_attributes) { attributes_for(:widget, name: nil) }
  let(:valid_headers) { Devise::JWT::TestHelpers.auth_headers({}, user) }

  let(:params) { {} }
  let(:headers) { valid_headers }

  subject do
    process method, url, params: params, headers: headers, as: :json
    response
  end

  shared_examples "successful response" do
    it { is_expected.to have_http_status :ok }
  end

  shared_examples "unauthorized response" do
    it { is_expected.to have_http_status :forbidden }
  end

  describe "GET /widgets" do
    let(:method) { :get }
    let(:url) { "/widgets" }

    before { create(:widget) }

    context 'with an admin user' do
      let(:user_params) { { is_admin: true } }

      it_behaves_like "successful response"
    end

    context 'with a standard user' do
      it_behaves_like "unauthorized response"
    end
  end
end

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