Feature: Standalone

  `require "rspec/mocks/standalone"` to expose the API at the top level (e.g. `main`) outside
  the RSpec environment. This is especially useful for exploring rspec-mocks in irb.

  Scenario: Allow a message outside RSpec
    Given a file named "example.rb" with:
      """ruby
      require "rspec/mocks/standalone"

      greeter = double("greeter")
      allow(greeter).to receive(:say_hi) { "Hello!" }
      puts greeter.say_hi
      """
    When I run `ruby example.rb`
    Then the output should contain "Hello!"

  Scenario: Expect a message outside RSpec
    Given a file named "example.rb" with:
      """ruby
      require "rspec/mocks/standalone"

      greeter = double("greeter")
      expect(greeter).to receive(:say_hi)

      RSpec::Mocks.verify
      """
    When I run `ruby example.rb`
    Then it should fail with the following output:
      | (Double "greeter").say_hi(any args)  |
      | RSpec::Mocks::MockExpectationError   |
      | expected: 1 time with any arguments  |
      | received: 0 times with any arguments |