Feature: must

  So that I can write accurate specifications
  As an RSpec user
  I want to be able to use #must instead of #should

  Scenario: #must with matching matcher
    Given a file named "must_matching_spec.rb" with:
      """
      require 'rspec'
      require 'rspec/must'

      describe true do
        it { must be_true }
      end
      """
    When I run `rspec must_matching_spec.rb`
    Then the example must pass

  Scenario: #must with non-matching matcher
    Given a file named "must_non-matching_spec.rb" with:
      """
      require 'rspec'
      require 'rspec/must'

      describe true do
        it { must be_false }
      end
      """
    When I run `rspec must_non-matching_spec.rb`
    Then the example must fail
    And the output must match /expected.+to be false/

  Scenario: #must_not with matching matcher
    Given a file named "must_not_matching_spec.rb" with:
      """
      require 'rspec'
      require 'rspec/must'

      describe true do
        it { must_not be_false }
      end
      """
    When I run `rspec must_not_matching_spec.rb`
    Then the example must pass

  Scenario: #must_not with non-matching matcher
    Given a file named "must_not_non-matching_spec.rb" with:
      """
      require 'rspec'
      require 'rspec/must'

      describe true do
        it { must_not be_true }
      end
      """
    When I run `rspec must_not_non-matching_spec.rb`
    Then the example must fail
    And the output must match /expected.+to be true/