require 'test_helper'
require 'tempfile'

class TestFrameworkDetectionTest < Test::Unit::TestCase
  if CURRENT_APPRAISAL_NAME == 'rails_4_1'
    should 'detect Minitest 5.x w/ Rails 4.1' do
      assert_integration_with_rails_and 'Minitest::Test', 'Minitest::Unit::TestCase'
    end
  end

  if CURRENT_APPRAISAL_NAME == 'rails_4_0'
    should 'detect ActiveSupport::TestCase and Minitest 4.x w/ Rails 4.0' do
      assert_integration_with_rails_and 'MiniTest::Unit::TestCase'
    end
  end

  if CURRENT_APPRAISAL_NAME == 'rails_3_2'
    should 'detect ActiveSupport::TestCase and Test::Unit::TestCase w/ Rails 3.2' do
      assert_integration_with_rails_and 'Test::Unit::TestCase'
    end
  end

  if CURRENT_APPRAISAL_NAME == 'rails_3_1'
    should 'detect ActiveSupport::TestCase and Test::Unit::TestCase w/ Rails 3.1' do
      assert_integration_with_rails_and 'Test::Unit::TestCase'
    end
  end

  if CURRENT_APPRAISAL_NAME == 'rails_3_0'
    should 'detect ActiveSupport::TestCase and Test::Unit::TestCase w/ Rails 3.0' do
      assert_integration_with_rails_and 'Test::Unit::TestCase'
    end
  end

  if CURRENT_APPRAISAL_NAME == 'minitest_5_x'
    should 'detect Minitest 5.x when it is loaded standalone' do
      assert_integration_with 'Minitest::Test', 'Minitest::Unit::TestCase',
        setup: <<-RUBY
          require 'minitest/autorun'
        RUBY
    end
  end

  if CURRENT_APPRAISAL_NAME == 'minitest_4_x'
    should 'detect Minitest 4.x when it is loaded standalone' do
      assert_integration_with 'MiniTest::Unit::TestCase',
        setup: <<-RUBY
          require 'minitest/autorun'
        RUBY
    end
  end

  if CURRENT_APPRAISAL_NAME == 'test_unit'
    should 'detect the test-unit gem when it is loaded standalone' do
      assert_integration_with 'Test::Unit::TestCase',
        setup: <<-RUBY
          require 'test/unit'
        RUBY
    end
  end

  def assert_integration_with(*test_cases)
    assert_test_cases_are_detected(*test_cases)
    assert_our_api_is_available_in_test_cases(*test_cases)
  end

  def assert_integration_with_rails_and(*test_cases)
    test_cases = ['ActiveSupport::TestCase'] | test_cases
    options = test_cases.last.is_a?(Hash) ? test_cases.pop : {}
    options[:setup] = <<-RUBY
      require 'rails/all'
      require 'rails/test_help'
      ActiveRecord::Base.establish_connection(
        adapter: 'sqlite3',
        database: ':memory:'
      )
    RUBY
    args = test_cases + [options]

    assert_integration_with(*args)
  end

  def assert_test_cases_are_detected(*expected_test_cases)
    options = expected_test_cases.last.is_a?(Hash) ? expected_test_cases.pop : {}
    setup = options[:setup] || ''
    output = execute(file_that_detects_test_framework_test_cases([setup]))
    actual_test_cases = output.split("\n").first.split(', ')
    assert_equal expected_test_cases, actual_test_cases
  end

  def file_that_detects_test_framework_test_cases(mixins)
    <<-RUBY
      #{require_gems(mixins)}
      require 'yaml'
      test_cases = Shoulda::Context.test_framework_test_cases.map { |test_case| test_case.to_s }
      puts test_cases.join(', ')
    RUBY
  end

  def require_gems(mixins)
    <<-RUBY
      ENV['BUNDLE_GEMFILE'] = "#{PROJECT_DIR}/gemfiles/#{CURRENT_APPRAISAL_NAME}.gemfile"
      require 'bundler'
      Bundler.setup
      #{mixins.join("\n")}
      require 'shoulda-context'
    RUBY
  end

  def assert_our_api_is_available_in_test_cases(*test_cases)
    options = test_cases.last.is_a?(Hash) ? test_cases.pop : {}
    setup = options[:setup] || ''

    test_cases.each do |test_case|
      output = execute(file_that_runs_a_test_within_test_case(test_case, [setup]))
      assert_match /1 (tests|runs)/, output
      assert_match /1 assertions/, output
      assert_match /0 failures/, output
      assert_match /0 errors/, output
    end
  end

  def file_that_runs_a_test_within_test_case(test_case, mixins)
    <<-RUBY
      #{require_gems(mixins)}

      class FrameworkIntegrationTest < #{test_case}
        context 'a context' do
          should 'have a test' do
            assert_equal true, true
          end
        end
      end
    RUBY
  end

  def execute(code)
    tempfile = Tempfile.new('shoulda-context-test')
    tempfile.write(code)
    tempfile.close

    if ENV['DEBUG']
      puts 'Code:'
      puts code
    end

    output = `RUBYOPT='' ruby #{tempfile.path} 2>&1`
    if ENV['DEBUG']
      puts 'Output:'
      puts output
    end
    output
  end
end