rails--rails/actionview/test/template/dependency_tracker_test.rb

require 'abstract_unit'
require 'action_view/dependency_tracker'

class NeckbeardTracker
  def self.call(name, template)
    ["foo/#{name}"]
  end
end

class FakeTemplate
  attr_reader :source, :handler

  def initialize(source, handler = Neckbeard)
    @source, @handler = source, handler
  end
end

Neckbeard = lambda {|template| template.source }
Bowtie = lambda {|template| template.source }

class DependencyTrackerTest < ActionView::TestCase
  def tracker
    ActionView::DependencyTracker
  end

  def setup
    ActionView::Template.register_template_handler :neckbeard, Neckbeard
    tracker.register_tracker(:neckbeard, NeckbeardTracker)
  end

  def teardown
    tracker.remove_tracker(:neckbeard)
  end

  def test_finds_tracker_by_template_handler
    template = FakeTemplate.new("boo/hoo")
    dependencies = tracker.find_dependencies("boo/hoo", template)
    assert_equal ["foo/boo/hoo"], dependencies
  end

  def test_returns_empty_array_if_no_tracker_is_found
    template = FakeTemplate.new("boo/hoo", Bowtie)
    dependencies = tracker.find_dependencies("boo/hoo", template)
    assert_equal [], dependencies
  end
end

class ERBTrackerTest < Minitest::Test
  def make_tracker(name, template)
    ActionView::DependencyTracker::ERBTracker.new(name, template)
  end

  def test_dependency_of_erb_template_with_number_in_filename
    template = FakeTemplate.new("<%# render 'messages/message123' %>", :erb)
    tracker = make_tracker('messages/_message123', template)

    assert_equal ["messages/message123"], tracker.dependencies
  end

  def test_finds_dependency_in_correct_directory
    template = FakeTemplate.new("<%# render(message.topic) %>", :erb)
    tracker = make_tracker('messages/_message', template)

    assert_equal ["topics/topic"], tracker.dependencies
  end

  def test_finds_dependency_in_correct_directory_with_underscore
    template = FakeTemplate.new("<%# render(message_type.messages) %>", :erb)
    tracker = make_tracker('message_types/_message_type', template)

    assert_equal ["messages/message"], tracker.dependencies
  end
end