rails/actionview/test/template/streaming_render_test.rb

# frozen_string_literal: true
require "abstract_unit"

class TestController < ActionController::Base
end

class FiberedTest < ActiveSupport::TestCase
  def setup
    view_paths = ActionController::Base.view_paths
    @assigns = { secret: "in the sauce", name: nil }
    @view = ActionView::Base.new(view_paths, @assigns)
    @controller_view = TestController.new.view_context
  end

  def render_body(options)
    @view.view_renderer.render_body(@view, options)
  end

  def buffered_render(options)
    body = render_body(options)
    string = ""
    body.each do |piece|
      string << piece
    end
    string
  end

  def test_streaming_works
    content = []
    body = render_body(template: "test/hello_world", layout: "layouts/yield")

    body.each do |piece|
      content << piece
    end

    assert_equal "<title>",      content[0]
    assert_equal "",             content[1]
    assert_equal "</title>\n",   content[2]
    assert_equal "Hello world!", content[3]
    assert_equal "\n",           content[4]
  end

  def test_render_file
    assert_equal "Hello world!", buffered_render(file: "test/hello_world")
  end

  def test_render_file_with_locals
    locals = { secret: "in the sauce" }
    assert_equal "The secret is in the sauce\n", buffered_render(file: "test/render_file_with_locals", locals: locals)
  end

  def test_render_partial
    assert_equal "only partial", buffered_render(partial: "test/partial_only")
  end

  def test_render_inline
    assert_equal "Hello, World!", buffered_render(inline: "Hello, World!")
  end

  def test_render_without_layout
    assert_equal "Hello world!", buffered_render(template: "test/hello_world")
  end

  def test_render_with_layout
    assert_equal %(<title></title>\nHello world!\n),
      buffered_render(template: "test/hello_world", layout: "layouts/yield")
  end

  def test_render_with_layout_which_has_render_inline
    assert_equal %(welcome\nHello world!\n),
      buffered_render(template: "test/hello_world", layout: "layouts/yield_with_render_inline_inside")
  end

  def test_render_with_layout_which_renders_another_partial
    assert_equal %(partial html\nHello world!\n),
      buffered_render(template: "test/hello_world", layout: "layouts/yield_with_render_partial_inside")
  end

  def test_render_with_nested_layout
    assert_equal %(<title>title</title>\n\n<div id="column">column</div>\n<div id="content">content</div>\n),
      buffered_render(template: "test/nested_layout", layout: "layouts/yield")
  end

  def test_render_with_file_in_layout
    assert_equal %(\n<title>title</title>\n\n),
      buffered_render(template: "test/layout_render_file")
  end

  def test_render_with_handler_without_streaming_support
    assert_match "<p>This is grand!</p>", buffered_render(template: "test/hello")
  end

  def test_render_with_streaming_multiple_yields_provide_and_content_for
    assert_equal "Yes, \nthis works\n like a charm.",
      buffered_render(template: "test/streaming", layout: "layouts/streaming")
  end

  def test_render_with_streaming_with_fake_yields_and_streaming_buster
    assert_equal "This won't look\n good.",
      buffered_render(template: "test/streaming_buster", layout: "layouts/streaming")
  end

  def test_render_with_nested_streaming_multiple_yields_provide_and_content_for
    assert_equal "?Yes, \n\nthis works\n\n? like a charm.",
      buffered_render(template: "test/nested_streaming", layout: "layouts/streaming")
  end

  def test_render_with_streaming_and_capture
    assert_equal "Yes, \n this works\n like a charm.",
      buffered_render(template: "test/streaming", layout: "layouts/streaming_with_capture")
  end
end