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diff --git a/actionpack/test/controller/mime/respond_to_test.rb b/actionpack/test/controller/mime/respond_to_test.rb
new file mode 100644
index 0000000000..00e1d5f3b3
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+++ b/actionpack/test/controller/mime/respond_to_test.rb
@@ -0,0 +1,877 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "active_support/log_subscriber/test_helper"
+
+class RespondToController < ActionController::Base
+  layout :set_layout
+
+  before_action {
+    case params[:v]
+    when String then request.variant = params[:v].to_sym
+    when Array then request.variant = params[:v].map(&:to_sym)
+    end
+  }
+
+  def html_xml_or_rss
+    respond_to do |type|
+      type.html { render body: "HTML"    }
+      type.xml  { render body: "XML"     }
+      type.rss  { render body: "RSS"     }
+      type.all  { render body: "Nothing" }
+    end
+  end
+
+  def js_or_html
+    respond_to do |type|
+      type.html { render body: "HTML"    }
+      type.js   { render body: "JS"      }
+      type.all  { render body: "Nothing" }
+    end
+  end
+
+  def json_or_yaml
+    respond_to do |type|
+      type.json { render body: "JSON" }
+      type.yaml { render body: "YAML" }
+    end
+  end
+
+  def html_or_xml
+    respond_to do |type|
+      type.html { render body: "HTML"    }
+      type.xml  { render body: "XML"     }
+      type.all  { render body: "Nothing" }
+    end
+  end
+
+  def json_xml_or_html
+    respond_to do |type|
+      type.json { render body: "JSON" }
+      type.xml { render xml: "XML" }
+      type.html { render body: "HTML" }
+    end
+  end
+
+  def forced_xml
+    request.format = :xml
+
+    respond_to do |type|
+      type.html { render body: "HTML"    }
+      type.xml  { render body: "XML"     }
+    end
+  end
+
+  def just_xml
+    respond_to do |type|
+      type.xml  { render body: "XML" }
+    end
+  end
+
+  def using_defaults
+    respond_to do |type|
+      type.html
+      type.xml
+    end
+  end
+
+  def missing_templates
+    respond_to do |type|
+      # This test requires a block that is empty
+      type.json { }
+      type.xml
+    end
+  end
+
+  def using_defaults_with_type_list
+    respond_to(:html, :xml)
+  end
+
+  def using_defaults_with_all
+    respond_to do |type|
+      type.html
+      type.all { render body: "ALL" }
+    end
+  end
+
+  def made_for_content_type
+    respond_to do |type|
+      type.rss  { render body: "RSS"  }
+      type.atom { render body: "ATOM" }
+      type.all  { render body: "Nothing" }
+    end
+  end
+
+  def using_conflicting_nested_js_then_html
+    respond_to do |outer_type|
+      outer_type.js do
+        respond_to do |inner_type|
+          inner_type.html { render body: "HTML" }
+        end
+      end
+    end
+  end
+
+  def using_non_conflicting_nested_js_then_js
+    respond_to do |outer_type|
+      outer_type.js do
+        respond_to do |inner_type|
+          inner_type.js { render body: "JS" }
+        end
+      end
+    end
+  end
+
+  def custom_type_handling
+    respond_to do |type|
+      type.html { render body: "HTML"    }
+      type.custom("application/crazy-xml")  { render body: "Crazy XML"  }
+      type.all  { render body: "Nothing" }
+    end
+  end
+
+  def custom_constant_handling
+    respond_to do |type|
+      type.html   { render body: "HTML"   }
+      type.mobile { render body: "Mobile" }
+    end
+  end
+
+  def custom_constant_handling_without_block
+    respond_to do |type|
+      type.html   { render body: "HTML"   }
+      type.mobile
+    end
+  end
+
+  def handle_any
+    respond_to do |type|
+      type.html { render body: "HTML" }
+      type.any(:js, :xml) { render body: "Either JS or XML" }
+    end
+  end
+
+  def handle_any_any
+    respond_to do |type|
+      type.html { render body: "HTML" }
+      type.any { render body: "Whatever you ask for, I got it" }
+    end
+  end
+
+  def all_types_with_layout
+    respond_to do |type|
+      type.html
+    end
+  end
+
+  def json_with_callback
+    respond_to do |type|
+      type.json { render json: "JS", callback: "alert" }
+    end
+  end
+
+  def iphone_with_html_response_type
+    request.format = :iphone if request.env["HTTP_ACCEPT"] == "text/iphone"
+
+    respond_to do |type|
+      type.html   { @type = "Firefox" }
+      type.iphone { @type = "iPhone"  }
+    end
+  end
+
+  def iphone_with_html_response_type_without_layout
+    request.format = "iphone" if request.env["HTTP_ACCEPT"] == "text/iphone"
+
+    respond_to do |type|
+      type.html   { @type = "Firefox"; render action: "iphone_with_html_response_type" }
+      type.iphone { @type = "iPhone" ; render action: "iphone_with_html_response_type" }
+    end
+  end
+
+  def variant_with_implicit_template_rendering
+    # This has exactly one variant template defined in the file system (+mobile.html.erb),
+    # which raises the regular MissingTemplate error for other variants.
+  end
+
+  def variant_without_implicit_template_rendering
+    # This differs from the above in that it does not have any templates defined in the file
+    # system, which triggers the ImplicitRender (204 No Content) behavior.
+  end
+
+  def variant_with_format_and_custom_render
+    request.variant = :mobile
+
+    respond_to do |type|
+      type.html { render body: "mobile" }
+    end
+  end
+
+  def multiple_variants_for_format
+    respond_to do |type|
+      type.html do |html|
+        html.tablet { render body: "tablet" }
+        html.phone  { render body: "phone" }
+      end
+    end
+  end
+
+  def variant_plus_none_for_format
+    respond_to do |format|
+      format.html do |variant|
+        variant.phone { render body: "phone" }
+        variant.none
+      end
+    end
+  end
+
+  def variant_inline_syntax
+    respond_to do |format|
+      format.js         { render body: "js"    }
+      format.html.none  { render body: "none"  }
+      format.html.phone { render body: "phone" }
+    end
+  end
+
+  def variant_inline_syntax_without_block
+    respond_to do |format|
+      format.js
+      format.html.none
+      format.html.phone
+    end
+  end
+
+  def variant_any
+    respond_to do |format|
+      format.html do |variant|
+        variant.any(:tablet, :phablet) { render body: "any" }
+        variant.phone { render body: "phone" }
+      end
+    end
+  end
+
+  def variant_any_any
+    respond_to do |format|
+      format.html do |variant|
+        variant.any   { render body: "any"   }
+        variant.phone { render body: "phone" }
+      end
+    end
+  end
+
+  def variant_inline_any
+    respond_to do |format|
+      format.html.any(:tablet, :phablet) { render body: "any" }
+      format.html.phone { render body: "phone" }
+    end
+  end
+
+  def variant_inline_any_any
+    respond_to do |format|
+      format.html.phone { render body: "phone" }
+      format.html.any   { render body: "any"   }
+    end
+  end
+
+  def variant_any_implicit_render
+    respond_to do |format|
+      format.html.phone
+      format.html.any(:tablet, :phablet)
+    end
+  end
+
+  def variant_any_with_none
+    respond_to do |format|
+      format.html.any(:none, :phone) { render body: "none or phone" }
+    end
+  end
+
+  def format_any_variant_any
+    respond_to do |format|
+      format.html { render body: "HTML" }
+      format.any(:js, :xml) do |variant|
+        variant.phone { render body: "phone" }
+        variant.any(:tablet, :phablet) { render body: "tablet" }
+      end
+    end
+  end
+
+  private
+    def set_layout
+      case action_name
+      when "all_types_with_layout", "iphone_with_html_response_type"
+        "respond_to/layouts/standard"
+      when "iphone_with_html_response_type_without_layout"
+        "respond_to/layouts/missing"
+      end
+    end
+end
+
+class RespondToControllerTest < ActionController::TestCase
+  NO_CONTENT_WARNING = "No template found for RespondToController#variant_without_implicit_template_rendering, rendering head :no_content"
+
+  def setup
+    super
+    @request.host = "www.example.com"
+    Mime::Type.register_alias("text/html", :iphone)
+    Mime::Type.register("text/x-mobile", :mobile)
+  end
+
+  def teardown
+    super
+    Mime::Type.unregister(:iphone)
+    Mime::Type.unregister(:mobile)
+  end
+
+  def test_html
+    @request.accept = "text/html"
+    get :js_or_html
+    assert_equal "HTML", @response.body
+
+    get :html_or_xml
+    assert_equal "HTML", @response.body
+
+    assert_raises(ActionController::UnknownFormat) do
+      get :just_xml
+    end
+  end
+
+  def test_all
+    @request.accept = "*/*"
+    get :js_or_html
+    assert_equal "HTML", @response.body # js is not part of all
+
+    get :html_or_xml
+    assert_equal "HTML", @response.body
+
+    get :just_xml
+    assert_equal "XML", @response.body
+  end
+
+  def test_xml
+    @request.accept = "application/xml"
+    get :html_xml_or_rss
+    assert_equal "XML", @response.body
+  end
+
+  def test_js_or_html
+    @request.accept = "text/javascript, text/html"
+    get :js_or_html, xhr: true
+    assert_equal "JS", @response.body
+
+    @request.accept = "text/javascript, text/html"
+    get :html_or_xml, xhr: true
+    assert_equal "HTML", @response.body
+
+    @request.accept = "text/javascript, text/html"
+
+    assert_raises(ActionController::UnknownFormat) do
+      get :just_xml, xhr: true
+    end
+  end
+
+  def test_json_or_yaml_with_leading_star_star
+    @request.accept = "*/*, application/json"
+    get :json_xml_or_html
+    assert_equal "HTML", @response.body
+
+    @request.accept = "*/* , application/json"
+    get :json_xml_or_html
+    assert_equal "HTML", @response.body
+  end
+
+  def test_json_or_yaml
+    get :json_or_yaml, xhr: true
+    assert_equal "JSON", @response.body
+
+    get :json_or_yaml, format: "json"
+    assert_equal "JSON", @response.body
+
+    get :json_or_yaml, format: "yaml"
+    assert_equal "YAML", @response.body
+
+    { "YAML" => %w(text/yaml),
+      "JSON" => %w(application/json text/x-json)
+    }.each do |body, content_types|
+      content_types.each do |content_type|
+        @request.accept = content_type
+        get :json_or_yaml
+        assert_equal body, @response.body
+      end
+    end
+  end
+
+  def test_js_or_anything
+    @request.accept = "text/javascript, */*"
+    get :js_or_html, xhr: true
+    assert_equal "JS", @response.body
+
+    get :html_or_xml, xhr: true
+    assert_equal "HTML", @response.body
+
+    get :just_xml, xhr: true
+    assert_equal "XML", @response.body
+  end
+
+  def test_using_defaults
+    @request.accept = "*/*"
+    get :using_defaults
+    assert_equal "text/html", @response.content_type
+    assert_equal "Hello world!", @response.body
+
+    @request.accept = "application/xml"
+    get :using_defaults
+    assert_equal "application/xml", @response.content_type
+    assert_equal "<p>Hello world!</p>\n", @response.body
+  end
+
+  def test_using_defaults_with_all
+    @request.accept = "*/*"
+    get :using_defaults_with_all
+    assert_equal "HTML!", @response.body.strip
+
+    @request.accept = "text/html"
+    get :using_defaults_with_all
+    assert_equal "HTML!", @response.body.strip
+
+    @request.accept = "application/json"
+    get :using_defaults_with_all
+    assert_equal "ALL", @response.body
+  end
+
+  def test_using_defaults_with_type_list
+    @request.accept = "*/*"
+    get :using_defaults_with_type_list
+    assert_equal "text/html", @response.content_type
+    assert_equal "Hello world!", @response.body
+
+    @request.accept = "application/xml"
+    get :using_defaults_with_type_list
+    assert_equal "application/xml", @response.content_type
+    assert_equal "<p>Hello world!</p>\n", @response.body
+  end
+
+  def test_using_conflicting_nested_js_then_html
+    @request.accept = "*/*"
+    assert_raises(ActionController::RespondToMismatchError) do
+      get :using_conflicting_nested_js_then_html
+    end
+  end
+
+  def test_using_non_conflicting_nested_js_then_js
+    @request.accept = "*/*"
+    get :using_non_conflicting_nested_js_then_js
+    assert_equal "text/javascript", @response.content_type
+    assert_equal "JS", @response.body
+  end
+
+  def test_with_atom_content_type
+    @request.accept = ""
+    @request.env["CONTENT_TYPE"] = "application/atom+xml"
+    get :made_for_content_type, xhr: true
+    assert_equal "ATOM", @response.body
+  end
+
+  def test_with_rss_content_type
+    @request.accept = ""
+    @request.env["CONTENT_TYPE"] = "application/rss+xml"
+    get :made_for_content_type, xhr: true
+    assert_equal "RSS", @response.body
+  end
+
+  def test_synonyms
+    @request.accept = "application/javascript"
+    get :js_or_html
+    assert_equal "JS", @response.body
+
+    @request.accept = "application/x-xml"
+    get :html_xml_or_rss
+    assert_equal "XML", @response.body
+  end
+
+  def test_custom_types
+    @request.accept = "application/crazy-xml"
+    get :custom_type_handling
+    assert_equal "application/crazy-xml", @response.content_type
+    assert_equal "Crazy XML", @response.body
+
+    @request.accept = "text/html"
+    get :custom_type_handling
+    assert_equal "text/html", @response.content_type
+    assert_equal "HTML", @response.body
+  end
+
+  def test_xhtml_alias
+    @request.accept = "application/xhtml+xml,application/xml"
+    get :html_or_xml
+    assert_equal "HTML", @response.body
+  end
+
+  def test_firefox_simulation
+    @request.accept = "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"
+    get :html_or_xml
+    assert_equal "HTML", @response.body
+  end
+
+  def test_handle_any
+    @request.accept = "*/*"
+    get :handle_any
+    assert_equal "HTML", @response.body
+
+    @request.accept = "text/javascript"
+    get :handle_any
+    assert_equal "Either JS or XML", @response.body
+
+    @request.accept = "text/xml"
+    get :handle_any
+    assert_equal "Either JS or XML", @response.body
+  end
+
+  def test_handle_any_any
+    @request.accept = "*/*"
+    get :handle_any_any
+    assert_equal "HTML", @response.body
+  end
+
+  def test_handle_any_any_parameter_format
+    get :handle_any_any, format: "html"
+    assert_equal "HTML", @response.body
+  end
+
+  def test_handle_any_any_explicit_html
+    @request.accept = "text/html"
+    get :handle_any_any
+    assert_equal "HTML", @response.body
+  end
+
+  def test_handle_any_any_javascript
+    @request.accept = "text/javascript"
+    get :handle_any_any
+    assert_equal "Whatever you ask for, I got it", @response.body
+  end
+
+  def test_handle_any_any_xml
+    @request.accept = "text/xml"
+    get :handle_any_any
+    assert_equal "Whatever you ask for, I got it", @response.body
+  end
+
+  def test_handle_any_any_unknown_format
+    get :handle_any_any, format: "php"
+    assert_equal "Whatever you ask for, I got it", @response.body
+  end
+
+  def test_browser_check_with_any_any
+    @request.accept = "application/json, application/xml"
+    get :json_xml_or_html
+    assert_equal "JSON", @response.body
+
+    @request.accept = "application/json, application/xml, */*"
+    get :json_xml_or_html
+    assert_equal "HTML", @response.body
+  end
+
+  def test_html_type_with_layout
+    @request.accept = "text/html"
+    get :all_types_with_layout
+    assert_equal '<html><div id="html">HTML for all_types_with_layout</div></html>', @response.body
+  end
+
+  def test_json_with_callback_sets_javascript_content_type
+    @request.accept = "application/json"
+    get :json_with_callback
+    assert_equal "/**/alert(JS)", @response.body
+    assert_equal "text/javascript", @response.content_type
+  end
+
+  def test_xhr
+    get :js_or_html, xhr: true
+    assert_equal "JS", @response.body
+  end
+
+  def test_custom_constant
+    get :custom_constant_handling, format: "mobile"
+    assert_equal "text/x-mobile", @response.content_type
+    assert_equal "Mobile", @response.body
+  end
+
+  def test_custom_constant_handling_without_block
+    get :custom_constant_handling_without_block, format: "mobile"
+    assert_equal "text/x-mobile", @response.content_type
+    assert_equal "Mobile", @response.body
+  end
+
+  def test_forced_format
+    get :html_xml_or_rss
+    assert_equal "HTML", @response.body
+
+    get :html_xml_or_rss, format: "html"
+    assert_equal "HTML", @response.body
+
+    get :html_xml_or_rss, format: "xml"
+    assert_equal "XML", @response.body
+
+    get :html_xml_or_rss, format: "rss"
+    assert_equal "RSS", @response.body
+  end
+
+  def test_internally_forced_format
+    get :forced_xml
+    assert_equal "XML", @response.body
+
+    get :forced_xml, format: "html"
+    assert_equal "XML", @response.body
+  end
+
+  def test_extension_synonyms
+    get :html_xml_or_rss, format: "xhtml"
+    assert_equal "HTML", @response.body
+  end
+
+  def test_render_action_for_html
+    @controller.instance_eval do
+      def render(*args)
+        @action = args.first[:action] unless args.empty?
+        @action ||= action_name
+
+        response.body = "#{@action} - #{formats}"
+      end
+    end
+
+    get :using_defaults
+    assert_equal "using_defaults - #{[:html]}", @response.body
+
+    get :using_defaults, format: "xml"
+    assert_equal "using_defaults - #{[:xml]}", @response.body
+  end
+
+  def test_format_with_custom_response_type
+    get :iphone_with_html_response_type
+    assert_equal '<html><div id="html">Hello future from Firefox!</div></html>', @response.body
+
+    get :iphone_with_html_response_type, format: "iphone"
+    assert_equal "text/html", @response.content_type
+    assert_equal '<html><div id="iphone">Hello iPhone future from iPhone!</div></html>', @response.body
+  end
+
+  def test_format_with_custom_response_type_and_request_headers
+    @request.accept = "text/iphone"
+    get :iphone_with_html_response_type
+    assert_equal '<html><div id="iphone">Hello iPhone future from iPhone!</div></html>', @response.body
+    assert_equal "text/html", @response.content_type
+  end
+
+  def test_invalid_format
+    assert_raises(ActionController::UnknownFormat) do
+      get :using_defaults, format: "invalidformat"
+    end
+  end
+
+  def test_missing_templates
+    get :missing_templates, format: :json
+    assert_response :no_content
+    get :missing_templates, format: :xml
+    assert_response :no_content
+  end
+
+  def test_invalid_variant
+    assert_raises(ActionController::UnknownFormat) do
+      get :variant_with_implicit_template_rendering, params: { v: :invalid }
+    end
+  end
+
+  def test_variant_not_set_regular_unknown_format
+    assert_raises(ActionController::UnknownFormat) do
+      get :variant_with_implicit_template_rendering
+    end
+  end
+
+  def test_variant_with_implicit_template_rendering
+    get :variant_with_implicit_template_rendering, params: { v: :mobile }
+    assert_equal "text/html", @response.content_type
+    assert_equal "mobile", @response.body
+  end
+
+  def test_variant_without_implicit_rendering_from_browser
+    assert_raises(ActionController::MissingExactTemplate) do
+      get :variant_without_implicit_template_rendering, params: { v: :does_not_matter }
+    end
+  end
+
+  def test_variant_variant_not_set_and_without_implicit_rendering_from_browser
+    assert_raises(ActionController::MissingExactTemplate) do
+      get :variant_without_implicit_template_rendering
+    end
+  end
+
+  def test_variant_without_implicit_rendering_from_xhr
+    logger = ActiveSupport::LogSubscriber::TestHelper::MockLogger.new
+    old_logger, ActionController::Base.logger = ActionController::Base.logger, logger
+
+    get :variant_without_implicit_template_rendering, xhr: true, params: { v: :does_not_matter }
+    assert_response :no_content
+
+    assert_equal 1, logger.logged(:info).select { |s| s == NO_CONTENT_WARNING }.size, "Implicit head :no_content not logged"
+  ensure
+    ActionController::Base.logger = old_logger
+  end
+
+  def test_variant_without_implicit_rendering_from_api
+    logger = ActiveSupport::LogSubscriber::TestHelper::MockLogger.new
+    old_logger, ActionController::Base.logger = ActionController::Base.logger, logger
+
+    get :variant_without_implicit_template_rendering, format: "json", params: { v: :does_not_matter }
+    assert_response :no_content
+
+    assert_equal 1, logger.logged(:info).select { |s| s == NO_CONTENT_WARNING }.size, "Implicit head :no_content not logged"
+  ensure
+    ActionController::Base.logger = old_logger
+  end
+
+  def test_variant_variant_not_set_and_without_implicit_rendering_from_xhr
+    logger = ActiveSupport::LogSubscriber::TestHelper::MockLogger.new
+    old_logger, ActionController::Base.logger = ActionController::Base.logger, logger
+
+    get :variant_without_implicit_template_rendering, xhr: true
+    assert_response :no_content
+
+    assert_equal 1, logger.logged(:info).select { |s| s == NO_CONTENT_WARNING }.size, "Implicit head :no_content not logged"
+  ensure
+    ActionController::Base.logger = old_logger
+  end
+
+  def test_variant_with_format_and_custom_render
+    get :variant_with_format_and_custom_render, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "mobile", @response.body
+  end
+
+  def test_multiple_variants_for_format
+    get :multiple_variants_for_format, params: { v: :tablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "tablet", @response.body
+  end
+
+  def test_no_variant_in_variant_setup
+    get :variant_plus_none_for_format
+    assert_equal "text/html", @response.content_type
+    assert_equal "none", @response.body
+  end
+
+  def test_variant_inline_syntax
+    get :variant_inline_syntax
+    assert_equal "text/html", @response.content_type
+    assert_equal "none", @response.body
+
+    get :variant_inline_syntax, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_inline_syntax_with_format
+    get :variant_inline_syntax, format: :js
+    assert_equal "text/javascript", @response.content_type
+    assert_equal "js", @response.body
+  end
+
+  def test_variant_inline_syntax_without_block
+    get :variant_inline_syntax_without_block, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_any
+    get :variant_any, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+
+    get :variant_any, params: { v: :tablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+
+    get :variant_any, params: { v: :phablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+  end
+
+  def test_variant_any_any
+    get :variant_any_any
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+
+    get :variant_any_any, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+
+    get :variant_any_any, params: { v: :yolo }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+  end
+
+  def test_variant_inline_any
+    get :variant_any, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+
+    get :variant_inline_any, params: { v: :tablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+
+    get :variant_inline_any, params: { v: :phablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+  end
+
+  def test_variant_inline_any_any
+    get :variant_inline_any_any, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+
+    get :variant_inline_any_any, params: { v: :yolo }
+    assert_equal "text/html", @response.content_type
+    assert_equal "any", @response.body
+  end
+
+  def test_variant_any_implicit_render
+    get :variant_any_implicit_render, params: { v: :tablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "tablet", @response.body
+
+    get :variant_any_implicit_render, params: { v: :phablet }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phablet", @response.body
+  end
+
+  def test_variant_any_with_none
+    get :variant_any_with_none
+    assert_equal "text/html", @response.content_type
+    assert_equal "none or phone", @response.body
+
+    get :variant_any_with_none, params: { v: :phone }
+    assert_equal "text/html", @response.content_type
+    assert_equal "none or phone", @response.body
+  end
+
+  def test_format_any_variant_any
+    get :format_any_variant_any, format: :js, params: { v: :tablet }
+    assert_equal "text/javascript", @response.content_type
+    assert_equal "tablet", @response.body
+  end
+
+  def test_variant_negotiation_inline_syntax
+    get :variant_inline_syntax_without_block, params: { v: [:tablet, :phone] }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_negotiation_block_syntax
+    get :variant_plus_none_for_format, params: { v: [:tablet, :phone] }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_negotiation_without_block
+    get :variant_inline_syntax_without_block, params: { v: [:tablet, :phone] }
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+end