Variant negotiation

Allow setting `request.variant` as an array - an order in which they will be
rendered.

For example:

  request.variant = [:tablet, :phone]

  respond_to do |format|
    format.html.none
    format.html.phone # this gets rendered
  end

1 files changed, 21 insertions, 0 deletions

diff --git a/actionpack/test/controller/mime/respond_to_test.rb b/actionpack/test/controller/mime/respond_to_test.rb
index 84e4936f31..2f05017ec9 100644
--- a/actionpack/test/controller/mime/respond_to_test.rb
+++ b/actionpack/test/controller/mime/respond_to_test.rb
@@ -740,4 +740,25 @@ class RespondToControllerTest < ActionController::TestCase
     assert_equal "text/javascript", @response.content_type
     assert_equal "tablet", @response.body
   end
+
+  def test_variant_negotiation_inline_syntax
+    @request.variant = [:tablet, :phone]
+    get :variant_inline_syntax_without_block
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_negotiation_block_syntax
+    @request.variant = [:tablet, :phone]
+    get :variant_plus_none_for_format
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
+
+  def test_variant_negotiation_without_block
+    @request.variant = [:tablet, :phone]
+    get :variant_inline_syntax_without_block
+    assert_equal "text/html", @response.content_type
+    assert_equal "phone", @response.body
+  end
 end