1 files changed, 42 insertions, 1 deletions
diff --git a/actionpack/test/assertions/response_assertions_test.rb b/actionpack/test/assertions/response_assertions_test.rb
index 82c747680d..841fa6aaad 100644
--- a/actionpack/test/assertions/response_assertions_test.rb
+++ b/actionpack/test/assertions/response_assertions_test.rb
@@ -6,7 +6,12 @@ module ActionDispatch
     class ResponseAssertionsTest < ActiveSupport::TestCase
       include ResponseAssertions
 
-      FakeResponse = Struct.new(:response_code) do
+      FakeResponse = Struct.new(:response_code, :location) do
+        def initialize(*)
+          super
+          self.location ||= "http://test.example.com/posts"
+        end
+
         [:successful, :not_found, :redirection, :server_error].each do |sym|
           define_method("#{sym}?") do
             sym == response_code
@@ -14,6 +19,11 @@ module ActionDispatch
         end
       end
 
+      def setup
+        @controller = nil
+        @request = nil
+      end
+
       def test_assert_response_predicate_methods
         [:success, :missing, :redirect, :error].each do |sym|
           @response = FakeResponse.new RESPONSE_PREDICATES[sym].to_s.sub(/\?/, '').to_sym
@@ -58,6 +68,37 @@ module ActionDispatch
           assert_response :succezz
         }
       end
+
+      def test_error_message_shows_404_when_404_asserted_for_success
+        @response = ActionDispatch::Response.new
+        @response.status = 404
+
+        error = assert_raises(Minitest::Assertion) { assert_response :success }
+        expected = "Expected response to be a <success>, but was a <404>"
+        assert_match expected, error.message
+      end
+
+      def test_error_message_shows_302_redirect_when_302_asserted_for_success
+        @response = ActionDispatch::Response.new
+        @response.status = 302
+        @response.location = 'http://test.host/posts/redirect/1'
+
+        error = assert_raises(Minitest::Assertion) { assert_response :success }
+        expected = "Expected response to be a <success>, but was a <302>" \
+                   " redirect to <http://test.host/posts/redirect/1>"
+        assert_match expected, error.message
+      end
+
+      def test_error_message_shows_302_redirect_when_302_asserted_for_301
+        @response = ActionDispatch::Response.new
+        @response.status = 302
+        @response.location = 'http://test.host/posts/redirect/2'
+
+        error = assert_raises(Minitest::Assertion) { assert_response 301 }
+        expected = "Expected response to be a <301>, but was a <302>" \
+                   " redirect to <http://test.host/posts/redirect/2>"
+        assert_match expected, error.message
+      end
     end
   end
 end