Improve the error message for assert_redirected_to (closes #7337) [sandofsky]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7578 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/assertions/response_assertions.rb

@@ -78,9 +78,8 @@ def assert_redirected_to(options = {}, message=nil)
               url[key] = value
             end
 
-            @response_diff = url[:expected].diff(url[:actual]) if url[:actual]
-            msg = build_message(message, "response is not a redirection to all of the options supplied (redirection is <?>), difference: <?>",
-                                url[:actual], @response_diff)
+            @response_diff = url[:actual].diff(url[:expected]) if url[:actual]
+            msg = build_message(message, "expected a redirect to <?>, found one to <?>, a difference of <?> ", url[:expected], url[:actual], @response_diff)
 
             assert_block(msg) do
               url[:expected].keys.all? do |k|

actionpack/test/template/url_helper_test.rb

@@ -108,6 +108,16 @@ def test_link_tag_with_query
   def test_link_tag_with_query_and_no_name
     assert_dom_equal "<a href=\"http://www.example.com?q1=v1&amp;q2=v2\">http://www.example.com?q1=v1&amp;q2=v2</a>", link_to(nil, "http://www.example.com?q1=v1&amp;q2=v2")
   end
+  
+  def test_link_tag_with_back
+    @controller.request = RequestMock.new("http://www.example.com/weblog/show", nil, nil, {'HTTP_REFERER' => 'http://www.example.com/referer'})
+    assert_dom_equal "<a href=\"http://www.example.com/referer\">go back</a>", link_to('go back', :back)
+  end
+  
+  def test_link_tag_with_back_and_no_referer
+    @controller.request = RequestMock.new("http://www.example.com/weblog/show", nil, nil, {})
+    assert_dom_equal "<a href=\"javascript:history.back()\">go back</a>", link_to('go back', :back)
+  end
 
   def test_link_tag_with_img
     assert_dom_equal "<a href=\"http://www.example.com\"><img src='/favicon.jpg' /></a>", link_to("<img src='/favicon.jpg' />", "http://www.example.com")