Allow use of assert_template with the :file option.

This worked in Rails 3.2, but was a regression in 4.0.0.beta1

actionpack/CHANGELOG.md

@@ -16,6 +16,12 @@
 
     *Yves Senn*
 
+*   Fixed regression when using `assert_template` to verify files sent using
+    `render file: 'README.md'`.
+    Fixes #9464.
+
+    *Justin Coyne*
+
 *   Skip valid encoding checks for non-String parameters that come
     from the matched route's defaults.
     Fixes #9435.

actionpack/lib/action_controller/test_case.rb

@@ -16,6 +16,7 @@ def setup_subscriptions
       @_partials = Hash.new(0)
       @_templates = Hash.new(0)
       @_layouts = Hash.new(0)
+      @_files = Hash.new(0)
 
       ActiveSupport::Notifications.subscribe("render_template.action_view") do |name, start, finish, id, payload|
         path = payload[:layout]
@@ -39,6 +40,16 @@ def setup_subscriptions
 
         @_templates[path] += 1
       end
+
+      ActiveSupport::Notifications.subscribe("!render_template.action_view") do |name, start, finish, id, payload|
+        path = payload[:identifier]
+        next if payload[:virtual_path] # files don't have virtual path
+        if path
+          @_files[path] += 1
+          @_files[path.split("/").last] += 1
+        end
+
+      end
     end
 
     def teardown_subscriptions
@@ -106,7 +117,7 @@ def assert_template(options = {}, message = nil)
           end
         assert matches_template, msg
       when Hash
-        options.assert_valid_keys(:layout, :partial, :locals, :count)
+        options.assert_valid_keys(:layout, :partial, :locals, :count, :file)
 
         if options.key?(:layout)
           expected_layout = options[:layout]
@@ -123,6 +134,10 @@ def assert_template(options = {}, message = nil)
           end
         end
 
+        if options[:file]
+          assert_includes @_files.keys, options[:file]
+        end
+
         if expected_partial = options[:partial]
           if expected_locals = options[:locals]
             if defined?(@_rendered_views)

actionpack/lib/action_view/template.rb

@@ -138,7 +138,7 @@ def supports_streaming?
     # we use a bang in this instrumentation because you don't want to
     # consume this in production. This is only slow if it's being listened to.
     def render(view, locals, buffer=nil, &block)
-      ActiveSupport::Notifications.instrument("!render_template.action_view", :virtual_path => @virtual_path) do
+      ActiveSupport::Notifications.instrument("!render_template.action_view", :virtual_path => @virtual_path, :identifier=>@identifier) do
         compile!(view)
         view.send(method_name, locals, buffer, &block)
       end

actionpack/lib/action_view/test_case.rb

@@ -219,6 +219,7 @@ def view
         :@_routes,
         :@controller,
         :@_layouts,
+        :@_files,
         :@_rendered_views,
         :@method_name,
         :@output_buffer,

actionpack/test/controller/action_pack_assertions_test.rb

@@ -96,6 +96,14 @@ def raise_exception_on_post
     raise "post" if request.post?
     render :text => "request method: #{request.env['REQUEST_METHOD']}"
   end
+
+  def render_file_absolute_path
+    render :file => File.expand_path('../../../README.rdoc', __FILE__)
+  end
+
+  def render_file_relative_path
+    render :file => 'README.rdoc'
+  end
 end
 
 # Used to test that assert_response includes the exception message
@@ -142,6 +150,16 @@ def test_assert_tag_and_url_for
     assert_tag :content => "/action_pack_assertions/flash_me"
   end
 
+  def test_render_file_absolute_path
+    get :render_file_absolute_path
+    assert_match /\A= Action Pack/, @response.body
+  end
+
+  def test_render_file_relative_path
+    get :render_file_relative_path
+    assert_match /\A= Action Pack/, @response.body
+  end
+
   def test_get_request
     assert_raise(RuntimeError) { get :raise_exception_on_get }
     get :raise_exception_on_post
@@ -441,6 +459,23 @@ def test_with_partial
     assert_template :partial => '_partial'
   end
 
+  def test_file_with_absolute_path_success
+    get :render_file_absolute_path
+    assert_template :file => File.expand_path('../../../README.rdoc', __FILE__)
+  end
+
+  def test_file_with_relative_path_success
+    get :render_file_relative_path
+    assert_template :file => 'README.rdoc'
+  end
+
+  def test_with_file_failure
+    get :render_file_absolute_path
+    assert_raise(ActiveSupport::TestCase::Assertion) do
+      assert_template :file => 'test/hello_world'
+    end
+  end
+
   def test_with_nil_passes_when_no_template_rendered
     get :nothing
     assert_template nil