2 files changed, 41 insertions, 0 deletions
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 1214d608a4..4820f00aa1 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -93,6 +93,7 @@ end
 class ActionController::IntegrationTest < ActiveSupport::TestCase
   def self.build_app(routes = nil)
     ActionDispatch::MiddlewareStack.new { |middleware|
+      middleware.use "ActionDispatch::StringCoercion"
       middleware.use "ActionDispatch::ShowExceptions"
       middleware.use "ActionDispatch::Callbacks"
       middleware.use "ActionDispatch::ParamsParser"
diff --git a/actionpack/test/dispatch/string_coercion_test.rb b/actionpack/test/dispatch/string_coercion_test.rb
new file mode 100644
index 0000000000..d79b17b932
--- /dev/null
+++ b/actionpack/test/dispatch/string_coercion_test.rb
@@ -0,0 +1,40 @@
+require 'abstract_unit'
+
+class StringCoercionTest < ActiveSupport::TestCase
+  test "body responds to each" do
+    original_body = []
+    body = ActionDispatch::StringCoercion::UglyBody.new(original_body)
+
+    assert original_body.respond_to?(:each)
+    assert body.respond_to?(:each)
+  end
+
+  test "body responds to to_path" do
+    original_body = []
+    def original_body.to_path; end
+    body = ActionDispatch::StringCoercion::UglyBody.new(original_body)
+
+    assert original_body.respond_to?(:to_path)
+    assert body.respond_to?(:to_path)
+  end
+
+  test "body does not responds to to_path" do
+    original_body = []
+    body = ActionDispatch::StringCoercion::UglyBody.new(original_body)
+
+    assert !original_body.respond_to?(:to_path)
+    assert !body.respond_to?(:to_path)
+  end
+
+  test "calls to_s on body parts" do
+    app = lambda { |env|
+      [200, {'Content-Type' => 'html'}, [1, 2, 3]]
+    }
+    app = ActionDispatch::StringCoercion.new(app)
+    parts = []
+    status, headers, body = app.call({})
+    body.each { |part| parts << part }
+
+    assert_equal %w( 1 2 3 ), parts
+  end
+end