Add a test for definining response_body method for Files

1 files changed, 8 insertions, 0 deletions

diff --git a/test/spec_files.rb b/test/spec_files.rb
index 877e024a..898b0d90 100644
--- a/test/spec_files.rb
+++ b/test/spec_files.rb
@@ -23,6 +23,14 @@ describe Rack::Files do
     assert_equal 200, status
   end
 
+  it 'raises if you attempt to define response_body in subclass' do
+    c = Class.new(Rack::Files)
+
+    lambda do
+      c.send(:define_method, :response_body){}
+    end.must_raise RuntimeError
+  end
+
   it 'serves files with + in the file name' do
     Dir.mktmpdir do |dir|
       File.write File.join(dir, "you+me.txt"), "hello world"