Tests: Ruby module.

test/ruby/input_read_buffer_not_empty/config.ru

@@ -0,0 +1,9 @@
+app = Proc.new do |env|
+    body = 'blah'
+    env['rack.input'].read(nil, body)
+    ['200', {
+        'Content-Length' => body.length.to_s
+    }, [body]]
+end
+
+run app