code: def test_detect(self):
      with open(CSV_FILE, "r") as fp:
          stream = fp.read()
          assert_true(formats.DelimitedFormat.detect(stream))
      with open(JSON_FILE, "r") as fp:
          stream = fp.read()
          assert_false(formats.DelimitedFormat.detect(stream))
  
imports: import os
  import unittest
  from nose.tools import *
  from textblob import formats
  from textblob.compat import unicode
label_desc: Use image node_id 2 for calling the TestDelimitedFormat obj's underlying member method code with example usage: obj.test_detect() without return types