class_docstr: Test that all type conversions are working.
class_docstr_tok: ["Test","that","all","type","conversions","are","working","."]
code: def testFloatNan(self):
      try:
          float("nan")
      except ValueError:
          return self.skipTest("nan not available on this platform")
  
      s = self.execute("SELECT %s AS foo", (float("nan"),))
      self.failUnless(str(s) == "nan", "wrong float quoting: " + str(s))
      self.failUnless(
          type(s) == float, "wrong float conversion: " + repr(s)
      )
  
imports: import string
  import ctypes
  import decimal
  import datetime
  import platform
  from .None import testutils
  import unittest
  from .testutils import ConnectingTestCase, restore_types
  from .testutils import skip_if_crdb
  import psycopg2
  from psycopg2.extensions import AsIs, adapt, register_adapter
label_desc: Use image node_id 7 for calling the TypesBasicTests obj's underlying member method code with example usage: obj.testFloatNan() and returns: self