docstr: Test validate missing names
docstr_tok: ["Test","validate","missing","names"]
code: def test_missing_names(self):
      "Test validate missing names"
      namelist = ("a", "b", "c")
      validator = NameValidator()
      assert_equal(validator(namelist), ["a", "b", "c"])
      namelist = ("", "b", "c")
      assert_equal(validator(namelist), ["f0", "b", "c"])
      namelist = ("a", "b", "")
      assert_equal(validator(namelist), ["a", "b", "f0"])
      namelist = ("", "f0", "")
      assert_equal(validator(namelist), ["f1", "f0", "f2"])
  
imports: import time
  from datetime import date
  import numpy
  from numpy.testing import assert_, assert_equal, assert_allclose, assert_raises
  from numpy.lib._iotools import LineSplitter, NameValidator, StringConverter, has_nested_fields, easy_dtype, flatten_dtype
label_desc: Use image node_id 3 for calling the TestNameValidator obj's underlying member method code with example usage: obj.test_missing_names() without return types