code: def test_withnames(self):
      # Test the creation w/ format and names
      x = mrecarray(1, formats=float, names="base")
      x[0]["base"] = 10
      assert_equal(x["base"][0], 10)
  
imports: import pickle
  import numpy
  import numpy.ma
  from numpy.ma import masked, nomask
  from numpy.testing import temppath
  from numpy._core.records import recarray, fromrecords, fromarrays
  from numpy.ma.mrecords import MaskedRecords, mrecarray, fromarrays, fromtextfile, fromrecords, addfield
  from numpy.ma.testutils import assert_, assert_equal, assert_equal_records
label_desc: Use image node_id 14 for calling the TestMRecords obj's underlying member method code with example usage: obj.test_withnames() without return types