class_docstr: Test polynomial creation with symbol kwarg.
code: def test_default_symbol(self):
      p = poly.Polynomial(self.c)
      assert_equal(p.symbol, "x")
  
imports: import pytest
  import numpy.polynomial
  from numpy._core import array
  from numpy.testing import assert_equal, assert_raises, assert_
label_desc: Use image node_id 1 for calling the TestInit obj's underlying member method code with example usage: obj.test_default_symbol() without return types