code: def test_simple():
      assert list(x.lseries()) == [x]
      assert list(S.One.lseries(x)) == [1]
      assert not next((x / (x + y)).lseries(y)).has(Order)
  
file_path: sympy/sympy/series/tests/test_lseries.py
imports: from sympy.core.numbers import E
  from sympy.core.singleton import S
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.hyperbolic import tanh
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.series.order import Order
  from sympy.abc import x, y
label_desc: Use image node_id 5 for calling a global function with example usage: test_simple() without return types