class_docstr: Test the decimals keyword argument.
docstr: Test that when decimals is ``None``, parameters are omitted.
docstr_tok: ["Test","that","when","decimals","is","``","None","``",",","parameters","are","omitted","."]
code: def test_decimals_None(self):
      """Test that when decimals is ``None``, parameters are omitted."""
  
      expected = (
          "    0: ──RX─┤  <Z>\n    a: ──RY─┤     \n1.234: ──RZ─┤     "
      )
      assert (
          draw(circuit, decimals=None)(1.234, 2.345, 3.456) == expected
      )
  
imports: from functools import partial
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.drawer import draw
label_desc: Use image node_id 1 for calling the TestDecimals obj's underlying member method code with example usage: obj.test_decimals_None() without return types