docstr: Test if drawing bounding box on a GRY image works.
docstr_tok: ["Test","if","drawing","bounding","box","on","a","GRY","image","works","."]
code: def testDrawBoundingBoxGRY(self):
      """Test if drawing bounding box on a GRY image works."""
      image = np.zeros([4, 4, 1], "float32")
      self._testDrawBoundingBoxColorCycling(image)
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import image_ops
  from tensorflow.python.ops import image_ops_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the DrawBoundingBoxOpTest obj's underlying member method code with example usage: obj.testDrawBoundingBoxGRY() without return types