code: def testOutOfRangeError_VectorScalar(self, dtype, pos, unit):
      # Vector/Scalar
      test_string = {
          "BYTE": [b"good", b"good", b"bad", b"good"],
          "UTF8_CHAR": [
              x.encode("utf-8")
              for x in ["g\xc3\xc3d", "b\xc3d", "g\xc3\xc3d"]
          ],
      }[unit]
      position = np.array(pos, dtype)
      length = np.array(1, dtype)
      substr_op = string_ops.substr(
          test_string, position, length, unit=unit
      )
      with self.cached_session():
          with self.assertRaises(errors_impl.InvalidArgumentError):
              self.evaluate(substr_op)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import string_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 9 for calling the SubstrOpTest obj's underlying member method code with example usage: obj.testOutOfRangeError_VectorScalar(dtype, pos, unit) without return types