code: def test_default_dtype(
      *,
      input_dtype,
      as_native,
      backend_fw,
  ):
      with BackendHandler.update_backend(backend_fw) as ivy_backend:
          input_dtype = input_dtype[0]
          res = ivy_backend.default_dtype(
              dtype=input_dtype, as_native=as_native
          )
          assert isinstance(
              input_dtype,
              (ivy_backend.Dtype, str, ivy_backend.NativeDtype),
          )
          assert isinstance(res, ivy_backend.Dtype) or isinstance(
              input_dtype, str
          ), f"input_dtype={input_dtype!r}, but should be str or ivy.Dtype"
  
imports: import numpy
  from hypothesis import strategies
  import typing
  import ivy
  import ivy_tests.test_ivy.helpers
  from ivy_tests.test_ivy.helpers import handle_test, BackendHandler
label_desc: Use image node_id 16 for calling a global function with example usage: test_default_dtype() without return types