code: def testAllSpans_OnEmpty_ReturnsEmpty(self):
      actual = self._all_spans([])
      self.assertEqual(actual, [])
  
file_path: tfx/tfx/dsl/input_resolution/ops/all_spans_op_test.py
imports: import tensorflow
  from tfx.dsl.input_resolution.ops import ops
  from tfx.dsl.input_resolution.ops import test_utils
label_desc: Use image node_id 2 for calling the AllSpansOpTest obj's underlying member method code with example usage: obj.testAllSpans_OnEmpty_ReturnsEmpty() without return types