code: def test_apply_to_single_assignments_static_unpack(self):
      node = parser.parse("a, b, c = d, e, f")
      ast_util.apply_to_single_assignments(
          node.targets, node.value, self._mock_apply_fn
      )
      self.assertDictEqual(
          self._invocation_counts,
          {
              ("a", "d"): 1,
              ("b", "e"): 1,
              ("c", "f"): 1,
          },
      )
  
imports: import ast
  import collections
  import textwrap
  import gast
  from tensorflow.python.autograph.pyct import anno
  from tensorflow.python.autograph.pyct import ast_util
  from tensorflow.python.autograph.pyct import loader
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import pretty_printer
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.platform import test
label_desc: Use image node_id 18 for calling the AstUtilTest obj's underlying member method code with example usage: obj.test_apply_to_single_assignments_static_unpack() without return types