code: def test_merge_dicts(self):
      a = {"a": 1, "b": 2}
      b = {"a": 1, "c": 3}
      c = {}
      d = {"a": 2, "b": 2}
      assert merge_dicts([a, b]) == {"a": 1, "b": 2, "c": 3}
      assert merge_dicts([a, c]) == a
      assert merge_dicts([a, b, c]) == {"a": 1, "b": 2, "c": 3}
      with self.assertRaises(AssertionError):
          merge_dicts([a, d])
  
imports: import unittest
  from PIL import Image
  from tinygrad.helpers import Context, ContextVar, merge_dicts, strip_parens, prod, round_up, fetch, fully_flatten, from_mv, to_mv
  from tinygrad.shape.symbolic import Variable, NumNode
label_desc: Use image node_id 1 for calling the TestMergeDicts obj's underlying member method code with example usage: obj.test_merge_dicts() without return types