code: def test_invalid_unit(self):
      with self.assertRaisesWithPredicateMatch(
          ValueError, "Unit should be"
      ):
          splits.ReadInstruction("test", unit="kg", rounding="closest")
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import proto
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core.utils import shard_utils
  import tensorflow_datasets.public_api
label_desc: Use image node_id 8 for calling the ReadInstructionTest obj's underlying member method code with example usage: obj.test_invalid_unit() without return types