code: def test_validate_invalid_job_label(self):
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # must start with lower case
          gcp.validate_job_labels(
              job_labels={"": ""},
          )
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # must start with lower case
          gcp.validate_job_labels(job_labels={"test": "-label"})
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # must start with lower case
          gcp.validate_job_labels(job_labels={"Test": "label"})
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # no upper case
          gcp.validate_job_labels(job_labels={"test": "labelA"})
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # no symbol
          gcp.validate_job_labels(job_labels={"test": "label@"})
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # label cannot be too long
          gcp.validate_job_labels(job_labels={"test": "a" * 64})
  
      with self.assertRaisesRegex(ValueError, r"Invalid job labels"):
          # label cannot be too many
          gcp.validate_job_labels(
              job_labels={
                  "key{}".format(i): "val{}".format(i)
                  for i in range(65)
              }
          )
  
file_path: cloud/src/python/tensorflow_cloud/core/tests/unit/gcp_test.py
imports: from absl.testing import absltest
  from tensorflow_cloud.core import gcp
  from tensorflow_cloud.core import machine_config
label_desc: Use image node_id 6 for calling the TestGcp obj's underlying member method code with example usage: obj.test_validate_invalid_job_label() without return types