code: def test_validate_hex_color(self):
      # Valid colors
      fou.validate_hex_color("#FF6D04")
      fou.validate_hex_color("#ff6d04")
      fou.validate_hex_color("#000")
      fou.validate_hex_color("#eee")
  
      # Invalid colors
      with self.assertRaises(ValueError):
          fou.validate_hex_color("aaaaaa")
  
      with self.assertRaises(ValueError):
          fou.validate_hex_color("#bcedfg")
  
      with self.assertRaises(ValueError):
          fou.validate_hex_color("#ggg")
  
      with self.assertRaises(ValueError):
          fou.validate_hex_color("#FFFF")
  
imports: import time
  import unittest
  from unittest.mock import MagicMock, patch
  import numpy
  import fiftyone
  import fiftyone.constants
  import fiftyone.core.media
  import fiftyone.core.odm
  import fiftyone.core.utils
  from fiftyone.migrations.runner import MigrationRunner
  from decorators import drop_datasets
  from bson import ObjectId
  from fiftyone.core.odm.utils import load_dataset
label_desc: Use image node_id 1 for calling the CoreUtilsTests obj's underlying member method code with example usage: obj.test_validate_hex_color() without return types