code: def test_vwma(self):
      result = pandas_ta.vwma(self.close, self.volume)
      self.assertIsInstance(result, Series)
      self.assertEqual(result.name, "VWMA_10")
  
imports: from .config import CORRELATION, CORRELATION_THRESHOLD, error_analysis, sample_data, VERBOSE
  from .context import pandas_ta
  from unittest import TestCase
  import pandas.testing
  from pandas import DataFrame, Series
  import talib
label_desc: Use image node_id 39 for calling the TestOverlap obj's underlying member method code with example usage: obj.test_vwma() without return types