docstr: Test if exception InvalidDataFormat is raised as expected.
docstr_tok: ["Test","if","exception","InvalidDataFormat","is","raised","as","expected","."]
code: def test_time_series_format(self):
      """
      Test if exception InvalidDataFormat is raised as expected.
      """
      self.assertRaises(
          exceptions.InvalidDataFormat, lambda: Correlator(list(), 1)
      )
  
imports: import os
  import sys
  import unittest
  from luminol import exceptions
  from luminol import Luminol
  from luminol.correlator import Correlator
label_desc: Use image node_id 9 for calling the TestCorrelator obj's underlying member method code with example usage: obj.test_time_series_format() without return types