code: def test_no_true(self):
      primitive_func = self.primitive().get_function()
      times = pd.Series(
          [datetime(2011, 4, 9, 10, 30, i * 6) for i in range(5)]
      )
      booleans = pd.Series([False] * 5)
      assert isnan(
          primitive_func(times, booleans, time=self.cutoff_time)
      )
  
imports: from datetime import datetime
  from math import isnan
  import numpy
  import pandas
  from featuretools.primitives import TimeSinceLastFalse, TimeSinceLastMax, TimeSinceLastMin, TimeSinceLastTrue
label_desc: Use image node_id 2 for calling the TestTimeSinceLastTrue obj's underlying member method code with example usage: obj.test_no_true() without return types