code: def test_get_zero_changepoints(self, daily_univariate_ts, backend):
      train, _ = train_test_split(
          daily_univariate_ts, daily_univariate_ts.shape[0] // 2
      )
      m = Prophet(n_changepoints=0, stan_backend=backend)
      history = m.setup_dataframe(train, initialize_scales=True)
      m.history = history
      m.set_changepoints()
      cp = m.changepoints_t
      assert cp.shape[0] == 1
      assert cp[0] == 0
  
imports: import numpy
  import pandas
  import pytest
  from prophet import Prophet
  from prophet.utilities import warm_start_params
label_desc: Use image node_id 10 for calling the TestProphetTrendComponent obj's underlying member method code with example usage: obj.test_get_zero_changepoints(daily_univariate_ts, backend) without return types