code: def test_min_periods_count(series, step):
      result = series.rolling(
          len(series) + 1, min_periods=0, step=step
      ).count()
      expected = series.rolling(
          len(series), min_periods=0, step=step
      ).count()
      nan_mask = isna(result)
      tm.assert_series_equal(nan_mask, isna(expected))
  
      nan_mask = ~nan_mask
      tm.assert_almost_equal(result[nan_mask], expected[nan_mask])
  
imports: from datetime import datetime
  import numpy
  import pytest
  import pandas.util._test_decorators
  from pandas import DataFrame, DatetimeIndex, Series, concat, isna, notna
  import pandas._testing
  from pandas.tseries import offsets
label_desc: Use image node_id 8 for calling a global function with example usage: test_min_periods_count(series, step) without return types