REF/TST: Add more pytest idiom to tests/resample (#24230)

Author: simonjayhawkins

pandas/tests/resample/conftest.py

@@ -1,7 +1,18 @@
+from datetime import datetime
+
+import numpy as np
 import pytest
 
-from pandas.tests.resample.test_base import (
-    downsample_methods, resample_methods, upsample_methods)
+from pandas import DataFrame, Series
+from pandas.core.indexes.datetimes import date_range
+from pandas.core.indexes.period import period_range
+
+# The various methods we support
+downsample_methods = ['min', 'max', 'first', 'last', 'sum', 'mean', 'sem',
+                      'median', 'prod', 'var', 'std', 'ohlc', 'quantile']
+upsample_methods = ['count', 'size']
+series_methods = ['nunique']
+resample_methods = downsample_methods + upsample_methods + series_methods
 
 
 @pytest.fixture(params=downsample_methods)
@@ -20,3 +31,68 @@ def upsample_method(request):
 def resample_method(request):
     """Fixture for parametrization of Grouper resample methods."""
     return request.param
+
+
+@pytest.fixture
+def simple_date_range_series():
+    """
+    Series with date range index and random data for test purposes.
+    """
+    def _simple_date_range_series(start, end, freq='D'):
+        rng = date_range(start, end, freq=freq)
+        return Series(np.random.randn(len(rng)), index=rng)
+    return _simple_date_range_series
+
+
+@pytest.fixture
+def simple_period_range_series():
+    """
+    Series with period range index and random data for test purposes.
+    """
+    def _simple_period_range_series(start, end, freq='D'):
+        rng = period_range(start, end, freq=freq)
+        return Series(np.random.randn(len(rng)), index=rng)
+    return _simple_period_range_series
+
+
+@pytest.fixture
+def _index_start():
+    return datetime(2005, 1, 1)
+
+
+@pytest.fixture
+def _index_end():
+    return datetime(2005, 1, 10)
+
+
+@pytest.fixture
+def _index_freq():
+    return 'D'
+
+
+@pytest.fixture
+def index(_index_factory, _index_start, _index_end, _index_freq):
+    return _index_factory(_index_start, _index_end, freq=_index_freq)
+
+
+@pytest.fixture
+def _static_values(index):
+    return np.arange(len(index))
+
+
+@pytest.fixture
+def series(index, _series_name, _static_values):
+    return Series(_static_values, index=index, name=_series_name)
+
+
+@pytest.fixture
+def frame(index, _static_values):
+    return DataFrame({'value': _static_values}, index=index)
+
+
+@pytest.fixture(params=[Series, DataFrame])
+def series_and_frame(request, series, frame):
+    if request.param == Series:
+        return series
+    if request.param == DataFrame:
+        return frame