Split large test modules

[simonjayhawkins]

• pandas/tests/tseries/offsets/test_offsets.py TST: Split test_offsets.py #27085

• pandas/tests/test_resample.py TST/MAINT: split up test_resample.py to make it more understandable #17806 (has now been split, some post split cleanup required)

• pandas/tests/io/test_pytables.py TST: split out test_pytables.py to sub-module of tests #18498

• pandas/tests/test_window.py TST: split tests for windows to sub-modules #19228

• pandas/tests/test_base.py CLN: fixturize & split test_base #23877

• pandas/tests/frame/test_indexing.py TST: split up tests/frame/test_indexing.py #25798

PRs welcome!

[moink]

I will take
pandas/tests/tseries/offsets/test_offsets.py

[moink]

Also @jreback requested pandas/tests/io/pytables/test_store.py in a comment on #38609

[moink]

pandas/tests/tseries/offsets/test_offsets.py is done

[moink]

The list in the issue text seems to be outdated. Here are the lengths and names of all test modules with more than 1000 lines:

5030 pandas/tests/io/pytables/test_store.py
3672 pandas/tests/test_strings.py
3316 pandas/tests/io/formats/test_format.py
3047 pandas/tests/io/test_sql.py
2522 pandas/tests/arithmetic/test_datetime64.py
2476 pandas/tests/tools/test_to_datetime.py
2414 pandas/tests/frame/test_constructors.py
2411 pandas/tests/test_algos.py
2389 pandas/tests/reshape/merge/test_merge.py
2367 pandas/tests/indexes/test_base.py
2280 pandas/tests/plotting/frame/test_frame.py
2208 pandas/tests/arithmetic/test_timedelta64.py
2203 pandas/tests/groupby/test_groupby.py
2188 pandas/tests/reshape/test_pivot.py
2141 pandas/tests/indexing/test_loc.py
2059 pandas/tests/computation/test_eval.py
1999 pandas/tests/io/test_stata.py
1933 pandas/tests/frame/test_stack_unstack.py
1908 pandas/tests/io/formats/test_style.py
1805 pandas/tests/resample/test_datetime_index.py
1756 pandas/tests/frame/indexing/test_indexing.py
1740 pandas/tests/io/json/test_pandas.py
1735 pandas/tests/frame/test_arithmetic.py
1700 pandas/tests/groupby/test_categorical.py
1666 pandas/tests/series/test_constructors.py
1638 pandas/tests/frame/methods/test_replace.py
1606 pandas/tests/io/parser/test_parse_dates.py
1578 pandas/tests/scalar/period/test_period.py
1576 pandas/tests/frame/apply/test_frame_apply.py
1536 pandas/tests/arithmetic/test_period.py
1517 pandas/tests/dtypes/test_inference.py
1516 pandas/tests/plotting/test_datetimelike.py
1494 pandas/tests/frame/test_reductions.py
1465 pandas/tests/tseries/offsets/test_yqm_offsets.py
1457 pandas/tests/io/formats/test_to_latex.py
1424 pandas/tests/reductions/test_reductions.py
1384 pandas/tests/io/excel/test_writers.py
1381 pandas/tests/arithmetic/test_numeric.py
1375 pandas/tests/reshape/merge/test_merge_asof.py
1359 pandas/tests/io/excel/test_readers.py
1340 pandas/tests/frame/methods/test_to_csv.py
1308 pandas/tests/arrays/sparse/test_array.py
1258 pandas/tests/io/test_html.py
1245 pandas/tests/frame/test_query_eval.py
1236 pandas/tests/arrays/test_datetimelike.py
1200 pandas/tests/io/json/test_ujson.py
1192 pandas/tests/groupby/transform/test_transform.py
1191 pandas/tests/indexes/datetimes/test_timezones.py
1179 pandas/tests/internals/test_internals.py
1177 pandas/tests/groupby/aggregate/test_aggregate.py
1149 pandas/tests/indexes/datetimes/test_constructors.py
1147 pandas/tests/indexing/test_coercion.py
1132 pandas/tests/window/test_rolling.py
1125 pandas/tests/indexing/test_indexing.py
1123 pandas/tests/groupby/test_function.py
1111 pandas/tests/groupby/test_apply.py
1099 pandas/tests/indexing/test_iloc.py
1085 pandas/tests/test_nanops.py
1071 pandas/tests/reshape/test_melt.py
1061 pandas/tests/io/test_parquet.py
1042 pandas/tests/dtypes/test_dtypes.py
1031 pandas/tests/scalar/timedelta/test_arithmetic.py
1016 pandas/tests/indexes/datetimes/test_date_range.py

[moink]

I will take
pandas/tests/io/pytables/test_store.py

[moink]

Done:
pandas/tests/io/pytables/test_store.py
I will take:
pandas/tests/test_strings.py