REF/TST: Collect Straggler Arithmetic Tests

[jbrockmendel]

After this AFAICT there are only 5 files left with possibly-misplaced arithmetic tests. Leaving those for another pass since some of them are testing type-specific behavior so will need a careful look.

Moved tests are unchanged except for contextifying pytest.raises where appropriate.

There's a hackathon in Feb I'm vaguely planning to use as a time to try to de-duplicate/parametrize the tests that have been moved to tests.arithmetic with TODO notes.

[pep8speaks]

Hello @jbrockmendel! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/tests/arithmetic/test_datetime64.py !

• There are no PEP8 issues in the file pandas/tests/arithmetic/test_numeric.py !

• There are no PEP8 issues in the file pandas/tests/arithmetic/test_period.py !

• There are no PEP8 issues in the file pandas/tests/arithmetic/test_timedelta64.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_arithmetic.py !

• There are no PEP8 issues in the file pandas/tests/indexes/period/test_ops.py !

• There are no PEP8 issues in the file pandas/tests/indexes/test_base.py !

• There are no PEP8 issues in the file pandas/tests/indexes/test_range.py !

• There are no PEP8 issues in the file pandas/tests/indexes/timedeltas/test_arithmetic.py !

[codecov]

Codecov Report

Merging #24376 into master will decrease coverage by 49.31%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #24376       +/-   ##
===========================================
- Coverage   92.29%   42.98%   -49.32%     
===========================================
  Files         162      162               
  Lines       51841    51841               
===========================================
- Hits        47847    22282    -25565     
- Misses       3994    29559    +25565

Flag	Coverage Δ
#multiple	?
#single	42.98% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/io/formats/latex.py	0% <0%> (-100%)	⬇️
pandas/core/categorical.py	0% <0%> (-100%)	⬇️
pandas/io/sas/sas_constants.py	0% <0%> (-100%)	⬇️
pandas/tseries/plotting.py	0% <0%> (-100%)	⬇️
pandas/tseries/converter.py	0% <0%> (-100%)	⬇️
pandas/io/formats/html.py	0% <0%> (-98.65%)	⬇️
pandas/core/groupby/categorical.py	0% <0%> (-95.46%)	⬇️
pandas/io/sas/sas7bdat.py	0% <0%> (-91.17%)	⬇️
pandas/io/sas/sas_xport.py	0% <0%> (-90.15%)	⬇️
pandas/core/tools/numeric.py	10.44% <0%> (-89.56%)	⬇️
... and 120 more

---

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[codecov]

Codecov Report

Merging #24376 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #24376   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files         162      162           
  Lines       51841    51841           
=======================================
  Hits        47847    47847           
  Misses       3994     3994

Flag	Coverage Δ
#multiple	90.7% <ø> (ø)	⬆️
#single	42.98% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5d134ec...38e7f1f. Read the comment docs.

[jreback]

thanks!