BF: Skip test_read_excel_parse_dates if no xlwt which is used in to_excel

[yarikoptic]

No description provided.

[codecov]

Codecov Report

Merging #19803 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #19803      +/-   ##
==========================================
- Coverage   91.61%    91.6%   -0.01%     
==========================================
  Files         150      150              
  Lines       48887    48887              
==========================================
- Hits        44786    44784       -2     
- Misses       4101     4103       +2

Flag	Coverage Δ
#multiple	89.98% <ø> (-0.01%)	⬇️
#single	41.8% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/util/testing.py	83.64% <0%> (-0.21%)	⬇️

---

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 740ad9a...dd910d5. Read the comment docs.

[WillAyd]

FWIW the _skip_if_no_* methods in test_excel.py could all be replaced with the skip_if_no decorator that was introduced in #18765

import pandas.util._test_decorators as td

@td.skip_if_no('xlwt')
def foo(self):
  ...

@td.skip_if_no('xlrd', min_version='0.9')
def bar(self):
  ...

[jreback]

thanks @yarikoptic

@WillAyd yep good suggestion. can you open an issue (and PR even better!) for this.