TST: isort tests/test_*

[simonjayhawkins]

xref #23334

[jreback]

lgtm. keep in mind that depending on merge ordering these may need rebasing.

[jreback]

lint error

[codecov]

Codecov Report

Merging #24551 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #24551      +/-   ##
==========================================
- Coverage   92.33%   92.33%   -0.01%     
==========================================
  Files         166      166              
  Lines       52465    52465              
==========================================
- Hits        48443    48442       -1     
- Misses       4022     4023       +1

Flag	Coverage Δ
#multiple	90.75% <ø> (ø)	⬆️
#single	43% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/util/testing.py	87.59% <0%> (-0.1%)	⬇️

---

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[codecov]

Codecov Report

Merging #24551 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #24551      +/-   ##
==========================================
- Coverage   92.33%   92.33%   -0.01%     
==========================================
  Files         166      166              
  Lines       52465    52465              
==========================================
- Hits        48443    48442       -1     
- Misses       4022     4023       +1

Flag	Coverage Δ
#multiple	90.75% <ø> (ø)	⬆️
#single	43% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/util/testing.py	87.59% <0%> (-0.1%)	⬇️

---

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 3ad0cfc...aa4474b. Read the comment docs.

[jreback]

thanks!