Regression test for limit issue

[dsaw]

References to other Issues or PRs

Fixes #8229

Brief description of what is fixed or changed

Added a regression test for limit issue.

Other comments

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#### References to other Issues or PRs
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Fixes #8229

#### Brief description of what is fixed or changed
Added a regression test for limit issue.

#### Other comments


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[sachin-4099]

There can be spaces around - and after , inside Rational.
So something like this:
limit((x**Rational(1, 4) - 2)/(sqrt(x) - 4)**Rational(2, 3), x, 16) == 0

[dsaw]

updated

[sachin-4099]

Moreover, don't add the testcase to the end of the file. Please find similar numbered issues and add the testcase around that place in the file.
Also please squash all these commits into a single commit.

[codecov]

Codecov Report

Merging #19922 into master will decrease coverage by 0.009%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##            master    #19922       +/-   ##
=============================================
- Coverage   75.811%   75.802%   -0.010%     
=============================================
  Files          668       668               
  Lines       173237    173237               
  Branches     40841     40841               
=============================================
- Hits        131334    131318       -16     
- Misses       36172     36184       +12     
- Partials      5731      5735        +4     

[sachin-4099]

Looks good to me. This can be merged @jksuom.

[jksuom]

Thank you, merging.