Added test case for series expansion of polynomial/rational expression

[abhaydhiman]

References to other Issues or PRs

#12791

Brief description of what is fixed or changed

Added a test case for the series expansion of polynomial/rational expression in test_series.py

Other comments

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#12791 

#### Brief description of what is fixed or changed
Added a test case for the series expansion of polynomial/rational expression in test_series.py

#### Other comments


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[sachin-4099]

I think this can be real=True.

[sachin-4099]

I think this can be simply:
assert expr.series(beta, 0.5, 2) == sol (without round brackets).

[abhaydhiman]

Ok, I'll make the changes suggested by you.

[sachin-4099]

Moreover, don't simply add the testcase to the end of the file. Please find issue numbers closer to the issue number this PR resolves and add the testcase to that place.

[codecov]

Codecov Report

Merging #19974 into master will increase coverage by 0.016%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##            master    #19974       +/-   ##
=============================================
+ Coverage   75.814%   75.831%   +0.016%     
=============================================
  Files          669       669               
  Lines       173463    173463               
  Branches     40907     40907               
=============================================
+ Hits        131510    131539       +29     
+ Misses       36230     36202       -28     
+ Partials      5723      5722        -1     

[abhaydhiman]

So, can I add that in test_issue_12578 this function?

[sachin-4099]

So, can I add that in test_issue_12578 this function?

No, not inside that. But closer to that.

[abhaydhiman]

Just below that function. If I am not wrong.

[sachin-4099]

Just below that function. If I am not wrong.

Yeah should be fine.

[sachin-4099]

Looks good. This can be merged @jksuom.

[abhaydhiman]

Thanks! for the help @sachin-4099

[jksuom]

Thank you, this looks good.