[test] add test/tutorial for TFractionFitter

[ferdymercury]

This Pull request:

Changes or fixes:

Fixes https://its.cern.ch/jira/browse/ROOT-9330

This would be also a good excuse to revive #18090

Checklist:

• tested changes locally
• updated the docs (if necessary)

[github-actions]

Test Results

    21 files      21 suites   3d 7h 36m 57s ⏱️
 3 222 tests  3 220 ✅ 0 💤 2 ❌
65 943 runs  65 941 ✅ 0 💤 2 ❌

For more details on these failures, see this check.

Results for commit 14359e2.

♻️ This comment has been updated with latest results.

[dpiparo]

This PR is really good, thanks for proposing these changes. Maybe, and this is up to @martamaja10 also to say, the tutorial seems a bit old fashioned, with all the pointers, new and deletes and could use a slight modernisation...

[martamaja10]

This PR is really good, thanks for proposing these changes. Maybe, and this is up to @martamaja10 also to say, the tutorial seems a bit old fashioned, with all the pointers, new and deletes and could use a slight modernisation...

Hi @ferdymercury,

Thanks a lot for this nice PR! I agree with Danilo, maybe some "modernisation" would be nice, so what it really involves is, for example changing lines like: TF1 *f0 = new TF1("f0", "[0]*(1-cos(x))/TMath::Pi()", 0., TMath::Pi()); to TF1 f0("f0", "[0]*(1-cos(x))/TMath::Pi()", 0., TMath::Pi()); and then we don't need the deletes either.

Cheers,
Marta

[martamaja10]

Another thing that would be super super nice to add to this PR is an entry in the fit tutorials table which is defined in this file: https://github.com/root-project/root/blob/master/tutorials/math/fit/index.md. Thanks!

[martamaja10]

Thank you for implementing my previous comments. Would it be possible to also squash the commits (we could have one for adding the new tutorial and one for adding the tests) and run a git clang-format at the end (I can see that the CI is complaining about the formatting: https://github.com/root-project/root/actions/runs/16625830587/job/47041863011?pr=19243)

[martamaja10]

Thank you for this nice PR!

[martamaja10]

Hi again @ferdymercury, sorry for being picky, one very very last thing before merging, the clang-format still complains. The two new files after clang-formatting should look like the ones under this link: https://cernbox.cern.ch/s/RzAxbAJbAVb60Io

[ferdymercury]

the clang-format still complains.

My bad, I totally forgot that step :)

Fixed now.