Reset derived quantity objects data and t at the beginning of a simulation

[Allentro]

Proposed changes

I have implemented a fix to reset export.t and export.data at the beginning of a simulation, accompanied by a respective test. This PR resolves #728

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

• Black formatted
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (db4ad6f) to head (e26c4f3).
Report is 4 commits behind head on fenicsx.

Additional details and impacted files

@@           Coverage Diff            @@
##           fenicsx     #733   +/-   ##
========================================
  Coverage    97.76%   97.76%           
========================================
  Files           44       44           
  Lines         2099     2102    +3     
========================================
+ Hits          2052     2055    +3     
  Misses          47       47           

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[RemDelaporteMathurin]

Initial round of comments, the fix obviously works fine, but it's not the right place for it.

[RemDelaporteMathurin]

Can you parametrise this test to also check for other derived quantities (eg. TotalVolume)

[RemDelaporteMathurin]

Hey @Allentro what is the status of this?

[Allentro]

Hey @Allentro what is the status of this?

Hi Remi, sorry this has slipped my list. I'll get this complete tomorrow!

[RemDelaporteMathurin]

Hi @Allentro! Do you want someone else to pick up this PR?

[Allentro]

Hi @Allentro! Do you want someone else to pick up this PR?

Hi Remi,

This slipped my inbox.. I was just scrolling through my mentions and saw this. I'm happy to work on this tomorrow evening. Sorry for the delay on this.