feat: parameterize tests for element and volume selection in post-processing

[germa89]

Description

As the title.

Also making sure we can do uncomplete selection plots.

Issue linked

Close #3782

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

Parameterize post-processing tests for incomplete element and node selections and add volume-based selection tests to verify plotting behavior with partial selections

Enhancements:

• Parameterize incomplete element selection tests using varying vmin, vmax, and vinc parameters
• Parameterize incomplete node selection tests using varying vmin, vmax, and vinc parameters
• Add parameterized volume selection test for plot_element_displacement

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

Refactors post-processing tests by parameterizing incomplete element and node selection ranges and introducing a parameterized volume selection test using pytest.mark.parametrize and dynamic mesh-based calculations.

File-Level Changes

Change	Details	Files
Parameterized incomplete element selection tests	Added pytest.mark.parametrize for vmin, vmax, vinc Replaced manual mapdl.esel calls with dynamic n_elem-based calculations Removed hardcoded selection cases	tests/test_post.py
Added parameterized volume selection test	Introduced test_plot_volume_selection with pytest.mark.parametrize over vol Invoked mapdl.vsel and mapdl.eslv per volume parameter	tests/test_post.py
Parameterized incomplete node selection tests	Applied pytest.mark.parametrize for vmin, vmax, vinc on node tests Refactored mapdl.nsel calls to use dynamic n_node-based calculations Eliminated redundant static selection logic	tests/test_post.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3782	Fix the crash that occurs when plotting nodal displacement after an incomplete node selection (e.g., after using mapdl.nsel with a subset of nodes).	✅
#3782	Ensure that incomplete element or node selections do not cause plotting functions (such as plot_nodal_displacement) to fail or crash Python.	✅
#3782	Add or update tests to verify that plotting with incomplete node or element selections works without errors.	✅

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[Copilot]

Pull Request Overview

This pull request refactors post-processing tests to use parameterized testing for element and node selection scenarios. The changes improve test coverage by systematically testing various selection ranges and increments, while also ensuring that incomplete selection plots function correctly.

• Converts hardcoded test cases to parameterized tests using pytest.mark.parametrize
• Adds systematic testing of different selection ranges (0-100%, 20-30%, etc.) with various increments
• Separates volume selection testing into a dedicated parameterized test method

Comments suppressed due to low confidence (1)

tests/test_post.py:1284

• The function name 'test_plot_incomplete_node_selection' should be 'test_plot_incomplete_nodal_selection' to maintain consistency with the original function name and the nodal displacement method being tested.

    def test_plot_incomplete_node_selection(mapdl, resume, vmin, vmax, vinc):

[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.36%. Comparing base (f021ab2) to head (c5dfd0c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4110      +/-   ##
==========================================
- Coverage   91.39%   91.36%   -0.04%     
==========================================
  Files         189      189              
  Lines       15667    15667              
==========================================
- Hits        14319    14314       -5     
- Misses       1348     1353       +5     

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬