test(genai_perf/plots): adding tests for plots module for better test coverage

[ahnsv]

What does the PR do?

Adding tests for plots module and enhance testability (e.g.,, moved tests/test_plot_config -> tests/test_plot/test_plot_config)
Additionally, adding a plot exception (plots/exceptions.py) that extends global exception class and handles plot-wise errors. For now just added EmptyDataError for the sake of shifting left.

Commit Type:

Check the conventional commit type
box here and add the label to the github PR.

• build
• ci
• docs
• feat
• fix
• perf
• refactor
• revert
• style
• test

Related PRs:

None

Where should the reviewer start?

See tests/test_plots/ directory

Test plan:

Caveats:

Background

I noticed plots/ module has lower test coverage comparing to other modules

==================================================== tests coverage =====================================================
___________________________________ coverage: platform darwin, python 3.13.5-final-0 ____________________________________

Name                                     Stmts   Miss  Cover
------------------------------------------------------------
genai_perf/plots/__init__.py                 0      0   100%
genai_perf/plots/base_plot.py               25     13    48%
genai_perf/plots/box_plot.py                20     12    40%
genai_perf/plots/heat_map.py                26     17    35%
genai_perf/plots/plot_config.py             24      0   100%
genai_perf/plots/plot_config_parser.py      74     37    50%
genai_perf/plots/plot_manager.py            25     14    44%
genai_perf/plots/scatter_plot.py            19     11    42%
------------------------------------------------------------
TOTAL                                      213    104    51%

This PR makes:

==================================================== tests coverage =====================================================
___________________________________ coverage: platform darwin, python 3.13.5-final-0 ____________________________________

Name                                     Stmts   Miss  Cover
------------------------------------------------------------
genai_perf/plots/__init__.py                 0      0   100%
genai_perf/plots/base_plot.py               28      3    89%
genai_perf/plots/box_plot.py                20      0   100%
genai_perf/plots/exceptions.py               5      0   100%
genai_perf/plots/heat_map.py                26      2    92%
genai_perf/plots/plot_config.py             24      0   100%
genai_perf/plots/plot_config_parser.py      74      0   100%
genai_perf/plots/plot_manager.py            25      2    92%
genai_perf/plots/scatter_plot.py            19      0   100%
------------------------------------------------------------
TOTAL                                      221      7    97%

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• closes GitHub issue: #xxx

[ahnsv]

Can anyone pick this up?