modify code coverage

[mtar]

Description

Issue/s resolved: #719

Changes proposed:

• ignore code coverage of test files
• allow coverage to drop by 5%

Type of change

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

skip ci

[codecov]

Codecov Report

Merging #720 (81d32ed) into master (e26f946) will decrease coverage by 2.74%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
- Coverage   97.11%   94.37%   -2.75%     
==========================================
  Files          87       50      -37     
  Lines       18460     7390   -11070     
==========================================
- Hits        17927     6974   -10953     
+ Misses        533      416     -117     

Flag	Coverage Δ
unit	94.37% <ø> (?)
unittests	?

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Impacted Files	Coverage Δ
heat/naive_bayes/tests/test_gaussiannb.py
heat/cluster/tests/test_spectral.py
heat/graph/tests/test_laplacian.py
heat/core/tests/test_relational.py
heat/core/tests/test_dndarray.py
heat/core/linalg/tests/test_solver.py
heat/core/linalg/tests/test_basics.py
heat/core/tests/test_communication.py
heat/core/tests/test_operations.py
heat/core/tests/test_trigonometrics.py
... and 27 more

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[bhagemeier]

I generally agree with the changes. However, we may need to adjust the margin to be somewhat tighter than 5%. I assume that the drop by 2.75% in this case is due to the fact that all tests, which are covered to 100% by nature, have been removed from the coverage. OTOH, an addition of roughly 5% untested code is difficult to achieve the larger the project grows.