A minimal reproducible example:
$ cat pyproject.toml
[tool.coverage.report]
exclude_lines = ['raise NotImplementedError']
$ cat -n test_a.py
1 def foo(x):
2 if x == 1:
3 raise NotImplementedError
4 return x
5
6 def bar(x, y):
7 if all(_ == __ for _, __ in zip(x, y)):
8 raise NotImplementedError
9 return x
10
11
12 def test_0():
13 foo(0)
14 bar([0], [1])
$ pytest -q --cov test_a test_a.py --cov-branch --cov-report=term-missing
. [100%]
----------- coverage: platform linux, python 3.9.2-final-0 -----------
Name Stmts Miss Branch BrPart Cover Missing
-------------------------------------------------------
test_a.py 9 0 2 2 82% 7->8, 7->exit
-------------------------------------------------------
TOTAL 9 0 2 2 82%
1 passed in 0.06s
$ pip list |egrep 'pytest|coverage'
coverage 6.0.2
coverage-enable-subprocess 1.0
pytest 6.2.5
pytest-cov 3.0.0
pytest-doctestplus 0.9.0
pytest-forked 1.3.0
pytest-timeout 2.0.1
pytest-xdist 2.4.0
It seems for me, that the branch condition on the line 7 should be ignored as well as on the line 2.
See also this example, notice "pragma" statement to workaround the problem.
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