False nosec encountered warning

Describe the bug

The warning text "WARNING nosec encountered (X), but no failed test on line Y" incorrectly appears in some cases. It may also appear more than once for the same line number and test under specific circumstances.

Reproduction steps

Consider this base code:

import shlex
import subprocess
proc = subprocess.Popen(args=shlex.split("ffmpeg -i file.mp3"))

Since there are 2 function calls on this line of code, there are 2 calls to run_tests in bandit/core/issue.py.

If we include a nosec comment specifying the correct test to ignore (i.e. B603):

import shlex
import subprocess
proc = subprocess.Popen(args=shlex.split("ffmpeg -i file.mp3"))  # nosec: B603

the following warning text displays:

WARNING	nosec encountered (B603), but no failed test on line 3

If we include a nosec comment specifying something else (e.g. B602):

import shlex
import subprocess
proc = subprocess.Popen(args=shlex.split("ffmpeg -i file.mp3"))  # nosec: B602

the following warning text displays:

WARNING	nosec encountered (B602), but no failed test on line 3
WARNING	nosec encountered (B602), but no failed test on line 3

Expected behavior

• The warning text should not appear more than once for the same line number and test.
• The warning should only appear if there is no failed test on the line for the specified test only.

Bandit version

1.7.5 (Default)

Python version

3.10

Additional context

No response

Start in bandit/core/issue.py, focusing on the run_tests calls and nosec warning handling described by the reproduction. Reproduce the B603 and B602 examples, then check the existing test coverage around these warnings. Done means each warning is emitted at most once per line and test, and only when that specified test has no failure on the line.