🔒 Does coverage.py support method coverage? | Python | Page 1

sage wyvern Sep 19, 2025, 8:35 PM

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I am using coverage.py to get line and branch coverage and it has been great. Now I heard of "Method Coverage" and I wonder if coverage.py (or py-cov) supports it. I have consulted https://coverage.readthedocs.io/, but there isn't mention to Method coverage, so maybe this is a no, but doesn't hurt to check with the experts.

The resulting XML would be as shown at https://github.com/danielpalme/ReportGenerator/blob/main/src/Testprojects/CSharp/Reports/Cobertura_coverlet.xml#L10

Maybe @dull timber knows a thing or two about this 😉
This is a snippet of the resulting XML. note the </methods> entry.

<?xml version="1.0" encoding="utf-8"?>
<coverage line-rate="0.7069" branch-rate="0.75" version="1.9" timestamp="1696364443" lines-covered="152" lines-valid="215" branches-covered="9" branches-valid="12">
  <sources>
    <source>C:\temp\</source>
  </sources>
  <packages>
    <package name="Test" line-rate="0.7069" branch-rate="0.75" complexity="60">
      <classes>
        <class name="Test.AbstractClass" filename="AbstractClass.cs" line-rate="1" branch-rate="1" complexity="1">
          <methods>
            <method name=".ctor" signature="()" line-rate="1" branch-rate="1" complexity="1">
              <lines>
                <line number="7" hits="4" branch="False" />
                <line number="8" hits="4" branch="False" />
                <line number="9" hits="4" branch="False" />
                <line number="10" hits="4" branch="False" />
              </lines>
            </method>
          </methods>
          <lines>
            <line number="7" hits="4" branch="False" />
            <line number="8" hits="4" branch="False" />
            <line number="9" hits="4" branch="False" />
            <line number="10" hits="4" branch="False" />
          </lines>
        </class>
      </packages>
</coverage>

Thanks

hollow valveBOT Sep 19, 2025, 8:35 PM

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sage wyvern I am using coverage.py to get line and branch coverage and it has been great. No...

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@sage wyvern

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src/Testprojects/CSharp/Reports/Cobertura_coverlet.xml line 10

<methods>```

dull timber Sep 19, 2025, 9:02 PM

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coverage.py can report on function and class coverage. If you generate an HTML report, you'll see Files, Functions, Classes at the top of the index page.

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but the XML report doesn't expose that information

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(function includes methods)

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coverage.py's xml report has <methods/>

sage wyvern Sep 19, 2025, 9:03 PM

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Thanks for the quick reply. I noticed the <methods/> and was wondering I was doing something wrong or indeed the support was not there.

dull timber Sep 19, 2025, 9:04 PM

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in theory we could put the same info from the HTML report into the XML report. I don't know if there's a Python/Java semantic mismatch to worry about or not. Probably not.

sage wyvern Sep 19, 2025, 9:04 PM

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The main reason for my question is that I found this super cool report generator that parses the <methods> entries to highlight it on a dashboard

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This is what drove me on this quest

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Have you heard of a module called fun-coverage? It seems to compute the <methods>, but only reports to the terminal. it doesnt update the XML with the extra info

dull timber Sep 19, 2025, 9:08 PM

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sage wyvern Have you heard of a module called `fun-coverage`? It seems to compute the `<met...

i haven't heard of it. it does it for Python?

sage wyvern Sep 19, 2025, 9:08 PM

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Yes, for python https://gitlab.com/redballoonsecurity/fun-coverage

The report would be something like

Name                                                                            Funcs   Miss   Cover   Missing
--------------------------------------------------------------------------------------------------------------
tests/example_test_suite/src/__init__.py                                            0      0    100%
tests/example_test_suite/src/async_function.py                                      1      0    100%
tests/example_test_suite/src/covered_function_with_partially_covered_lines.py       1      0    100%
tests/example_test_suite/src/docstring_only_function.py                             1      0    100%
tests/example_test_suite/src/excluded_function.py                                   0      0    100%
tests/example_test_suite/src/methods.py                                             2      2      0%   6, 9
tests/example_test_suite/src/non_covered_function.py                                1      1      0%   1
--------------------------------------------------------------------------------------------------------------
TOTAL                                                                               6      3     50%

GitLab

Red Balloon Security / fun-coverage · GitLab

Report function-level code coverage from the statement-level coverage of coverage.py

dull timber Sep 19, 2025, 9:10 PM

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it's fascinating that people will write something like this (using internal functions) but not drop me a line about it.

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Their report doesn't mention the function names? Just the number of functions?

sage wyvern Sep 19, 2025, 9:13 PM

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it seems so

dull timber Sep 19, 2025, 9:14 PM

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btw: we have a #coverage-py channel where a few others might be interested.

sage wyvern Sep 19, 2025, 9:16 PM

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oh, I didn't know, sorry. Just joined this channel after coming from coverage.py doc page.

dull timber Sep 19, 2025, 9:17 PM

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np

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i should put a specific link to the channel in the docs.

dull timber Sep 19, 2025, 9:17 PM

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sage wyvern oh, I didn't know, sorry. Just joined this channel after coming from coverage.py...

did the docs link to the discord?

sage wyvern Sep 19, 2025, 9:17 PM

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That would help Discord newbies like me 🙂

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Sort of. I found the Discord through https://nedbatchelder.com/site/aboutned.html, which was linked at https://coverage.readthedocs.io/en/7.10.6/#getting-help

dull timber Sep 19, 2025, 9:20 PM

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ah, good! the channel is linked from Contributing and FAQ, but not from there. thanks.

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https://github.com/nedbat/coveragepy/commit/a868ed9269ca474748130f5c6360cd2aae66ffc8

sage wyvern Sep 19, 2025, 9:33 PM

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Would you see this feature request as something valuable for consideration?

dull timber Sep 19, 2025, 9:34 PM

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sure, the info is already in the html and json reports, so why not?

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for all i know, there's already an issue about it.

sage wyvern Sep 19, 2025, 9:43 PM

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oh, I didnt see that. let me check the github issues again

dull timber Sep 19, 2025, 9:57 PM

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sage wyvern oh, I didnt see that. let me check the github issues again

sorry, i meant, "I don't know, there might be an issue"

sage wyvern Sep 19, 2025, 9:59 PM

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lol np. i went through the issues and didnt find anything mentioning it, so I filed one issue myself

hollow valveBOT Sep 19, 2025, 10:59 PM

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#🔒 Does coverage.py support method coverage?