Option --threshold doesn't work, coverage.json is empty

Hi there!

I am trying to implement Coverlet in my pre-commit script, unit tests are still to be written. I am using this option: coverlet CBPm.Validations.Test --target "dotnet" --targetargs "test . --no-build" --threshold 80

This snippet sholud retrun non zero value if code coverage is less than 80%. In my case code coverge is 0% and I still get zero exit code instead of non zero exit code.

In addition to this coverage.json file is generated but it is empty.

Any help would be appreciated.

Kind regards! 😃

[milica-nikolic]

Hi Dave,

Thank you for your help and instructions.

I managed to get it working using coverlet.msbuild in GitLab CI pipeline, everything works properly now.

Here is snippet of code, maybe it will be helpful for other developers 😃

code coverage:
  stage: Test
  image: mcr.microsoft.com/dotnet/nightly/sdk:3.1
  allow_failure: false
  before_script:
    - cd ./Path.To.Tests
    - dotnet add package coverlet.msbuild
  script:
    - cd ..
    - mkdir coverletReport
    - dotnet test /p:CollectCoverage=true /p:Threshold=0 /p:CoverletOutput=testResults/ /p:CoverletOutputFormat=opencover
    - mv ./Path.To.Tests/testResults/coverage.opencover.xml coverletReport
  artifacts:
    when: always
    paths:
      - coverletReport
    expire_in: 8 week
  tags:
    - dev
    - docker

[daveMueller]

I guess your ouput looks somewhat like this?

Calculating coverage result...
  Generating report 'D:\Repos\coverlet\src\coverlet.console\bin\Debug\net5.0\coverage.json'
+--------+------+--------+--------+
| Module | Line | Branch | Method |
+--------+------+--------+--------+

+---------+------+--------+--------+
|         | Line | Branch | Method |
+---------+------+--------+--------+
| Total   | 0%   | 0%     | 0%     |
+---------+------+--------+--------+
| Average | 0%   | 0%     | 0%     |
+---------+------+--------+--------+


D:\Repos\coverlet\src\coverlet.console\bin\Debug\net5.0\coverlet.console.exe (process 25356) exited with code 0.

Your solution doesn’t seem to have any module or the module can’t be detected by coverlet. Thus coverlet can’t instrument any module and isn’t able to calculate any coverage. If the coverage result is empty then also the coverage report is empty.

The command in your first comment should return a non zero exit code even when no assemblies can be instrumented. This is a bug, thanks for reporting 👍. It seems that I missed this while working on #1083.