Code Coverage incorrectly being calculated for solution with multiple Tests projects and shared libraries

[fbridger]

Bug Report

When running CCS on a solution that has multiple test projects that shares multiple libraries (common libraries) it generates multiple code coverage files.

Visual Studio Code Coverage generates the calculation correctly which generates a line coverage of 80,27%

However, CCS is calculating a line coverage of 43%. It seems CCS is not calculating the code coverage correctly for projects that are shared as they sometime have 0% coverage when they are run in other Tests projects.

Example:

Coverage File: /github/workspace/coverage/08136505-8dcb-4358-9aeb-6c4c4593270a/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/cef530ca-79b4-480f-846c-475814d8b0b2/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/56c851f9-eb73-4de4-a39a-2c7a44bb88d1/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/7f265646-44cc-4a47-9eb2-3f87de515b25/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/a16ba91b-0337-4b63-9ee9-4a0a1891ec6c/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/3f139be9-5ce4-4548-990d-503e5b01882a/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/5c94f607-98e1-40ac-9613-d88dea525dee/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/a6f9626d-3b2f-449f-89b9-3ca3261ff43d/coverage.cobertura.xml
Coverage File: /github/workspace/coverage/194e7495-7f8c-4d06-b7c1-dd5d31aa9ad6/coverage.cobertura.xml

![Code Coverage](https://img.shields.io/badge/Code%20Coverage-43%25-critical?style=flat)

Package | Line Rate | Branch Rate | Health
-------- | --------- | ----------- | ------
Acme.Common.Aws | 95% | 100% | ✔
Acme.Common.Domain | 0% | 100% | ❌
Acme.Weather.Providers | 100% | 100% | ✔
Acme.Weather.Domain | 21% | 0% | ❌
Acme.Weather.Providers.AWS | 12% | 0% | ❌
Acme.Common.Aws | 0% | 0% | ❌
Acme.Common.Caching | 0% | 0% | ❌
Acme.Weather.Services | 97% | 81% | ✔
Acme.Common.Ftp | 0% | 0% | ❌
Acme.Weather.Providers.Http | 11% | 0% | ❌
Acme.Common.Domain | 0% | 100% | ❌
Acme.Weather.Providers.Azure | 0% | 100% | ❌
Acme.Weather.Providers.Ftp | 11% | 0% | ❌
Acme.Weather.Providers | 100% | 100% | ✔
Acme.Weather.Domain | 91% | 78% | ✔
Acme.Common.Api | 0% | 0% | ❌
Acme.Weather.Providers.AWS | 0% | 0% | ❌
Acme.Common.Aws | 0% | 0% | ❌
Acme.Weather.Services.Smart | 0% | 0% | ❌
Acme.Common.Caching | 0% | 0% | ❌
Acme.Weather.Services | 0% | 0% | ❌
Acme.Common.Ftp | 0% | 0% | ❌
Acme.Weather.Providers.Http | 0% | 0% | ❌
Acme.Common.Domain | 55% | 100% | ❌
Acme.Weather.Api | 80% | 63% | ➖
Acme.Weather.Providers.Azure | 0% | 100% | ❌
Acme.Weather.Providers.Ftp | 0% | 0% | ❌
Acme.Weather.Providers | 100% | 100% | ✔
Acme.Weather.Domain | 16% | 0% | ❌
Acme.Weather.Providers.AWS | 100% | 86% | ✔
Acme.Common.Aws | 0% | 0% | ❌
Acme.Common.Domain | 0% | 100% | ❌
Acme.Common.Api | 0% | 0% | ❌
Acme.Common.Domain | 0% | 100% | ❌
Acme.Weather.Providers | 100% | 100% | ✔
Acme.Weather.Domain | 22% | 0% | ❌
Acme.Weather.Providers.AWS | 0% | 0% | ❌
Acme.Common.Aws | 0% | 0% | ❌
Acme.Weather.Services.Smart | 92% | 91% | ✔
Acme.Common.Caching | 0% | 0% | ❌
Acme.Weather.Services | 0% | 0% | ❌
Acme.Common.Ftp | 0% | 0% | ❌
Acme.Weather.Providers.Http | 0% | 0% | ❌
Acme.Common.Domain | 0% | 100% | ❌
Acme.Weather.Providers.Azure | 0% | 100% | ❌
Acme.Weather.Providers.Ftp | 0% | 0% | ❌
Acme.Common.Repositories.Mongo | 75% | 36% | ➖
Acme.Common.Domain | 15% | 100% | ❌
Acme.Orders.Api | 93% | 62% | ✔
Acme.Common.Api | 50% | 12% | ❌
Acme.Shop.Domain | 100% | 100% | ✔
Acme.Common.Caching | 0% | 0% | ❌
Acme.Shop.Repositories | 100% | 100% | ✔
Acme.Common.Domain | 35% | 100% | ❌
Acme.Shop.Services | 0% | 100% | ❌
Acme.Common.Caching | 82% | 0% | ✔
Acme.Common.Domain | 30% | 100% | ❌
**Summary** | **43%** (1175 / 2936) | **33%** (252 / 766) | ❌

_Minimum allowed line rate is `60%`_

FAIL: Overall line rate below minimum threshold of 60%.

Linked To

https://github.com/irongut/CodeCoverageSummary/issues/38 https://github.com/irongut/CodeCoverageSummary/issues/19

[CFarinellaCM]

I encountered the same issue and tried the following which seems to be a workaround.

Try using reportgenerator to merge the reports:

      - name: Merge Coverage Reports
        run: reportgenerator -reports:./coverage/**/coverage.cobertura.xml -targetdir:./coverage -reporttypes:Cobertura

Then reference the merged filename instead of the wild card

- name: Code Coverage Report
        uses: irongut/CodeCoverageSummary@v1.3.0
        with:
          filename: ./coverage/Cobertura.xml

[github-actions[bot]]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this issue will be closed in 30 days.

[fbridger]

We did a workaround by aggregating the results of the tests using danielpalme/ReportGenerator-GitHub-Action

    - name: Setup .NET
      uses: actions/setup-dotnet@v4
      with:
        dotnet-version: 8.0.x

    - name: Restore dependencies 
      run: dotnet restore

    - name: Build 
      run: dotnet build --no-restore

    - name: Test 
      run: dotnet test --no-build --verbosity normal --collect:"XPlat Code Coverage" --results-directory ./coverage -l trx

    # https://reportgenerator.io/usage
    - name: Aggregate coverage files with ReportGenerator 
      uses: danielpalme/ReportGenerator-GitHub-Action@5.3.8
      with:
        reports: coverage/**/coverage.cobertura.xml
        targetdir: coveragereport
        reporttypes: Cobertura

    # https://github.com/irongut/CodeCoverageSummary
    - name: Code Coverage Report 
      uses: irongut/CodeCoverageSummary@v1.3.0
      with:
        filename: coveragereport/Cobertura.xml
        badge: true
        fail_below_min: true
        format: markdown
        hide_branch_rate: false
        hide_complexity: true
        indicators: true
        output: both
        thresholds: '60 80'