Zero Coverage Reported coverlet.msbuild

So I run

dotnet test /p:CollectCoverage=true /p:CoverletOutput=./coverage_report/raw_coverage_results.xml /p:CoverletOutputFormat=cobertura

I see that my tests ran successfully

Test run for C:\blahblah\Test\bin\Debug\netcoreapp3.0\Test.dll(.NETCoreApp,Version=v3.0)
Microsoft (R) Test Execution Command Line Tool Version 16.3.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...

A total of 1 test files matched the specified pattern.

Test Run Successful.
Total tests: 28
     Passed: 28
 Total time: 1.4392 Minutes

Calculating coverage result...
  Generating report '.\coverage_report\raw_coverage_results.xml'

+--------+------+--------+--------+
| Module | Line | Branch | Method |
+--------+------+--------+--------+

+---------+------+--------+--------+
|         | Line | Branch | Method |
+---------+------+--------+--------+
| Total   | 100% | 100%   | 100%   |
+---------+------+--------+--------+
| Average | NaN% | NaN%   | NaN%   |
+---------+------+--------+--------+

But my resulting file (.\coverage_report\raw_coverage_results.xml) ends up having no information. Just the following:

<?xml version="1.0" encoding="utf-8"?>
<coverage line-rate="1" branch-rate="1" version="1.9" timestamp="1580346044" lines-covered="0" lines-valid="0" branches-covered="0" branches-valid="0">
  <sources />
  <packages />
</coverage>

Here’s my result of dotnet list package

Project 'Test' has the following package references
   [netcoreapp3.0]:
   Top-level Package                                Requested   Resolved
   > coverlet.msbuild                               2.8.0       2.8.0
   > Microsoft.NET.Test.Sdk                         16.4.0      16.4.0
   > nunit                                          3.12.0      3.12.0
   > NUnit3TestAdapter                              3.13.0      3.13.0
   > System.Configuration.ConfigurationManager      4.5.0       4.5.0
   > System.Json                                    4.5.0       4.5.0

I have a feeling this may have to do with me upgrading to .net core 3.0. I was previously running my main application under the .net framework version 4.7.2 and I was getting coverage results back then.

Any help would be greatly appreciated.

[przerull]

Ah, thanks again for the help. You’re doing an outstanding job supporting this tool.

I reviewed the code and yes, my common.cs file uses Fody/PropertyChanged, which injects code into some of the classes in that file to deal with OnPropertyChanged events, making it autogenerated.

It makes perfect sense. Trying to measure coverage on code which gets modified dynamically prior to compilation is a quixotic task. Thank you so much for helping me come to this conclusion.

[MarcoRossignoli]

Glad to hear! thanks for using coverlet!