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Coverage returning %NaN% for .Net Core 3 project with integrated xUnit tests

See original GitHub issue

I’ve created about the simplest test case I can that demonstrates the issue. The test is in the same project as the code being tested, also I’m using git bash, but that should be immaterial.

https://github.com/tracker1/bug-dotnet-test-coverage

run-tests.sh

rm -rf bin obj coverage TestResults

dotnet clean

dotnet test \
  -p:Include="[test_coverage.]" \
  -p:Exclude="[*.Test.*]*" \
  -p:CollectCoverage=true \
  -p:CoverletOutputFormat=cobertura \
  -p:CoverletOutput=./coverage/coverage.cobertura.xml

The output I see is as follows…

test-coverage on  master via •NET v3.0.100 took 4s
❯ ./run-tests.sh
Microsoft (R) Build Engine version 16.3.0+0f4c62fea for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

Build started 12/2/2019 3:05:04 PM.
     1>Project "C:\Users\mryan\src\...\test-coverage\test-coverage.csproj" on node 1 (Clean target(s)).
     1>CoreClean:
         Creating directory "obj\Debug\netcoreapp3.0\".
     1>Done Building Project "C:\Users\mryan\src\...\test-coverage\test-coverage.csproj" (Clean target(s)).

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:00.38
Test run for C:\Users\mryan\src\...\test-coverage\bin\Debug\netcoreapp3.0\test-coverage.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: 1
     Passed: 1
 Total time: 1.2258 Seconds

Calculating coverage result...
  Generating report '.\coverage\coverage.cobertura.xml'

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

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