Branch coverage with async calls

I have a project using EF Core with async methods that shows a branch at each await call. One of the branches always shows as uncovered. I’ve created a sample repo that repoduces the problem here. You can see the branch in the coverage report but the referenced line does not have a branch.

Here is the output of dotnet test:

$ dotnet test /p:CollectCoverage=true
Build started, please wait...
Build completed.

Test run for /Users/clucas/Source/clucas/coverlet-test/Test/bin/Debug/netcoreapp2.1/Test.dll(.NETCoreApp,Version=v2.1)
Microsoft (R) Test Execution Command Line Tool Version 15.7.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...

Total tests: 1. Passed: 1. Failed: 0. Skipped: 0.
Test Run Successful.
Test execution time: 2.0845 Seconds

Calculating coverage result...
  Generating report '/Users/clucas/Source/clucas/coverlet-test/Test/coverage.json'

+---------+--------+--------+--------+
| Module  | Line   | Branch | Method |
+---------+--------+--------+--------+
| Example | 90.9%  | 50%    | 80%    |
+---------+--------+--------+--------+

I tired another example with await HttpClient.GetAsync(...) but that did not seem to produce the same issue so this doesn’t appear to apply to all awaited calls.

[tonerdo]

Thanks for reporting this guys. I’m currently working on general improvements to the coverage logic so will add this to the list. Thanks for the test project @abe545

[sugarjig]

I’m seeing this issue still in version 2.5.1 (that’s the version number in Nuget).