Closed
Description
Hi.
Using coverlet.msbuild.6.0.0, I noticed an issue with code coverage in generic methods that contain await using.
Here's a short example which reproduces the issue:
public static class A
{
public static async Task<int> Demo()
{
await using var example = new DisposableExample<int>();
var result = await Task.FromResult(42);
return result;
}
public static async Task<T> Demo<T>()
{
await using var example = new DisposableExample<T>();
var result = await Task.FromResult(default(T));
return result;
}
}
public class DisposableExample<T> : IAsyncDisposable
{
public ValueTask DisposeAsync()
{
GC.SuppressFinalize(this);
return ValueTask.CompletedTask;
}
}Given the following tests:
[Fact] public async Task One() => Assert.Equal(42, await A.Demo());
[Fact] public async Task Two() => Assert.Null(await A.Demo<string>());the first, non-generic method Demo() will have a 100% branch coverage. The branch coverage of generic method, Demo<T>(), will show a missing branch on line return result; (1 visits, 3 of 4 branches are covered).
Unless I missed something, I would expect the branch coverage to be 100% in both cases.