Error when using multiple referenced libraries

Lets say we have 3 projects.

Library
   |
   +--(Referenced by) Application
            |
            +--(Referenced by) Tests

In AppData\Temp, coverage is generated for "Application" but not for "Library", or even if it is generated, it fails with an error that could not find Library_SOME_GUID file. But there are multiple Application_SOME_GUID files in AppData\Temp.

I suspect, Library_SOME_GUID is written as Application_SOME_GUID

[tonerdo]

I'll take a look shortly and try to fix it.

[jbright]

I think that's the same issue I'm having.

[wlmiller]

I was having the same issue so I dug in to see what I could find - I believe it's actually two issues.

1. If the module is never hit by a test, CoverageTracker.MarkExecuted isn't called for that module and no hits file is created (this would be addressed by @jbright's PR).
2. CoverageTracker has a single static _path and a single list of _markers, which means that all the hits get written to the same file. So even if you have hits across multiple modules, they all get dumped into one file at the end.

This fixed it for me - https://github.com/wlmiller/coverlet/commit/c9e9afb835cb25dfe006c82851fc6dcb99810703. I'm happy to submit a PR but didn't want to step on the existing PR for this issue since it's still open.

[tonerdo]

@wlmiller by all means I'll love to have that PR, thanks for pointing out the issue.
You can just remove this line if (!File.Exists(result.HitsFilePath)) { continue; } if you're concerned about stepping on the existing PR and I also have my reservations about it

[tonerdo]

This has been fixed in #14. New NuGet bits drop by Monday

[tonerdo]

@wlmiller did some tests locally and found out that the implementation of CoverageTracker.MarkExecuted wasn't thread-safe from the onset. Your change simply brought that to light, here's the fix if you're interested c055f95