Code coverage missing on Windows

[atifaziz]

Something is off with code coverage on Windows, which is being reported blank:

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

See attached CI build log for 9dd2d5e.

On Linux/macOS builds, however, the coverage collection seems to be working fine:

+----------+--------+--------+--------+
| Module   | Line   | Branch | Method |
+----------+--------+--------+--------+
| MoreLinq | 91.18% | 89.4%  | 92.97% |
+----------+--------+--------+--------+

+---------+--------+--------+--------+
|         | Line   | Branch | Method |
+---------+--------+--------+--------+
| Total   | 91.18% | 89.4%  | 92.97% |
+---------+--------+--------+--------+
| Average | 91.18% | 89.4%  | 92.97% |
+---------+--------+--------+--------+

See attached CI build log for 9dd2d5e.

I have not traced back to when and what introduced this issue.

---

• win-log.txt
• nix-log.txt

[atifaziz]

Seems like this might be linked to a known issue mentioned in coverlet's repo:

6) Code coverage returns NaN%

Symptoms: You are getting following result when running Coverlet within CI/CD pipeline:

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

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

SUT(System Under Test) assembly is also not listed in MSBuild logs - "Instrumented module" is missing for your dll.

Solution: Check whether deterministic build is turned on for your solution, if so, follow instructions how to handle Deterministic build.

[atifaziz]

Closed via 9ecd1dc that was merge of PR #845.