Wrong coverage report

[Nisgrak]

Describe the bug

The coverage doesn't make sense with the actual code

Reproduction

Github repo: https://github.com/Nisgrak/vitest-coverage-bug

Execute pnpm i && pnpm test:unit

System Info

System:
    OS: Linux 5.10 Ubuntu 20.04.3 LTS (Focal Fossa)
    CPU: (16) x64 AMD Ryzen 7 4800H with Radeon Graphics
    Memory: 1.24 GB / 24.56 GB
    Container: Yes
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.13.1 - ~/.volta/tools/image/node/16.13.1/bin/node
    Yarn: 1.22.17 - ~/.volta/tools/image/yarn/1.22.17/bin/yarn
    npm: 8.1.2 - ~/.volta/tools/image/node/16.13.1/bin/npm
  Browsers:
    Firefox: 95.0.1
  npmPackages:
    vite: ^2.7.2 => 2.7.10 
    vitest: ^0.0.124 => 0.0.124

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[bompus]

I'm seeing the same issue. Running via c8 instead of using --coverage displays the correct uncovered line numbers.

Related #371

[Nisgrak]

The html report is good with c8 vitest, the text shows the line + 1 (its the 149 but shows the 150), so yes, isn't that bad

Upper vitest --coverage, lower c8 vitest

[Demivan]

@Nisgrak, try it now with Vitest v0.2.0

[Nisgrak]

Not very accurated. It improved but i think continues wrong.

I update the repo example so can try!

[Demivan]

@antfu When vite-node package was moved out, visitedFilesMap updates where removed. So now source-map data it missing - visitedFilesMap is always empty.

[cexbrayat]

I suppose this is the same root cause that @Demivan is mentioning, but Vue files aren't popping up in the report.
See with the provided example running in Stackblitz: https://stackblitz.com/edit/vitest-dev-vitest-ilb2yu?file=vitest.config.ts when you run npm run coverage with the all option:

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |       0 |        0 |       0 |       0 |                   

Adding a new TS file in components with no test does show up in the coverage though, so it looks like it is specific to Vue files