coverage summary always 100%

Expected behavior

should report coverage summary correctly

Actual behavior

always output

Statements   : 100% ( 0/0 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 0/0 )
Lines        : 100% ( 0/0 )

Enviroment Details

• Karma version (output of karma --version): 1.1.0
• Relevant part of your karma.config.js file

coverageReporter: {
    reporters: [
        { type: 'text-summary' }, // always 100%
        { type: 'text-summary', file: 'lcov.txt' } // reported file is correct
    ]
  }

Steps to reproduce the behaviour

1.just run 2. 3.

[nicojs]

I think i have the same issue. It only occurs with karma 1.1.0, not 1.0.0 or 0.13.x. As the problem seems to be introduced in karma 1.1, i think the issue should be in the karma issue tracker

There seems to be a raise condition. I think karma is collecting the reports too soon. Usually this doesn’t result in an error because the html reporter first needs to verify that the directory structure is created (with fs.stats, see reporter.js). By then, the collector is filled. However for Stryker we’re using the in-memory reporter. That one tries to collect the report immediately which usually fails with karma 1.1.0.

If i surround reporter.js L290 with a setTimeout the collector is always filled.

I have been debugging this issue for hours, but my inside karma knowledge is just too small. Can someone point me in the right direction? Namely: did something in the life cycle of reporting change what could explain this raise condition?

See this build output (with karma 1.1.0): https://travis-ci.org/stryker-mutator/stryker-karma-runner/jobs/140456228

Note: I see in the bug request that the text-summary has the same issue, which makes sense as it is also reporting immediately, without the creation of the file system.

[dignifiedquire]

I’ve implemented a fix, thanks for the research