TypeError: cannot read property 'split' of undefined

Hi,

version: 1.1.1

I am using Karma-coverage to generate lcov report with in-memory report like this:

coverageReporter: {
      dir: 'reports/',
      reporters: [
         { type: 'in-memory' },
         { type: 'lcov', subdir: 'report-lcov' },
      ]
   },

I am getting the error:

TypeError: Cannot read property 'split' of undefined
    at HtmlReport.writeDetailPage ({path}\node_modules\istanbul\lib\report\html.js:412:28)

I tried modifying the html.js to see the result. coverage is sending undefined value to istanbul in the end. My reports are generating properly, but this error fails my build. Is there a fix to it?

[sgen]

Ive been doing some debugging and I suspect the root cause is config.files is being passed to istanbul despite config.preProcessors patterns being set to instrument only some files.

This is the config for the project Im working on:

  config.set({
    frameworks: ["browserify", "jasmine"],
    files: [
       "helpers.js",
       "helpers.test.js",
    ],
    preprocessors: {
      'helpers.js': ['coverage', 'browserify'],
      'helpers.test.js': ['browserify']
    },
    reporters: ["progress", 'coverage'],
    browsers: ["Chrome"],
    client: {
      captureConsole: true,
    },
    logLevel: config.LOG_DEBUG,
    browserify: {
      debug: true,
      transform: ['browserify-istanbul']
    }
  });
};

Despite the preProcessor being set to only instrument helpers.js both helpers.js and helpers.test.js are being reported on.

The failure results from coverage report for helpers.test.js not containing the .code property, causing istanbul to check its file store for the contents of helpers.test.js via karma’s MemoryStore here. Apparently MemoryStore does not contain the source code thus causing the value of code to be undefined here.

I am not well versed in the internals of karma or karma-coverage but I will keep looking later today.

[jileeshs]

Thank you @michaelBenin