coverage-average

Computes the average coverage from a text-summary file like:

 
=============================== Coverage summary ===============================
Statements   : 94.55% ( 52/55 )
Branches     : 100% ( 6/6 )
Functions    : 85% ( 17/20 )
Lines        : 94.44% ( 51/54 )
================================================================================

Why

Use it in your CI builds to force a failure if test coverage falls below your desired percentage.

Usage

Output average:

$ coverage-average path/to/text-summary.txt
Coverage average is 93.50%

Output average, exit 1 if average is below threshold

$ coverage-average path/to/text-summary.txt --limit 95
FAIL Coverage average of 93.50% is below limit of 95.00%

$ coverage-average path/to/text-summary.txt --limit 90
PASS Coverage average of 93.50% is above limit of 95.00%

Example

To have this module calculate the average coverage based on karma-coverage generated results, use a karma.conf.js file similar to:

module.exports = function(config) {
  config.set({
    frameworks: ['jasmine'],
    files: [
      'bower_components/angular/angular.js',
      'bower_components/angular-mocks/angular-mocks.js',
      'src/**/*.js,
      'test/unit/**/*.js'
    ],
    browsers: ['PhantomJS'],
    reporters: ['dots', 'coverage'],
    preprocessors: {
      'src/**/*.js': ['coverage']
    },
    plugins: [
      'karma-phantomjs-launcher',
      'karma-coverage',
      'karma-jasmine'
    ],
    coverageReporter: {
      reporters: [{
        type: 'text-summary',
        subdir: '.',
        file: 'text-summary.txt'
      }]
    }
  });
};

The summary file will be located at coverage/text-summary/text-summary.txt.

Calculate the average with:

$ coverage-average coverage/text-summary/text-summary.txt` --limit 95

See sn-sticky-table-header for a working example.