gulp-jsx-coverage

gulp-jsx-coverage

Enable istanbul or isparta coverage on ES2015/babel or coffee-script files when you do mocha/jasmine tests, also deal with sourceMap for coverage report and stack trace.

Features

• Help you create a gulp task to handle mocha testing + istanbul coverage
• Transpile .jsx, .coffee, and ES2015 .js files on the fly
• Use babel (6to5) to transpile .js and .jsx files so you can use ES2015 features inside your .js and .jsx files!
• Customize everything by options
• Extract sourceMaps to hint original codes in istanbul reports
• sourceMaps on stack traces when mocha test failed
• coverage threshold
• 0.3.0 NEW support isparta

Check this chart to see features when gulp-jsx-coverage work with different coverage tools:

Features \ Coverage Tool	istanbul	isparta
Mocha testing	✅	✅
Jasmine testing	✅	✅
syntax: jsx	✅	✅
syntax: ES2015	✅	✅
syntax: coffee-script	✅	❌
coverage report	transpiled	original

• istanbul+mocha:hint original codes (jsx/es2015) in coverage reports
• istanbul+mocha:hint original coffee-script in coverage reports
• mocha:show original code/line when test failed
• isparta+mocha:show original codes in coverage reports

Install

npm install gulp-jsx-coverage mocha --save-dev

• You will need to install coffee-script when you require('foobar.coffee') or write tests as foobar.coffee
• You will need to install isparta when you enable isparta
• Regular JavaScript files with .js extension may use ES2015 features

Best Practices

• The golden rule: Use .jsx as ext name when jsx syntax inside it. Require it by require('file.jsx').
• The golden rule: Use .coffee as ext name when coffee script inside it. Require it by require('file.coffee').
• When you develop a module, do not use any module loader hooks. (Refer to Babel require hook document)
• Excludes transpiler directories as possible to improve performance.
• When you develop an application, you may use module loader hooks. But, don't enable the hook when you do testing.

Usage: General Mocha Test Creator

gulp.task('your_task_name', require('gulp-jsx-coverage').createTask({
    src: ['test/**/*.js', 'test/components/*.jsx'],  // will pass to gulp.src as mocha tests
    isparta: false,                                  // use istanbul as default
    istanbul: {                                      // will pass to istanbul or isparta
        preserveComments: true                       // required for istanbul 0.4.0+
        coverageVariable: '__MY_TEST_COVERAGE__',
        exclude: /node_modules|test[0-9]/            // do not instrument these files
    },

    threshold: 80,                                   // fail the task when coverage lower than this
                                                     // default is no threshold
    thresholdType: 'functions',                      // one of 'lines', 'statements', 'functions', 'banches'
                                                     // default is 'lines'

    transpile: {                                     // this is default whitelist/blacklist for transpilers
        babel: {
            include: /\.jsx?$/,
            exclude: /node_modules/,
            omitExt: false                           // if you wanna omit file ext when require(), put an array
        },                                           // of file exts here. Ex: ['.jsx', '.es6'] (NOT RECOMMENDED)
        coffee: {
            include: /\.coffee$/,
            omitExt: false                           // if you wanna omit file ext when require(), put an array
        }                                            // of file exts here. Ex: ['.coffee'] (NOT RECOMMENDED)
    },
    coverage: {
        reporters: ['text-summary', 'json', 'lcov'], // list of istanbul reporters
        directory: 'coverage'                        // will pass to istanbul reporters
    },
    mocha: {                                         // will pass to mocha
        reporter: 'spec'
    },
    babel: {                                         // will pass to babel-core
        presets: ['es2015', 'react'],                // Use proper presets or plugins for your scripts
        sourceMap: 'both'                            // get hints in covarage reports or error stack
    },
    coffee: {                                        // will pass to coffee.compile
        sourceMap: true                              // true to get hints in HTML coverage reports
    },

    //optional
    cleanup: function () {
        // do extra tasks after test done
        // EX: clean global.window when test with jsdom
    }
}));

Usage: Other Testing Frameworks

var GJC = require('gulp-jsx-coverage');
var jasmine = require('gulp-jasmine');

gulp.task('my_jasmine_tests', function () {
    GJC.initIstanbulHook(GJCoptions); // Refer to previous gulp-jsx-coverage options

    return gulp.src('test/*.js')
    .pipe(jasmine(jasmineOptions))
    .on('end', GJC.collectIstanbulCoverage(GJCoptions));
});

Usage: Use Isparta

gulp.task('your_task_name', require('gulp-jsx-coverage').createTask({
    src: ['test/**/*.js', 'test/components/*.jsx'],
    isparta: true,
    ....
});

NOTE: do not support coffee-script when using isparta as coverage tool

Live Example: mocha

git clone https://github.com/zordius/gulp-jsx-coverage.git
cd gulp-jsx-coverage
npm install
npm run mocha_test

Output:

[13:00:52] Using gulpfile ~/gulp-jsx-coverage/gulpfile.js
[13:00:52] Starting 'default'...


  target (tested by test1.js)
    ✓ should multiply correctly
    - should not show coverage info for test1.js
    ✓ should handle es6 template string correctly

  target (tested by test2.jsx)
    ✓ should multiply correctly
    - should not show coverage info for test2.jsx

  target (tested by test3.coffee)
    ✓ should multiply correctly
    - should not show coverage info for test3.coffee


  4 passing (42ms)
  3 pending

----------------|-----------|-----------|-----------|-----------|
File            |   % Stmts |% Branches |   % Funcs |   % Lines |
----------------|-----------|-----------|-----------|-----------|
   test/        |        80 |       100 |     66.67 |        80 |
      target.js |        80 |       100 |     66.67 |        80 |
----------------|-----------|-----------|-----------|-----------|
All files       |        80 |       100 |     66.67 |        80 |
----------------|-----------|-----------|-----------|-----------|

[13:00:53] Finished 'default' after 642 ms

• Check gulpfile.js for the sample input.
• Check coverage report directory for the sample output.

Upgrade Notice

0.3.0

• Babel upgraded:

  • You should add proper options.babel.plugins or options.babel.presets to transpile your script properly. Please refer to http://babeljs.io/docs/plugins/

• API changed:

  • you should rename all initIstanbulHookHack into initModuleLoaderHack

0.2.0

• the sourceMap stack trace feature requires:
  • mocha >= 2.2.2
  • the options.babel.sourceMap should be changed from 'inline' to 'both'