nativefier/gulp/tests/mocha.js

import gulp from 'gulp';
import istanbul from 'gulp-istanbul';
import { Instrumenter } from 'isparta';
import mocha from 'gulp-mocha';
import PATHS from './../helpers/src-paths';

gulp.task('mocha', (done) => {
  gulp.src([PATHS.CLI_SRC_JS, '!src/cli.js'])
    .pipe(istanbul({
      instrumenter: Instrumenter,
      includeUntested: true,
    }))
    .pipe(istanbul.hookRequire()) // Force `require` to return covered files
    .on('finish', () => gulp.src(PATHS.TEST_SRC, { read: false })
      .pipe(mocha({
        compilers: 'js:babel-core/register',
        recursive: true,
      }))
      .pipe(istanbul.writeReports({
        dir: './coverage',
        reporters: ['lcov'],
        reportOpts: { dir: './coverage' },
      }))
      .on('end', done));
});

gulp.task('tdd', ['mocha'], () => gulp.watch(['src/**/*.js', 'test/**/*.js'], ['mocha']));