get automated coverage data

[willi84]

use following config

_fs.writeFileSync('beautified.js', uglyfyJS.minify(code, {
		mangle: false,
		compress: {
			assignments: false,
			collapse_vars: false,
			comparisons: false,
			conditionals: false,
			if_return: false,
			reduce_vars: true,
			sequences: false,
			side_effects: false,
			unused: false,
		},
		output: {
			beautify: true
		},
	}).code, FILE_ENCODING);