node_modules/npm/node_modules/semver/test/clean.js

var tap = require('tap');
var test = tap.test;
var semver = require('../semver.js');
var clean = semver.clean;

test('\nclean tests', function(t) {
	// [range, version]
	// Version should be detectable despite extra characters
	[
		['1.2.3', '1.2.3'],
		[' 1.2.3 ', '1.2.3'],
		[' 1.2.3-4 ', '1.2.3-4'],
		[' 1.2.3-pre ', '1.2.3-pre'],
		['  =v1.2.3   ', '1.2.3'],
		['v1.2.3', '1.2.3'],
		[' v1.2.3 ', '1.2.3'],
		['\t1.2.3', '1.2.3'],
		['>1.2.3', null],
		['~1.2.3', null],
		['<=1.2.3', null],
		['1.2.x', null]
	].forEach(function(tuple) {
			var range = tuple[0];
			var version = tuple[1];
			var msg = 'clean(' + range + ') = ' + version;
			t.equal(clean(range), version, msg);
		});
	t.end();
});