Add test for ansi-trim module

Author: isaacs

lib/utils/ansi-trim.js

@@ -1,7 +1,3 @@
-function ansiTrim (str) {
-  var r = new RegExp('\x1b(?:\\[(?:\\d+[ABCDEFGJKSTm]|\\d+;\\d+[Hfm]|' +
-        '\\d+;\\d+;\\d+m|6n|s|u|\\?25[lh])|\\w)', 'g')
-  return str.replace(r, '')
-}
-
-module.exports = ansiTrim
+const r = new RegExp('\x1b(?:\\[(?:\\d+[ABCDEFGJKSTm]|\\d+;\\d+[Hfm]|' +
+          '\\d+;\\d+;\\d+m|6n|s|u|\\?25[lh])|\\w)', 'g')
+module.exports = str => str.replace(r, '')

test/lib/utils/ansi-trim.js

@@ -0,0 +1,5 @@
+const t = require('tap')
+const ansiTrim = require('../../../lib/utils/ansi-trim.js')
+const chalk = require('chalk')
+t.equal(ansiTrim('foo'), 'foo', 'does nothing if no ansis')
+t.equal(ansiTrim(chalk.red('foo')), 'foo', 'strips out ansis')