| ```javascript | |
| var correct = require('spdx-correct') | |
| var assert = require('assert') | |
| assert.equal(correct('mit'), 'MIT') | |
| assert.equal(correct('Apache 2'), 'Apache-2.0') | |
| assert(correct('No idea what license') === null) | |
| // disable upgrade option | |
| assert(correct('GPL-3.0'), 'GPL-3.0-or-later') | |
| assert(correct('GPL-3.0', { upgrade: false }), 'GPL-3.0') | |
| ``` |