1 | ```javascript
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2 | var correct = require('spdx-correct')
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3 | var assert = require('assert')
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4 |
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5 | assert.equal(correct('mit'), 'MIT')
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6 |
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7 | assert.equal(correct('Apache 2'), 'Apache-2.0')
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8 |
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9 | assert(correct('No idea what license') === null)
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10 |
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11 | // disable upgrade option
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12 | assert(correct('GPL-3.0'), 'GPL-3.0-or-later')
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13 | assert(correct('GPL-3.0', { upgrade: false }), 'GPL-3.0')
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14 | ```
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