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const flatten = require('./')
const TestRunner = require('test-runner')
const a = require('assert')
const runner = new TestRunner()
runner.test('flatten', function () {
const numbers = [ 1, 2, [ 3, 4 ], 5 ]
const result = numbers.reduce(flatten, [])
a.deepStrictEqual(result, [ 1, 2, 3, 4, 5 ])
})