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// @flow
/* eslint-env mocha */
import assert from 'power-assert'
import assign from '.'
describe('assign', function() {
it('assigns properties of the second argument to the first argument', function() {
var object = {}
assign(object, { a: 1, b: 2, c: 3 })
assert.deepEqual(object, { a: 1, b: 2, c: 3 })
})
it('the object passed as 2nd argument remains unchanged when the result is mutated', function() {
var object = { a: 1, b: 2, c: 3 }
var result = assign({}, object)
result.c = 4
assert.deepEqual(object, { a: 1, b: 2, c: 3 })
})
it('returns the first argument when the second argument is `undefined`', function() {
var original = { a: 1, b: 2, c: 3 }
var result = assign(original, undefined)
assert(original === result)
})
it('throws TypeError exception if the first argument is `undefined', function() {
assert.throws(assign.bind(null, undefined, { a: 1, b: 2, c: 3 }), TypeError)
})
})
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