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const B = require('../').Buffer

const test = require('tape')

test('instanceof Buffer', function (t) {

const buf = new B([1, 2])

t.ok(buf instanceof B)

t.end()

})

test('convert to Uint8Array in modern browsers', function (t) {

const buf = new B([1, 2])

const uint8array = new Uint8Array(buf.buffer)

t.ok(uint8array instanceof Uint8Array)

t.equal(uint8array[0], 1)

t.equal(uint8array[1], 2)

t.end()

})

test('indexes from a string', function (t) {

const buf = new B('abc')

t.equal(buf[0], 97)

t.equal(buf[1], 98)

t.equal(buf[2], 99)

t.end()

})

test('indexes from an array', function (t) {

const buf = new B([97, 98, 99])

t.equal(buf[0], 97)

t.equal(buf[1], 98)

t.equal(buf[2], 99)

t.end()

})

test('setting index value should modify buffer contents', function (t) {

const buf = new B([97, 98, 99])

t.equal(buf[2], 99)

t.equal(buf.toString(), 'abc')

buf[2] += 10

t.equal(buf[2], 109)

t.equal(buf.toString(), 'abm')

t.end()

})

test('storing negative number should cast to unsigned', function (t) {

let buf = new B(1)

buf[0] = -3

t.equal(buf[0], 253)

buf = new B(1)

buf.writeInt8(-3, 0)

t.equal(buf[0], 253)

t.end()

})

test('test that memory is copied from array-like', function (t) {

const u = new Uint8Array(4)

const b = new B(u)

b[0] = 1

b[1] = 2

b[2] = 3

b[3] = 4

t.equal(u[0], 0)

t.equal(u[1], 0)

t.equal(u[2], 0)

t.equal(u[3], 0)

t.end()

})