aaac7fed
 liuqimichale
add
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var assert = require('assert')
var UINT64 = require('..').UINT64
describe('div method', function () {
describe('1/0', function () {
it('should throw', function (done) {
assert.throws(
function () {
UINT64(1).div( UINT64(0) )
}
, function (err) {
if (err instanceof Error) return true
}
)
done()
})
})
describe('0/1', function () {
it('should return 0', function (done) {
var u = UINT64(2).div( UINT64(1) )
assert.equal( u.toNumber(), 2 )
done()
})
})
describe('2/1', function () {
it('should return 2', function (done) {
var u = UINT64(0).div( UINT64(1) )
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('1/2', function () {
it('should return 0', function (done) {
var u = UINT64(1).div( UINT64(2) )
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('low bit/high bit', function () {
it('should return n', function (done) {
var n = Math.pow(2, 17)
var u = UINT64(3).div( UINT64(n) )
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('high bit/low bit', function () {
it('should return n', function (done) {
var n = Math.pow(2, 17)
var u = UINT64(n).div( UINT64(3) )
assert.equal( u.toNumber(), (n/3)|0 )
assert.equal( u.remainder.toNumber(), 2 )
done()
})
})
describe('high bit/high bit', function () {
it('should return n', function (done) {
var n = 'FFFFFFFF'
var u = UINT64(n, 16).div( UINT64(n, 16) )
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('high bit/high bit 2', function () {
it('should return n', function (done) {
var u = UINT64('3266489917').div( UINT64('668265263') )
assert.equal( u.toNumber(), 4 )
done()
})
})
})
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