aaac7fed
 liuqimichale
add
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var assert = require('assert')
var UINT64 = require('..').UINT64
describe('shiftRight method', function () {
describe('0>>1', function () {
it('should return 0', function (done) {
var u = UINT64(0).shiftRight(1)
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('4>>2', function () {
it('should return 1', function (done) {
var u = UINT64(4).shiftRight(2)
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('2^16>>16', function () {
it('should return 1', function (done) {
var n = Math.pow(2, 16)
var u = UINT64(n).shiftRight(16)
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('1>>32', function () {
it('should return 0', function (done) {
var u = UINT64(1).shiftRight(32)
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('2^31>>31', function () {
it('should return 1', function (done) {
var u = UINT64('80000000', 16).shiftRight(31)
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('2^28>>28', function () {
it('should return 1', function (done) {
var u = UINT64('10000000', 16).shiftRight(28)
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('2^31+2^28>>31', function () {
it('should return 1', function (done) {
var u = UINT64('90000000', 16).shiftRight(31)
assert.equal( u.toNumber(), 1 )
done()
})
})
describe('2^31+2^28>>28', function () {
it('should return 9', function (done) {
var u = UINT64('90000000', 16).shiftRight(28)
assert.equal( u.toNumber(), 9 )
done()
})
})
})
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