aaac7fed
 liuqimichale
add
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var assert = require('assert')
var UINT32 = require('..').UINT32
describe('shiftLeft method', function () {
describe('0<<1', function () {
it('should return 0', function (done) {
var u = UINT32(0).shiftLeft(1)
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('1<<2', function () {
it('should return 4', function (done) {
var u = UINT32(1).shiftLeft(2)
assert.equal( u.toNumber(), 4 )
done()
})
})
describe('1<<16', function () {
it('should return 2^16', function (done) {
var n = Math.pow(2, 16)
var u = UINT32(1).shiftLeft(16)
assert.equal( u.toNumber(), n )
done()
})
})
describe('1<<32', function () {
it('should return 0', function (done) {
var u = UINT32(1).shiftLeft(32)
assert.equal( u.toNumber(), 0 )
done()
})
})
describe('1<<31', function () {
it('should return 2^31', function (done) {
var u = UINT32(1).shiftLeft(31)
assert.equal( u.toString(16), '80000000' )
done()
})
})
describe('9<<28', function () {
it('should return 2^31', function (done) {
var u = UINT32(9).shiftLeft(28)
assert.equal( u.toString(16), '90000000' )
done()
})
})
})
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