You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.4 KiB
75 lines
1.4 KiB
var assert = require('assert') |
|
var UINT32 = require('..').UINT32 |
|
|
|
describe('subtract method', function () { |
|
|
|
describe('0-0', function () { |
|
|
|
it('should return 0', function (done) { |
|
var u = UINT32(0).subtract( UINT32(0) ) |
|
|
|
assert.equal( u.toNumber(), 0 ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
describe('1-0', function () { |
|
|
|
it('should return 1', function (done) { |
|
var u = UINT32(1).subtract( UINT32(0) ) |
|
|
|
assert.equal( u.toNumber(), 1 ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
describe('0-1', function () { |
|
|
|
it('should return -1', function (done) { |
|
var u = UINT32(0).subtract( UINT32(1) ) |
|
|
|
assert.equal( u.toNumber(), -1 ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
describe('low bit-high bit', function () { |
|
|
|
it('should return 0', function (done) { |
|
var n = Math.pow(2, 17) |
|
var u = UINT32(1).subtract( UINT32(n) ) |
|
|
|
assert.equal( u.toNumber(), 1-n ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
describe('high bit-low bit', function () { |
|
|
|
it('should return n', function (done) { |
|
var n = Math.pow(2, 17) |
|
var u = UINT32(n).subtract( UINT32(123) ) |
|
|
|
assert.equal( u.toNumber(), n - 123 ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
describe('high bit-high bit', function () { |
|
|
|
it('should return n', function (done) { |
|
var n = Math.pow(2, 17) |
|
var u = UINT32(n+1).subtract( UINT32(n) ) |
|
|
|
assert.equal( u.toNumber(), 1 ) |
|
done() |
|
}) |
|
|
|
}) |
|
|
|
})
|
|
|