add node modules to repo

node_modules/cuint/test/UINT64_subtract-test.js

@@ -0,0 +1,75 @@
+var assert = require('assert')
+var UINT64 = require('..').UINT64
+
+describe('subtract method', function () {
+
+  describe('0-0', function () {
+
+    it('should return 0', function (done) {
+      var u = UINT64(0).subtract( UINT64(0) )
+
+      assert.equal( u.toNumber(), 0 )
+      done()
+    })
+
+  })
+
+  describe('1-0', function () {
+
+    it('should return 1', function (done) {
+      var u = UINT64(1).subtract( UINT64(0) )
+
+      assert.equal( u.toNumber(), 1 )
+      done()
+    })
+
+  })
+
+  describe('0-1', function () {
+
+    it('should return -1', function (done) {
+      var u = UINT64(0).subtract( UINT64(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 = UINT64(1).subtract( UINT64(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 = UINT64(n).subtract( UINT64(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 = UINT64(n+1).subtract( UINT64(n) )
+
+      assert.equal( u.toNumber(), 1 )
+      done()
+    })
+
+  })
+
+})