chushihua

node_modules/cuint/test/UINT64_negate-test.js

@@ -0,0 +1,51 @@
+var assert = require('assert')
+var UINT64 = require('..').UINT64
+
+describe('negate method', function () {
+
+  describe('0', function () {
+
+    it('should return 0', function (done) {
+      var u = UINT64(0).negate()
+
+      assert.equal( u.toNumber(), 0 )
+      done()
+    })
+
+  })
+
+  describe('1', function () {
+
+    it('should return -1', function (done) {
+      var u = UINT64(1).negate()
+
+      assert.equal( u.toNumber(), -1 )
+      done()
+    })
+
+  })
+
+  describe('low bit', function () {
+
+    it('should return -n', function (done) {
+      var u = UINT64(3).negate()
+
+      assert.equal( u.toNumber(), -3 )
+      done()
+    })
+
+  })
+
+  describe('high bit', function () {
+
+    it('should return -n', function (done) {
+      var n = Math.pow(2, 17)
+      var u = UINT64(n).negate()
+
+      assert.equal( u.toNumber(), -n )
+      done()
+    })
+
+  })
+
+})