[BUG] UInt#parse_number should support zero. Add tests.

Author: justmoon

src/js/ripple/uint.js

@@ -234,7 +234,7 @@ UInt.prototype.parse_number = function (j) {
 
   if ("number" === typeof j &&
       j === +j &&
-      j > 0) {
+      j >= 0) {
     // XXX Better, faster way to get BigInteger from JS int?
     this._value = new BigInteger(""+j);
   }

test/uint-test.js

@@ -0,0 +1,25 @@
+var assert  = require('assert');
+var utils   = require('./testutils');
+var UInt128 = utils.load_module('uint128').UInt128;
+var config  = require('./testutils').get_config();
+
+describe('UInt', function() {
+  describe('128', function() {
+    describe('#parse_number', function () {
+      it('should create 00000000000000000000000000000000 when called with 0', function () {
+        var val = UInt128.from_number(0);
+        assert.strictEqual(val.to_hex(), '00000000000000000000000000000000');
+      });
+      it('should create 00000000000000000000000000000001 when called with 1', function () {
+        var val = UInt128.from_number(0);
+        assert.strictEqual(val.to_hex(), '00000000000000000000000000000000');
+      });
+      it('should create 000000000000000000000000FFFFFFFF when called with 0xFFFFFFFF', function () {
+        var val = UInt128.from_number(0xFFFFFFFF);
+        assert.strictEqual(val.to_hex(), '000000000000000000000000FFFFFFFF');
+      });
+    });
+  });
+});
+
+// vim:sw=2:sts=2:ts=8:et