Wallet Model: Check that "m" and "n" arguments are numbers

lib/model/wallet.js

@@ -18,6 +18,9 @@ Wallet.create = function(opts) {
 
   var x = new Wallet();
 
+  $.checkArgument(_.isNumber(opts.m), '"m" is expected to be a number');
+  $.checkArgument(_.isNumber(opts.n), '"n" is expected to be a number');
+
   x.version = '1.0.0';
   x.createdOn = Math.floor(Date.now() / 1000);
   x.id = opts.id || Uuid.v4();
@@ -44,6 +47,9 @@ Wallet.create = function(opts) {
 Wallet.fromObj = function(obj) {
   var x = new Wallet();
 
+  $.checkArgument(_.isNumber(obj.m), '"m" is expected to be a number');
+  $.checkArgument(_.isNumber(obj.n), '"n" is expected to be a number');
+
   x.version = obj.version;
   x.createdOn = obj.createdOn;
   x.id = obj.id;

test/models/wallet.js

@@ -9,7 +9,26 @@ var Wallet = require('../../lib/model/wallet');
 
 describe('Wallet', function() {
 
+  describe('#create', function() {
+    it('will throw with an invalid string argument for "m" or "n"', function() {
+      (function() {
+        Wallet.create({m: '2', n: 2});
+      }).should.throw('"m" is expected to be a number');
+      (function() {
+        Wallet.create({m: 2, n: '2'});
+      }).should.throw('"n" is expected to be a number');
+    });
+  });
+
   describe('#fromObj', function() {
+    it('will throw with an invalid string argument for "m" or "n"', function() {
+      (function() {
+        Wallet.fromObj({m: '2', n: 2});
+      }).should.throw('"m" is expected to be a number');
+      (function() {
+        Wallet.fromObj({m: 2, n: '2'});
+      }).should.throw('"n" is expected to be a number');
+    });
     it('read a wallet', function() {
       var w = Wallet.fromObj(testWallet);
       w.isComplete().should.be.true;