test rewind

lib/model/addressmanager.js

@@ -41,9 +41,9 @@ AddressManager.prototype._incrementIndex = function(isChange) {
 AddressManager.prototype.rewindIndex = function(isChange, n) {
   n = _.isUndefined(n) ? 1 : n;
   if (isChange) {
-    this.changeAddressIndex -= n;
+    this.changeAddressIndex = Math.max(0, this.changeAddressIndex - n);
   } else {
-    this.receiveAddressIndex -= n;
+    this.receiveAddressIndex = Math.max(0, this.receiveAddressIndex - n);
   }
 };
 

test/models/addressmanager.js

@@ -33,4 +33,28 @@ describe('AddressManager', function() {
       am.getNewAddressPath(true).should.equal('m/2/1/0');
     });
   });
+  describe('#rewindIndex', function() {
+    it('should rewind main index', function() {
+      var am = AddressManager.create({});
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/0');
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/1');
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/2');
+      am.rewindIndex(false, 2);
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/1');
+    });
+    it('should rewind change index', function() {
+      var am = AddressManager.create({});
+      am.getNewAddressPath(true).should.equal('m/2147483647/1/0');
+      am.rewindIndex(false, 1);
+      am.getNewAddressPath(true).should.equal('m/2147483647/1/1');
+      am.rewindIndex(true, 2);
+      am.getNewAddressPath(true).should.equal('m/2147483647/1/0');
+    });
+    it('should stop at 0', function() {
+      var am = AddressManager.create({});
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/0');
+      am.rewindIndex(false, 20);
+      am.getNewAddressPath(false).should.equal('m/2147483647/0/0');
+    });
+  });
 });