diff --git a/test/test.SIN.js b/test/test.SIN.js
index 23d117a..eee75e0 100644
--- a/test/test.SIN.js
+++ b/test/test.SIN.js
@@ -37,7 +37,7 @@ describe('SIN', function() {
 
   describe('#SIN', function() {
     it('should be able to create a new SIN with a version byte', function() {
-      var myhash = bitcore.util.sha256ripe160('test');
+      var myhash = new Buffer('1ab59a0fd1d5fc446d38746ee033c8af57ed6bc0', 'hex');
       var sin = new SIN(SIN.SIN_EPHEM, myhash);
       should.exist(sin);
     });
@@ -48,6 +48,13 @@ describe('SIN', function() {
       }).should.throw();
     });
  
+    it('should fail with wrong sized hash', function() {
+      var myhash = new Buffer('111ab59a0fd1d5fc446d38746ee033c8af57ed6bc0', 'hex');
+      ( function (){ 
+        var sin = new SIN(SIN.SIN_EPHEM, myhash);
+      }).should.throw();
+    });
+ 
   });
   describe('#fromPubKey', function() {
     it('should fail to create  a new SIN not using a pub key', function() {