append command for strings

[saromanov]

Hi guys! It looks, that append command is missing, so i added it.

   var r = redismock.createClient();
   r.append("foo", "bar1", function(err, result) {
     r.append("foo", "bar2", function(err, result) {
         r.get("foo", function(err, result) {
               result.should.equal("bar1bar2")
               r.end();
               done();
            });
        });
      });

[danielzurawski]

👍 Any chance for this PR to be merged at some point? It seems this project has been abandoned by its maintainer (last commit 2015) and this PR is open since last year.

[danielzurawski]

I have now moved onto https://github.com/hdachev/fakeredis which works as a drop-in alternative for this library. It has .append implemented and seems more feature rich (e.g. simulate latencies).