From 9416d390077332cada331fa1c8b7b710325ea461 Mon Sep 17 00:00:00 2001
From: Sergey Romanov <xxsmotur@gmail.com>
Date: Fri, 20 Mar 2015 23:34:16 +0500
Subject: [PATCH] append command for strings

---
 lib/redis-mock.js               |  4 ++++
 lib/strings.js                  | 13 +++++++++++
 test/redis-mock.strings.test.js | 40 +++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/lib/redis-mock.js b/lib/redis-mock.js
index 4c02bd5..921b846 100755
--- a/lib/redis-mock.js
+++ b/lib/redis-mock.js
@@ -203,6 +203,10 @@ RedisClient.prototype.setnx = RedisClient.prototype.SETNX = function (key, value
     stringfunctions.setnx.call(this, MockInstance, key, value, callback );
 }
 
+RedisClient.prototype.append = RedisClient.prototype.APPEND = function(key, value, callback) {
+  stringfunctions.append.call(this, MockInstance, key, value, callback)
+}
+
 /**
  * Hashing functions
  */
diff --git a/lib/strings.js b/lib/strings.js
index ca9bab3..9cff787 100644
--- a/lib/strings.js
+++ b/lib/strings.js
@@ -110,3 +110,16 @@ exports.setnx = function (mockInstance, key, value, callback) {
         });
     }
 };
+
+/**
+ * Append
+ */
+exports.append = function(mockInstance, key, value, callback) {
+    if (mockInstance.storage[key]) {
+       var newstr = mockInstance.storage[key].value + value;
+       exports.set(mockInstance, key, newstr);
+       mockInstance._callCallback(callback, null, newstr);
+    } else {
+      exports.set(mockInstance, key, value, callback);
+    }
+}
diff --git a/test/redis-mock.strings.test.js b/test/redis-mock.strings.test.js
index b29d955..7ade0e3 100644
--- a/test/redis-mock.strings.test.js
+++ b/test/redis-mock.strings.test.js
@@ -242,3 +242,43 @@ describe("setnx", function () {
 
     });
 });
+
+describe("append", function() {
+
+   it("should append two values after set", function(done) {
+
+      var r = redismock.createClient();
+
+      r.set("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();
+            });
+        });
+      });
+   });
+
+   it("should append two values after append command", function(done) {
+
+      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();
+            });
+        });
+      });
+   });
+});
+