Implemented fakebackend remove_relation

app/store/env/sandbox.js

 'use strict';
 
 /**
 Sandbox APIs mimicking communications with the Go and Juju backends.
 
 @module env
 @submodule env.sandbox
 */
 
 YUI.add('juju-env-sandbox', function(Y) {
@@ skipping 541 matching lines @@
       data.err = res.error;
       data.result = (res.error === undefined);
 
       this.get('client').receiveNow(data);
     },
 
     /**
       Handles adding a relation between two supplied services from the client
 
       @method performOp_add_relation
-      @param {Array | String} data containing either a string in the format
-        wordpress:db or an array in the format
-        ['wordpress', { name: 'db', role: 'client'}].
+      @param {Object} data Object contains the operation, two endpoint strings
+        and request id.
     */
     performOp_add_relation: function(data) {
       var relation = this.get('state').addRelation(
           data.endpoint_a, data.endpoint_b);
 
       if (relation === false) {
         // If everything checks out but could not create a new relation model
         data.err = 'Unable to create relation';
         this.get('client').receiveNow(data);
         return;
@@ skipping 13 matching lines @@
       data.result = {
         endpoints: [epA, epB],
         id: relation.relationId,
         // interface is a reserved word
         'interface': relation.type,
         scope: relation.scope,
         request_id: data.request_id
       };
 
       this.get('client').receive(data);
+    },
+
+    /**
+      Handles removing a relation between two supplied services from the client
+
+      @method performOp_remove_relation
+      @param {Object} data Object contains the operation, two endpoint strings
+        and request id.
+    */
+    performOp_remove_relation: function(data) {
+      var relation = this.get('state').removeRelation(
+          data.endpoint_a, data.endpoint_b);
+
+      if (relation.error) {
+        data.err = relation.error;
+      } else {
+        data.result = true;
+      }
+
+      this.get('client').receive(data);
     }
+
   });
 
   sandboxModule.PyJujuAPI = PyJujuAPI;
 }, '0.1.0', {
   requires: [
     'base',
     'timers',
     'json-parse'
   ]
 });