minor fixes in memory store for promise support

lib/stores/memory.js

@@ -45,7 +45,7 @@ var memoryStore = function(args) {
                 cb(null, value);
             });
         } else if (self.usePromises) {
-            return Promise.resolve(value)
+            return Promise.resolve(value);
         } else {
             return value;
         }
@@ -81,7 +81,7 @@ var memoryStore = function(args) {
                 cb(null, keys);
             });
         } else if (self.usePromises) {
-            return Promise.resolve();
+            return Promise.resolve(keys);
         } else {
             return keys;
         }

package.json

@@ -28,6 +28,7 @@
     "es6-promise": "^3.0.2",
     "istanbul": "^0.2.11",
     "jscs": "^1.9.0",
+    "jsdoc": "^3.3.0",
     "jshint": "^2.5.4",
     "mocha": "^1.20.1",
     "optimist": "^0.6.1",

test/caching.unit.js

@@ -237,10 +237,11 @@ describe("caching", function() {
 
     describe("keys()", function() {
         var keyCount;
-        var savedKeys = [];
+        var savedKeys;
 
         beforeEach(function(done) {
             keyCount = 10;
+            savedKeys = [];
             var processed = 0;
 
             cache = caching({store: 'memory'});
@@ -261,15 +262,47 @@ describe("caching", function() {
         it("calls back with all keys in cache", function(done) {
             cache.keys(function(err, keys) {
                 checkErr(err);
-                assert.deepEqual(keys.sort, savedKeys.sort);
+                assert.deepEqual(keys.sort(), savedKeys.sort());
                 done();
             });
         });
 
-        it("lets us get the keys without a callback (memory store only)", function() {
+        it("lets us set and get data without a callback, returning a promise", function(done) {
+            cache.keys()
+            .then(function(keys) {
+                assert.deepEqual(keys.sort(), savedKeys.sort());
+                done();
+            })
+            .catch(function(err) {
+                done(err);
+            });
+        });
+
+        context("when not using promises", function() {
+            beforeEach(function(done) {
+                savedKeys = [];
+                keyCount = 10;
+                var processed = 0;
+
                 cache = caching({store: memoryStore.create({noPromises: true})});
+
+                function isDone() {
+                    return processed === keyCount;
+                }
+
+                async.until(isDone, function(cb) {
+                    processed += 1;
+                    key = support.random.string(20);
+                    savedKeys.push(key);
+                    value = support.random.string();
+                    cache.set(key, value, cb);
+                }, done);
+            });
+
+            it("lets us get the keys without a callback (memory store only)", function() {
                 var keys = cache.keys();
-            assert.deepEqual(keys.sort, savedKeys.sort);
+                assert.deepEqual(keys.sort(), savedKeys.sort());
+            });
         });
     });
 

test/stores/memory.unit.js

@@ -17,7 +17,8 @@ describe("memory store", function() {
             memoryCache = memoryStore.create({noPromises: true});
         });
 
-        it("does not require a callback", function(done) {
+        // This test should pass in node v0.10.x:
+        it("does not require a callback or use of Promises", function(done) {
             memoryCache.set('foo', 'bar');
 
             setTimeout(function() {