Add specs for mock date

src/core/Clock.js

@@ -15,14 +15,6 @@ getJasmineRequireObj().Clock = function() {
       },
       installed = false;
 
-    if (date) {
-      var realDate = {
-        Date: global.Date
-      },
-      fakeDate = {
-        Date: date.Date
-      };
-    }
 
     self.install = function(mockDate) {
       replace(global, fakeTimingFunctions);
@@ -31,15 +23,13 @@ getJasmineRequireObj().Clock = function() {
 
       if (date && mockDate) {
         date.install(mockDate);
-        replace(global, fakeDate);
       }
     };
 
     self.uninstall = function() {
       delayedFunctionScheduler.reset();
       if (date) {
-        date.reset();
-        replace(global, realDate);
+        date.uninstall();
       }
       replace(global, realTimingFunctions);
 

src/core/MockDate.js

@@ -6,16 +6,20 @@ getJasmineRequireObj().MockDate = function() {
     if (!global || !global.Date) {
       self.install = function() {};
       self.tick = function() {};
-      self.reset = function() {};
+      self.uninstall = function() {};
       return self;
     }
 
+    var GlobalDate = global.Date;
+
     self.install = function(mockDate) {
       if (mockDate instanceof Date) {
         currentTime = mockDate.getTime();
       } else {
-        currentTime = global.Date.now();
+        currentTime = GlobalDate.now();
       }
+
+      global.Date = FakeDate;
     };
 
     self.tick = function(millis) {
@@ -23,35 +27,34 @@ getJasmineRequireObj().MockDate = function() {
       currentTime = currentTime + millis;
     };
 
-    self.reset = function() {
+    self.uninstall = function() {
       currentTime = 0;
+      global.Date = GlobalDate;
     };
 
-    self.Date = FakeDate;
-
     createDateProperties();
 
     return self;
 
     function FakeDate() {
       if (arguments.length === 0) {
-        return new global.Date(currentTime);
+        return new GlobalDate(currentTime);
       } else {
-        return global.Date.apply(this, arguments);
+        return new GlobalDate(arguments[0], arguments[1], arguments[2],
+          arguments[3], arguments[4], arguments[5], arguments[6]);
       }
-	  }
+    }
 
     function createDateProperties() {
-      FakeDate.prototype = global.Date.prototype;
 
       FakeDate.now = function() {
         return currentTime;
-      }
+      };
 
-      FakeDate.toSource = global.Date.toSource;
-      FakeDate.toString = global.Date.toString;
-      FakeDate.parse = global.Date.parse;
-      FakeDate.UTC = global.Date.UTC;
+      FakeDate.toSource = GlobalDate.toSource;
+      FakeDate.toString = GlobalDate.toString;
+      FakeDate.parse = GlobalDate.parse;
+      FakeDate.UTC = GlobalDate.UTC;
     }
 	}