diff --git a/src/WorkerF/Http/Route.php b/src/WorkerF/Http/Route.php
index bc8ac4e..fde8526 100644
--- a/src/WorkerF/Http/Route.php
+++ b/src/WorkerF/Http/Route.php
@@ -234,12 +234,10 @@ protected static function _variablePathParse($path, $method)
      */
     protected static function _variableRouteCacheControl($value)
     {
-        // get route cache index count
-        $count = count(self::$_variable_route_cache_index);
         // is value in cache index list?
         if (FALSE !== ($index = array_search($value, self::$_variable_route_cache_index))) {
             // if value is tail, do nothing
-            if ($index == ($count - 1)) {
+            if ($index == (count(self::$_variable_route_cache_index) - 1)) {
                 return;
             }
             // unset old value
@@ -247,15 +245,15 @@ protected static function _variableRouteCacheControl($value)
             // reset array index
             self::$_variable_route_cache_index = array_values(self::$_variable_route_cache_index);
         } 
+        // push value to tail
+        array_push(self::$_variable_route_cache_index, $value);
         // cache index list out of range? 
-        if ($count >= self::$_variable_route_cache_limit) {
+        if (count(self::$_variable_route_cache_index) > self::$_variable_route_cache_limit) {
             // remove head value
             $remove_value = array_shift(self::$_variable_route_cache_index);
             // unset route cache, free memory
             unset(self::$_variable_route_cache[$remove_value]);
-        } 
-        // push value to tail
-        array_push(self::$_variable_route_cache_index, $value);
+        }   
     }
 
     /**
diff --git a/tests/Http/RouteTest.php b/tests/Http/RouteTest.php
index ae40f0f..24188b6 100644
--- a/tests/Http/RouteTest.php
+++ b/tests/Http/RouteTest.php
@@ -41,6 +41,11 @@ public static function getVariableRouteCacheIndex()
         return self::$_variable_route_cache_index;
     }
 
+    public static function setVariableRouteCacheIndex($arr)
+    {
+        self::$_variable_route_cache_index = $arr;
+    }
+
     public static function getVariableRouteCacheLimit()
     {
         return self::$_variable_route_cache_limit;
@@ -644,33 +649,53 @@ public function testVariableCache()
 
     public function testVariableRouteCacheControl()
     {
-        // // data not out of range
-        // $route_cache = [];
-
-        // for ($i=0; $i < 65535; $i++) { 
-        //     $route_cache[$i] = 1;
-        // }
-
-        // RouteFake::setVariableRouteCache($route_cache);
-        // RouteFake::clearVariableRouteCache();
-
-        // $route_cache = RouteFake::getVariableRouteCache();
-        
-        // $this->assertEquals(65535, count($route_cache));
-
-        // // data out of range
-        // $route_cache = [];
-
-        // for ($i=0; $i < 65536; $i++) { 
-        //     $route_cache[$i] = 1;
-        // }
-
-        // RouteFake::setVariableRouteCache($route_cache);
-        // RouteFake::clearVariableRouteCache();
-
-        // $route_cache = RouteFake::getVariableRouteCache();
-        
-        // $this->assertEquals(0, count($route_cache));
+        // set cache limit
+        RouteFake::setVariableRouteCacheLimit(10);
+
+        /* data not out of range */
+
+        $route_cache_index = [9, 1, 5, 6, 7, 2];
+        RouteFake::setVariableRouteCacheIndex($route_cache_index);
+        RouteFake::setVariableRouteCache([9 => 'a', 7 => 'c', 1 => 'b']);
+
+        // value add
+        RouteFake::variableRouteCacheControl(15); 
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $this->assertEquals([9, 1, 5, 6, 7, 2, 15], $route_cache_index);
+
+        // value hit
+        RouteFake::variableRouteCacheControl(1);
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $this->assertEquals([9, 5, 6, 7, 2, 15, 1], $route_cache_index);
+        RouteFake::variableRouteCacheControl(7);
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $this->assertEquals([9, 5, 6, 2, 15, 1, 7], $route_cache_index);
+        $route_cache = RouteFake::getVariableRouteCache();
+        $this->assertEquals([9 => 'a', 7 => 'c', 1 => 'b'], $route_cache);
+
+        /* data out of range */
+
+        $route_cache_index = [9, 1, 5, 6, 7, 2, 11, 3, 15, 4];
+        RouteFake::setVariableRouteCacheIndex($route_cache_index);
+        RouteFake::setVariableRouteCache([9 => 'a', 7 => 'c', 1 => 'b']);
+
+        // value add
+        RouteFake::variableRouteCacheControl(18); 
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $route_cache = RouteFake::getVariableRouteCache();
+        $this->assertEquals([1, 5, 6, 7, 2, 11, 3, 15, 4, 18], $route_cache_index);
+        $this->assertEquals([7 => 'c', 1 => 'b'], $route_cache);
+        RouteFake::variableRouteCacheControl(16); 
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $route_cache = RouteFake::getVariableRouteCache();
+        $this->assertEquals([5, 6, 7, 2, 11, 3, 15, 4, 18, 16], $route_cache_index);
+        $this->assertEquals([7 => 'c'], $route_cache);
+
+        // value hit
+        RouteFake::variableRouteCacheControl(2);
+        $route_cache_index = RouteFake::getVariableRouteCacheIndex();
+        $this->assertEquals([5, 6, 7, 11, 3, 15, 4, 18, 16, 2], $route_cache_index);
+        $this->assertEquals([7 => 'c'], $route_cache);
     }
 
     public function testSetVariableRouteCacheLimit()