diff --git a/profiles/VariableProfiles.php b/profiles/VariableProfiles.php
index 9b39856..7329efc 100644
--- a/profiles/VariableProfiles.php
+++ b/profiles/VariableProfiles.php
@@ -2,6 +2,7 @@
 
 class VariableProfiles implements IProfile {
     public function __construct() {
+        $this->null = null;
         $this->string = "foo";
         $this->bool   = true;
         $this->integer= 1234;
@@ -21,6 +22,14 @@ public function profileIsEmptyOnSimpleString() {
         empty($this->string);
     }
 
+    public function profileIsEmptyOnNullValue() {
+        empty($this->null);
+    }
+
+    public function profileIsNullOnNullValue() {
+        null == $this->null;
+    }
+
     /*
     public function profileIsEmptyOnBoolean() {
         empty($this->bool);