Save and Restore the $_POST variable in tests that manipulate it so

other tests don't fail unexpectedly

core/tests/Albums_Controller_Test.php

@@ -18,8 +18,12 @@
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
  */
 class Albums_Controller_Test extends Unit_Test_Case {
+  public function setup() {
+    $this->_post = $_POST;
+  }
+
   public function teardown() {
-    unset($_POST);
+    $_POST = $this->_post;
   }
 
   public function change_album_test() {

core/tests/Photos_Controller_Test.php

@@ -18,8 +18,12 @@
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
  */
 class Photos_Controller_Test extends Unit_Test_Case {
+  public function setup() {
+    $this->_post = $_POST;
+  }
+
   public function teardown() {
-    unset($_POST);
+    $_POST = $this->_post;
   }
 
   public function change_photo_test() {

core/tests/REST_Controller_Test.php

@@ -19,11 +19,16 @@
  */
 class REST_Controller_Test extends Unit_Test_Case {
   public function setup() {
+    $this->_post = $_POST;
     $this->mock_controller = new Mock_RESTful_Controller("mock");
     $this->mock_not_loaded_controller = new Mock_RESTful_Controller("mock_not_loaded");
     $_POST = array();
   }
 
+  public function teardown() {
+    $_POST = $this->_post;
+  }
+
   public function dispatch_index_test() {
     $_SERVER["REQUEST_METHOD"] = "GET";
     $_POST["_method"] = "";

core/tests/REST_Helper_Test.php

@@ -18,6 +18,14 @@
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
  */
 class REST_Helper_Test extends Unit_Test_Case {
+  public function setup() {
+    $this->_post = $_POST;
+  }
+
+  public function teardown() {
+    $_POST = $this->_post;
+  }
+
   public function request_method_test() {
     foreach (array("GET", "POST") as $method) {
       foreach (array("", "PUT", "DELETE") as $tunnel) {