Added tests to disprove TreeBehavior can generate warning. Closes #5975.

git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@8007 3807eeeb-6ff5-0310-8944-8be069107fe0

cake/tests/cases/libs/model/behaviors/tree.test.php

@@ -338,6 +338,25 @@ function testAddInvalid() {
 		$validTree = $this->Tree->verify();
 		$this->assertIdentical($validTree, true);
 	}
+/**
+ * testAddNotIndexedByModel method
+ *
+ * @access public
+ * @return void
+ */
+	function testAddNotIndexedByModel() {
+		extract($this->settings);
+		$this->Tree =& new $modelClass();
+		$this->Tree->initialize(2, 2);
+
+		$this->Tree->save(array('name' => 'testAddNotIndexed', $parentField => null));
+		$result = $this->Tree->find(null, array('name', $parentField), $modelClass . '.' . $leftField . ' desc');
+		$expected = array($modelClass => array('name' => 'testAddNotIndexed', $parentField => null));
+		$this->assertEqual($result, $expected);
+
+		$validTree = $this->Tree->verify();
+		$this->assertIdentical($validTree, true);
+}
 /**
  * testMovePromote method
  *