/** * Tests the is_empty() function. */ public function test_is_empty() { // Tree with nothing in should be empty. $structure = tree::get_root_json(array(), tree::OP_OR); $tree = new tree($structure); $this->assertTrue($tree->is_empty()); // Tree with something in is not empty. $structure = tree::get_root_json(array(self::mock(array('m' => '1'))), tree::OP_OR); $tree = new tree($structure); $this->assertFalse($tree->is_empty()); }