Allow 1 second of slip.

lib/Cake/Test/Case/Model/Datasource/Session/DatabaseSessionTest.php

@@ -125,10 +125,14 @@ class DatabaseSessionTest extends CakeTestCase {
 			'Session' => array(
 				'id' => 'foo',
 				'data' => 'Some value',
-				'expires' => time() + (Configure::read('Session.timeout') * 60)
 			)
 		);
+		$expires = $result['Session']['expires'];
+		unset($result['Session']['expires']);
 		$this->assertEquals($expected, $result);
+
+		$expected = time() + (Configure::read('Session.timeout') * 60);
+		$this->assertWithinMargin($expires, $expected, 1);
 	}
 
 /**