Update tests to use assertContains

lib/Cake/Test/Case/Network/Email/CakeEmailTest.php

@@ -980,19 +980,19 @@ class CakeEmailTest extends CakeTestCase {
 		$this->CakeEmail->config(array());
 		$this->CakeEmail->attachments(array(CAKE . 'basics.php'));
 		$result = $this->CakeEmail->send('body');
-		$this->assertTrue((bool)strpos($result['message'], "Content-Type: application/octet-stream\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"basics.php\""));
+		$this->assertContains("Content-Type: application/octet-stream\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"basics.php\"", $result['message']);
 
 		$this->CakeEmail->attachments(array('my.file.txt' => CAKE . 'basics.php'));
 		$result = $this->CakeEmail->send('body');
-		$this->assertTrue((bool)strpos($result['message'], "Content-Type: application/octet-stream\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"my.file.txt\""));
+		$this->assertContains("Content-Type: application/octet-stream\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"my.file.txt\"", $result['message']);
 
 		$this->CakeEmail->attachments(array('file.txt' => array('file' => CAKE . 'basics.php', 'mimetype' => 'text/plain')));
 		$result = $this->CakeEmail->send('body');
-		$this->assertTrue((bool)strpos($result['message'], "Content-Type: text/plain\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"file.txt\""));
+		$this->assertContains("Content-Type: text/plain\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment; filename=\"file.txt\"", $result['message']);
 
 		$this->CakeEmail->attachments(array('file2.txt' => array('file' => CAKE . 'basics.php', 'mimetype' => 'text/plain', 'contentId' => 'a1b1c1')));
 		$result = $this->CakeEmail->send('body');
-		$this->assertTrue((bool)strpos($result['message'], "Content-Type: text/plain\r\nContent-Transfer-Encoding: base64\r\nContent-ID: <a1b1c1>\r\nContent-Disposition: inline; filename=\"file2.txt\""));
+		$this->assertContains("Content-Type: text/plain\r\nContent-Transfer-Encoding: base64\r\nContent-ID: <a1b1c1>\r\nContent-Disposition: inline; filename=\"file2.txt\"", $result['message']);
 	}
 
 /**