Update regex for return path to allow for a single quote to be includ…

phpunit.xml.dist

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./tests/bootstrap.php" colors="true" beStrictAboutTestsThatDoNotTestAnything="false">
+<phpunit bootstrap="./tests/bootstrap.php" colors="true" beStrictAboutTestsThatDoNotTestAnything="false" cacheResult="false">
     <testsuites>
         <testsuite name="Zeta Components Mail">
             <directory suffix="_test.php">./tests</directory>

src/mail.php

@@ -133,7 +133,7 @@ class ezcMail extends ezcMailPart
     /**
      * Characters allowed in the returnPath address
      */
-    const RETURN_PATH_CHARS = 'A-Za-z0-9_.@=/+{}#~-';
+    const RETURN_PATH_CHARS = 'A-Za-z0-9_.@=/+{}#~\-\'';
 
     /**
      * Holds the options for this class.

tests/composer_test.php

@@ -33,7 +33,7 @@ class ezcMailComposerTest extends ezcTestCase
 {
     private $mail;
 
-	protected function setUp()
+	protected function setUp(): void
 	{
         $this->mail = new ezcMailComposer();
 	}

tests/interfaces/part_test.php

@@ -46,7 +46,7 @@ class ezcMailPartTest extends ezcTestCase
 {
     private $part;
 
-	protected function setUp()
+	protected function setUp(): void
 	{
         $this->part = new MailPartTest();
 	}

tests/mail_test.php

@@ -15,7 +15,7 @@ class ezcMailTest extends ezcTestCase
 {
     private $mail;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->mail = new ezcMail();
     }
@@ -507,6 +507,13 @@ public function testEmptyReturnPath()
         $this->assertNull( $mail->returnPath );
     }
 
+    public function testSingleQuoteReturnPath()
+    {
+        $mail = new ezcMail();
+        $mail->returnPath = new ezcMailAddress( 'TestEmailWith\'singlequote@example.com' );
+        $this->assertEquals( 'TestEmailWith\'singlequote@example.com', $mail->returnPath->email );
+    }
+
     public function testInvalidReturnPathChars()
     {
         $mail = new ezcMail();

tests/parts/multipart_test.php

@@ -55,7 +55,7 @@ class ezcMailMultipartTest extends ezcTestCase
 {
     private $multipart;
 
-	protected function setUp()
+	protected function setUp(): void
 	{
         $this->multipart = new TestMultipart();
 	}

tests/parts/text_part_test.php

@@ -16,7 +16,7 @@ class ezcMailTextTest extends ezcTestCase
 {
     private $part;
 
-	protected function setUp()
+	protected function setUp(): void
 	{
         $this->part = new ezcMailText( "dummy" );
 	}