Merge pull request #227 from ddeboer/null_charset

If charset is not specified defaults to "us-ascii"
Close #226

src/Message/AbstractPart.php

@@ -172,7 +172,7 @@ final public function getParameters(): Parameters
      */
     final public function getCharset(): string
     {
-        return $this->parameters->get('charset');
+        return $this->parameters->get('charset') ?: 'us-ascii';
     }
 
     /**

tests/MessageTest.php

@@ -575,4 +575,23 @@ public function testSignedMessage()
             $this->assertContains($expectedContains, \rtrim($attachment->getContent()), $attachment->getFilename());
         }
     }
+
+    public function testSimpleMessageWithoutCharset()
+    {
+        $this->mailbox->addMessage($this->getFixture('without_charset_plain_only'));
+
+        $message = $this->mailbox->getMessage(1);
+
+        $this->assertSame('Hi', \rtrim($message->getBodyText()));
+    }
+
+    public function testMultipartMessageWithoutCharset()
+    {
+        $this->mailbox->addMessage($this->getFixture('without_charset_simple_multipart'));
+
+        $message = $this->mailbox->getMessage(1);
+
+        $this->assertSame('MyPlain', \rtrim($message->getBodyText()));
+        $this->assertSame('MyHtml', \rtrim($message->getBodyHtml()));
+    }
 }

tests/fixtures/without_charset_plain_only.eml

@@ -0,0 +1,8 @@
+From: [email protected]
+To: [email protected]
+Subject: Nuu
+Date: Wed, 13 Sep 2017 13:05:45 +0200
+Content-Type: text/plain; charset=
+Content-Transfer-Encoding: quoted-printable
+
+Hi

tests/fixtures/without_charset_simple_multipart.eml

@@ -0,0 +1,24 @@
+From: [email protected]
+To: [email protected]
+Date: Wed, 27 Sep 2017 12:48:51 +0200
+Subject: test
+Content-Type: multipart/alternative;
+	boundary="----=_NextPart_000_0081_01D32C91.033E7020"
+
+This is a multipart message in MIME format.
+
+------=_NextPart_000_0081_01D32C91.033E7020
+Content-Type: text/plain;
+	charset=
+Content-Transfer-Encoding: 7bit
+
+MyPlain
+
+------=_NextPart_000_0081_01D32C91.033E7020
+Content-Type: text/html;
+	charset=""
+Content-Transfer-Encoding: quoted-printable
+
+MyHtml
+------=_NextPart_000_0081_01D32C91.033E7020--
+