Add a test for an attachment with UTF-8 symbols

greenmail-core/src/test/java/com/icegreen/greenmail/specificmessages/EncodingTest.java

@@ -24,6 +24,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 
@@ -198,6 +199,55 @@ public void messagesAdded(MessageCountEvent e) {
         }
     }
 
+    @Test
+    public void testAttachmentWithUTF8NameAndGreenMailApi() throws MessagingException, IOException {
+        System.setProperty("mail.mime.decodefilename", "true");
+
+        greenMail.setUser("to@localhost", "pwd");
+        final IMAPStore store = greenMail.getImap().createStore();
+        store.connect("to@localhost", "pwd");
+        try {
+            Folder inboxFolder = store.getFolder("INBOX");
+            inboxFolder.open(Folder.READ_ONLY);
+            Message[] messages = new Message[] { null };
+            MessageCountListener listener = new MessageCountListener() {
+                @Override
+                public void messagesRemoved(MessageCountEvent e) {
+                }
+
+                @Override
+                public void messagesAdded(MessageCountEvent e) {
+                    messages[0] = e.getMessages()[0];
+                }
+            };
+            inboxFolder.addMessageCountListener(listener);
+            String fileName = "кирилица testimage_ünicöde_\uD83C\uDF36";
+            new Thread(() -> {
+                try {
+                    Thread.sleep(100);
+                } catch (InterruptedException e1) {
+                    // Ignore
+                }
+                try {
+                    GreenMailUtil.sendAttachmentEmail(
+                        "to@localhost", "from@localhost", "subject", "body",
+                        new byte[]{0, 1, 2}, "image/gif", MimeUtility.encodeText(fileName),
+                        "testimage_description", greenMail.getSmtp().getServerSetup());
+                } catch (UnsupportedEncodingException ex) {
+                    assertThat(false).isTrue();
+                }
+            }).start();
+            ((IMAPFolder) inboxFolder).idle(true);
+
+            assertThat(messages[0].getContent() != null).isTrue();
+            assertThat(((Multipart) messages[0].getContent()).getBodyPart(1).getFileName()).isEqualTo(fileName);
+
+            inboxFolder.close();
+        } finally {
+            store.close();
+        }
+    }
+
     private void sendMessage(InternetAddress fromAddress, InternetAddress toAddress) throws MessagingException {
         final Session session = greenMail.getSmtp().createSession();
         MimeMessage message = new MimeMessage(session);