Allow linked media posts (#544)

Author: Zabuzard

application/src/main/java/org/togetherjava/tjbot/commands/mediaonly/MediaOnlyChannelListener.java

@@ -46,7 +46,8 @@ public void onMessageReceived(MessageReceivedEvent event) {
 
     private static boolean messageHasNoMediaAttached(MessageReceivedEvent event) {
         Message message = event.getMessage();
-        return message.getAttachments().isEmpty() && message.getEmbeds().isEmpty();
+        return message.getAttachments().isEmpty() && message.getEmbeds().isEmpty()
+                && !message.getContentRaw().contains("http");
     }
 
     @Nonnull

application/src/test/java/org/togetherjava/tjbot/commands/mediaonly/MediaOnlyChannelListenerTest.java

@@ -66,7 +66,20 @@ void keepsMessageWithAttachment() {
 
         // THEN it does not get deleted
         verify(event.getMessage(), never()).delete();
+    }
+
+    @Test
+    void keepsMessageWithLinkedMedia() {
+        // GIVEN a message with media linked in the message
+        Message message = new MessageBuilder()
+            .setContent("Check out this cute cat https://i.imgur.com/HLFByUJ.png")
+            .build();
+
+        // WHEN sending the message
+        MessageReceivedEvent event = sendMessage(message);
 
+        // THEN it does not get deleted
+        verify(event.getMessage(), never()).delete();
     }
 
     @Test