diff --git a/src/test/java/ChatGUITest.java b/src/test/java/ChatGUITest.java
index 8b06bf4..94a4fc2 100644
--- a/src/test/java/ChatGUITest.java
+++ b/src/test/java/ChatGUITest.java
@@ -41,6 +41,12 @@ public class ChatGUITest {
         Font expectedFont = chatGUI.outputTextArea.getFont().deriveFont(Font.PLAIN, 12);
         assertEquals(expectedFont, chatGUI.outputTextArea.getFont());
     }
+    @Test
+    public void testSetOutputTextFontSizeMedium() {
+        chatGUI.actionPerformed(new TestActionEvent(chatGUI.medium));
+        Font expectedFont = chatGUI.outputTextArea.getFont().deriveFont(Font.PLAIN, 16);
+        assertEquals(expectedFont, chatGUI.outputTextArea.getFont());
+    }
 
 }