diff --git a/src/TextOutput.java b/src/TextOutput.java
index 4b5c46e..c52739a 100644
--- a/src/TextOutput.java
+++ b/src/TextOutput.java
@@ -130,4 +130,11 @@ public class TextOutput {
     public void errorInvalidCommand() {
         System.err.println("Invalid Command");
     }
+
+    /**
+     * Method to give out the Error "Invalid Input".
+     */
+    public void invalidInput() {
+        System.err.println("Invalid Input");
+    }
 }
diff --git a/test/TextOutputTest.java b/test/TextOutputTest.java
index 57bb624..17d72b9 100644
--- a/test/TextOutputTest.java
+++ b/test/TextOutputTest.java
@@ -17,7 +17,7 @@ class TextOutputTest {
         text.add("Virtute praecedunt, quod fere cotidianis proeliis cum Germanis contendunt, septentr ionesimmensoslongusw ordos.");
         text.add("Virtutedasjdhashdkjhakjdhakdshjkashd praecedunt, quod fere cotidianis proeliis cum");
         //text.add("ordos.");
-        //text.add("1234");
+        text.add("1234");
         text.add("12417575147517845 445264565");
         text.add("    ");
         //text.add("1eeeeeee8597389751");