added Configuration Menu no Exit after wrong Input

src/main/java/Vault.java

@@ -34,7 +34,6 @@ public class Vault implements VaultInterface {
 
         if (input.equals("e")) {
             config = false;
-            
         }
 
     }

src/test/java/VaultTest.java

@@ -55,6 +55,20 @@ public class VaultTest {
         assertFalse(vlt.config);
     }
 
+    @Test
+    void doNotExitConfigAfterWrongInput() {
+        vlt.inputS = new ByteArrayInputStream("__\n".getBytes(StandardCharsets.UTF_8));
+        vlt.configure();
+        assertTrue(vlt.config);
+
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        vlt.inputS = getEmptyStringInputStream();
+        vlt.outputS = outputStream;
+
+        assertThrowsExactly(NoSuchElementException.class, () -> vlt.configure());
+        assertTrue(outputStream.toString().startsWith("Configure:"));
+    }
+
 
 
     private ByteArrayInputStream getEmptyStringInputStream() {