diff --git a/src/main/java/PasswordManager.java b/src/main/java/PasswordManager.java
index 8c8b7dd..4db3fd7 100644
--- a/src/main/java/PasswordManager.java
+++ b/src/main/java/PasswordManager.java
@@ -14,7 +14,7 @@ public class PasswordManager implements PasswordManagerInterface {
         PasswordManager pm = new PasswordManager();
 
         while (pm.running) {
-            pm.showMenu(null, null);
+            pm.showMenu();
         }
         System.exit(0);
     }
@@ -29,7 +29,11 @@ public class PasswordManager implements PasswordManagerInterface {
 
     @Override
     public void listVaults() {
-
+        try {
+            outputStream.write("Vaults:\n".getBytes(StandardCharsets.UTF_8));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
@@ -38,14 +42,7 @@ public class PasswordManager implements PasswordManagerInterface {
     }
 
     @Override
-    public void showMenu(InputStream inputStream, OutputStream outputStream) {
-        if (inputStream == null) {
-            inputStream = this.inputStream;
-        }
-        if (outputStream == null) {
-            outputStream = this.outputStream;
-        }
-
+    public void showMenu() {
         StringBuilder sb = new StringBuilder();
         Scanner scan = new Scanner(inputStream);
         running = true;
@@ -53,6 +50,7 @@ public class PasswordManager implements PasswordManagerInterface {
         sb.append("ciip Gruppe 8 - Password Manager\n\n");
 
         sb.append("Menu:\n");
+        sb.append("- list vaults: l:\n");
         sb.append("- exit: e\n");
 
         try {
@@ -65,6 +63,8 @@ public class PasswordManager implements PasswordManagerInterface {
 
         if (input.equals("e")) {
             running = false;
+        } else if (input.equals("l")) {
+            listVaults();
         }
     }
 }
diff --git a/src/main/java/PasswordManagerInterface.java b/src/main/java/PasswordManagerInterface.java
index da179e3..b7a7616 100644
--- a/src/main/java/PasswordManagerInterface.java
+++ b/src/main/java/PasswordManagerInterface.java
@@ -6,5 +6,5 @@ public interface PasswordManagerInterface {
     };
     public void listVaults();
     public void openVault();
-    public void showMenu(InputStream inputStream, OutputStream outputStream);
+    public void showMenu();
 }
diff --git a/src/test/java/PasswordManagerTest.java b/src/test/java/PasswordManagerTest.java
index 8125195..d811272 100644
--- a/src/test/java/PasswordManagerTest.java
+++ b/src/test/java/PasswordManagerTest.java
@@ -1,7 +1,9 @@
 import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.NoSuchElementException;
 
@@ -17,6 +19,12 @@ class PasswordManagerTest {
         pm = new PasswordManager();
     }
 
+    @BeforeEach
+    void reset() {
+        pm.outputStream = System.out;
+        pm.inputStream = System.in;
+    }
+
     @Test
     void constructor() {
         assertInstanceOf(PasswordManager.class, pm);
@@ -32,26 +40,42 @@ class PasswordManagerTest {
         pm.openVault();
     }
 
+    @Test
+    void menuNavigationListVaults() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        pm.inputStream = new ByteArrayInputStream("l\n".getBytes(StandardCharsets.UTF_8));
+        pm.outputStream = outputStream;
+        pm.showMenu();
+        assertTrue(outputStream.toString().endsWith("Vaults:\n"));
+    }
+
     @Test
     void showMenu() {
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu(getEmptyStringInputStream(), outputStream));
+        pm.inputStream = getEmptyStringInputStream();
+        pm.outputStream = outputStream;
+        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
         assertTrue(outputStream.toString().startsWith("ciip Gruppe 8"));
     }
 
     @Test
     void exitMenu() {
-        pm.showMenu(new ByteArrayInputStream("e\n".getBytes(StandardCharsets.UTF_8)), System.out);
+        pm.inputStream = new ByteArrayInputStream("e\n".getBytes(StandardCharsets.UTF_8));
+        pm.showMenu();
         assertFalse(pm.running);
     }
 
     @Test
     void doNotExitMenuAfterWrongInput() {
-        pm.showMenu(new ByteArrayInputStream("__\n".getBytes(StandardCharsets.UTF_8)), System.out);
+        pm.inputStream = new ByteArrayInputStream("__\n".getBytes(StandardCharsets.UTF_8));
+        pm.showMenu();
         assertTrue(pm.running);
 
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu(getEmptyStringInputStream(), outputStream));
+        pm.inputStream = getEmptyStringInputStream();
+        pm.outputStream = outputStream;
+
+        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
         assertTrue(outputStream.toString().startsWith("ciip Gruppe 8"));
     }