implement creating a new vault

src/main/java/PasswordManager.java

@@ -12,6 +12,7 @@ public class PasswordManager implements PasswordManagerInterface {
     boolean running = true;
     InputStream inputStream = System.in;
     OutputStream outputStream = System.out;
+    ArrayList<Vault> vaults = new ArrayList<>();
 
     public static void main(String[] args) {
         PasswordManager pm = new PasswordManager();
@@ -26,11 +27,6 @@ public class PasswordManager implements PasswordManagerInterface {
         println("Hello World");
     }
 
-    @Override
-    public void listVaults() {
-        println("Vaults:");
-    }
-
     private void println(String output) {
         try {
             outputStream.write((output + "\n").getBytes(StandardCharsets.UTF_8));
@@ -39,6 +35,15 @@ public class PasswordManager implements PasswordManagerInterface {
         }
     }
 
+    @Override
+    public void listVaults() {
+        println("Vaults:");
+    }
+
+    public void createNewVault() {
+        vaults.add(new Vault());
+    }
+
     @Override
     public void openVault() {
 

src/test/java/PasswordManagerTest.java

@@ -88,6 +88,13 @@ class PasswordManagerTest {
         assertTrue(outputStream.toString().startsWith("\nciip Gruppe 8"));
     }
 
+    @Test
+    void createNewVault() {
+        assertEquals(0, pm.vaults.size());
+        pm.createNewVault();
+        assertEquals(1, pm.vaults.size());
+    }
+
     private ByteArrayInputStream getEmptyStringInputStream() {
         return new ByteArrayInputStream("".getBytes(StandardCharsets.UTF_8));
     }