Added functions & test cases: deleteAccount and getAllAccounts

src/test/java/PrivateBankTest.java

@@ -429,4 +429,67 @@ public class PrivateBankTest {
                 AccountAlreadyExistsException.class, () -> privateBank.readAccounts()
         );
     }
+
+
+    @DisplayName("Delete existing account")
+    @Order(20)
+    @Test
+    public void testDeleteExistingAccount() {
+        assertDoesNotThrow(
+                () -> privateBank.createAccount(
+                        "Konto_X",
+                        List.of(
+                                new OutgoingTransfer(
+                                        "01.01.2000",
+                                        100,
+                                        "OutgoingTransfer to Hans",
+                                        "Konto_X",
+                                        "Hans"
+                                ),
+                                new IncomingTransfer(
+                                        "01.01.2000",
+                                        100,
+                                        "IncomingTransfer from Hans",
+                                        "Hans",
+                                        "Konto_X"
+                                ),
+                                new IncomingTransfer(
+                                        "01.01.2000",
+                                        300,
+                                        "IncomingTransfer from Tom",
+                                        "Tom",
+                                        "Konto_X"
+                                )
+
+                        )
+                )
+        );
+
+        assertDoesNotThrow(
+                () -> privateBank.writeAccount("Konto_X")
+        );
+
+        assertTrue(
+                () -> privateBank.containsAccount("Konto_X")
+        );
+
+        assertDoesNotThrow(
+                () -> privateBank.deleteAccount("Konto_X")
+        );
+
+        assertFalse(
+                () -> privateBank.containsAccount("Konto_X")
+        );
+
+    }
+
+    @DisplayName("Delete non existing account")
+    @Order(21)
+    @Test
+    public void testDeleteNonExistingAccount() {
+        assertThrows(
+                AccountDoesNotExistException.class, () -> privateBank.deleteAccount("Konto_X")
+        );
+    }
+
 }