add aircraft throws exception mockito test

src/test/java/hs/fulda/de/ci/exam/project/AdminTest.java

@@ -126,4 +126,13 @@ public class AdminTest {
         }
         assertNotNull(admin.addAircraft("Boeing", "787", 2003));
     }
+
+    @Test
+    public void testAddAircraft_throwsException() throws IOException {
+
+        when(aircraftRepository.save(any(Aircraft.class))).thenThrow(IOException.class);
+        assertThrows(IOException.class, () -> {
+            admin.addAircraft("Boeing", "787", 2003);
+        });
+    }
 }