assertNotEquals(new String(plaintext), new String(encrypted));
    }

    @Test
    @DisplayName("Should perform DES encryption/decryption")
    void testDES() throws Exception {
        // Given
        byte[] key = "testkey1".getBytes(); // 8 bytes for DES
        byte[] plaintext = "12345678".getBytes(); // 8 bytes (DES block size)

        // When
        Cipher desCipher = Crypto.getDES(key);

    testers.add(ListHashCodeTester.class);
    testers.add(ListIndexOfTester.class);
    testers.add(ListLastIndexOfTester.class);
    testers.add(ListListIteratorTester.class);
    testers.add(ListRemoveAllTester.class);
    testers.add(ListRemoveAtIndexTester.class);
    testers.add(ListRemoveTester.class);
    testers.add(ListReplaceAllTester.class);
    testers.add(ListRetainAllTester.class);
    testers.add(ListSetTester.class);

import com.google.common.collect.testing.testers.CollectionForEachTester;
import com.google.common.collect.testing.testers.CollectionIsEmptyTester;
import com.google.common.collect.testing.testers.CollectionIteratorTester;
import com.google.common.collect.testing.testers.CollectionRemoveAllTester;
import com.google.common.collect.testing.testers.CollectionRemoveIfTester;

    testers.add(ListHashCodeTester.class);
    testers.add(ListIndexOfTester.class);
    testers.add(ListLastIndexOfTester.class);
    testers.add(ListListIteratorTester.class);
    testers.add(ListRemoveAllTester.class);
    testers.add(ListRemoveAtIndexTester.class);
    testers.add(ListRemoveTester.class);
    testers.add(ListRetainAllTester.class);
    testers.add(ListSetTester.class);
    testers.add(ListSubListTester.class);

    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());

    testers.add(CollectionSerializationEqualTester.class);
    testers.add(SetAddAllTester.class);
    testers.add(SetAddTester.class);
    testers.add(SetCreationTester.class);
    testers.add(SetHashCodeTester.class);
    testers.add(SetEqualsTester.class);
    testers.add(SetRemoveTester.class);

import com.google.common.collect.testing.testers.MapEntrySetTester;
import com.google.common.collect.testing.testers.MapEqualsTester;
import com.google.common.collect.testing.testers.MapForEachTester;
import com.google.common.collect.testing.testers.MapGetOrDefaultTester;
import com.google.common.collect.testing.testers.MapGetTester;
import com.google.common.collect.testing.testers.MapHashCodeTester;

            System.clearProperty(Constants.FESS_CONFIG_PREFIX + testKey);
        }
    }

    // Test caching mechanism
    @Test
    public void test_get_caching() {
        // Get property twice to test caching behavior
        String testKey = "domain.title";
        String value1 = fessConfig.get(testKey);
        String value2 = fessConfig.get(testKey);

        // Values should be the same

import com.google.common.collect.testing.testers.CollectionIsEmptyTester;
import com.google.common.collect.testing.testers.CollectionIteratorTester;
import com.google.common.collect.testing.testers.CollectionRemoveAllTester;
import com.google.common.collect.testing.testers.CollectionRemoveTester;
import com.google.common.collect.testing.testers.CollectionRetainAllTester;

    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.add(CollectionSerializationEqualTester.class);
    testers.add(MultisetAddTester.class);
    testers.add(MultisetContainsTester.class);
    testers.add(MultisetCountTester.class);
    testers.add(MultisetElementSetTester.class);
    testers.add(MultisetEqualsTester.class);
    testers.add(MultisetForEachEntryTester.class);

import static com.google.common.collect.testing.testers.CollectionAddAllTester.getAddAllUnsupportedNonePresentMethod;
import static com.google.common.collect.testing.testers.CollectionAddAllTester.getAddAllUnsupportedSomePresentMethod;
import static com.google.common.collect.testing.testers.CollectionAddTester.getAddUnsupportedNotPresentMethod;
import static com.google.common.collect.testing.testers.CollectionCreationTester.getCreateWithNullUnsupportedMethod;