chain.updateThrowsException = true;
        User user = createTestUser("testuser", "Test User");

        try {
            chain.update(user);
            fail("Expected exception to be thrown");
        } catch (RuntimeException e) {
            assertEquals("Update failed", e.getMessage());
        }

        assertEquals(1, chain.updateCalls.size());
    }

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

            fail("setError should throw NullPointerException when passed null exception");
        } catch (NullPointerException e) {
            // Expected - WebApiException constructor cannot handle null exception
            assertTrue("Should get expected NPE message",
                    e.getMessage().contains("Cannot invoke \"java.lang.Exception.getMessage()\" because \"e\" is null"));
        }
    }

    @Test

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

        options.sessionId = "test-session";
        options.name = "test-name";
        options.propertiesPath = "/path/to/props";

        String expected = "Options [sessionId=test-session, name=test-name, propertiesPath=/path/to/props]";
        assertEquals(expected, options.toString());
    }

    // Test initializeProbes
    @Test
    public void test_initializeProbes() {
        try {

        try {
            result.getRelevantDocIds().add("newDoc");
            fail("DocIds list should be immutable");
        } catch (UnsupportedOperationException e) {
            // Expected
        }
    }

    @Test
    public void test_indexesAreImmutable() {
        List<String> docIds = Arrays.asList("doc1", "doc2");
        List<Integer> indexes = Arrays.asList(1, 2);

        try {
            authenticator.getParentGroup(null, "test-id", 4);
            // If we reach here without NullPointerException, depth check passed
        } catch (NullPointerException e) {
            // Expected due to null user - depth check passed, processing attempted
            assertTrue(true);
        } catch (Exception e) {
            // Other exceptions are also acceptable as we're testing depth logic