// 2. Should have exactly one private constructor
        Constructor<?>[] constructors = WebApiUtil.class.getDeclaredConstructors();
        assertEquals("Should have exactly one constructor", 1, constructors.length);
        assertTrue("Constructor should be private", java.lang.reflect.Modifier.isPrivate(constructors[0].getModifiers()));

        // 3. All public methods should be static

        // Test List interface (should use get(0) for performance)
        List<BsUser> list = Arrays.asList(entity1, entity2);
        RenderDataUtil.register(data, "list", list);

        Object result = data.getDataMap().get("list");
        assertNotNull(result);
        assertTrue(result instanceof List);

        // Test Set interface (should use iterator().next())

  }

  private void expectReturnsTrue(Target target) {
    String message = Platform.format("retainAll(%s) should return true", target);
    assertTrue(message, collection.retainAll(target.toRetain));
  }

  private void expectReturnsFalse(Target target) {
    String message = Platform.format("retainAll(%s) should return false", target);
    assertFalse(message, collection.retainAll(target.toRetain));
  }

        TestFessSystemException exception = new TestFessSystemException(message, true, true);

        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());

        // Stack trace should be populated
        assertTrue(exception.getStackTrace().length > 0);
    }

    public void test_constructor_withNonWritableStackTrace() {
        // Test protected constructor with non-writable stack trace

    }

    public void test_register_with_null_scheduledJob() {
        try {
            jobHelper.register((ScheduledJob) null);
            fail("Should throw ScheduledJobException");
        } catch (ScheduledJobException e) {
            assertEquals("No job.", e.getMessage());
        } catch (Exception e) {

     */
    fun retry(): Plan?
  }

  /**
   * What to do once a plan has executed.
   *
   * If [nextPlan] is not-null, another attempt should be made by following it. If [throwable] is
   * non-null, it should be reported to the user should all further attempts fail.
   *
   * The two values are independent: results can contain both (recoverable error), neither

            fail("Should throw IllegalArgumentException for null engine");
        } catch (IllegalArgumentException e) {
            assertEquals("name or scriptEngine is null.", e.getMessage());
        }
    }

    // Test add method with both null parameters
    public void test_add_bothNull() {
        try {
            scriptEngineFactory.add(null, null);

            }
        };

        SystemHelper systemHelper = new SystemHelper() {
            @Override
            public boolean isChangedClusterState(int status) {
                // YELLOW status is 0, should not be changed
                return false;
            }

            @Override
            public String getHostname() {
                return "test-hostname";
            }
        };

    }

    // Test execute method with non-BooleanQuery (should throw exception)
    public void test_execute_withNonBooleanQuery() {
        TermQuery termQuery = new TermQuery(new Term("field", "value"));
        QueryContext context = new QueryContext("test", false);

        try {
            booleanQueryCommand.execute(context, termQuery, 1.0f);
            fail("Should throw InvalidQueryException");

  public void testPut_supportedPresent() {
    assertEquals("put(present, value) should return the old value", v0(), getMap().put(k0(), v3()));
    expectReplacement(entry(k0(), v3()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPut_supportedNotPresent() {
    assertNull("put(notPresent, value) should return null", put(e3()));
    expectAdded(e3());
  }