// Exceptions
    // ------------------------------------------------------------------------

    public boolean hasExceptions() {
        return exceptions != null && !exceptions.isEmpty();
    }

    public List<Exception> getExceptions() {
        return exceptions == null ? Collections.emptyList() : Collections.unmodifiableList(exceptions);
    }

    // Exceptions
    // ------------------------------------------------------------------------

    public boolean hasExceptions() {
        return exceptions != null && !exceptions.isEmpty();
    }

    public List<Exception> getExceptions() {
        return exceptions == null ? Collections.emptyList() : Collections.unmodifiableList(exceptions);
    }

        assertTrue(endLatch.await(30, TimeUnit.SECONDS), "All threads should complete within timeout");
        executor.shutdown();

        // Then - Verify no exceptions occurred
        if (!exceptions.isEmpty()) {
            fail("Concurrent operations caused exceptions: " + exceptions.get(0));
        }

        assertEquals(threadCount * opsPerThread, successCount.get(), "All operations should succeed");
    }

    /**

        System.out.printf("  Avg tree operation time: %.2f ns%n", avgOpTimeNs);

        // Verify thread safety and performance
        assertTrue(exceptions.isEmpty(), "No exceptions should occur with thread-safe collections: " + exceptions);
        assertEquals(threadCount * operationsPerThread, treeOperations.get());
        assertTrue(avgOpTimeNs < 100000, "Tree operations should be reasonable with CopyOnWriteArrayList");

    }
    return Collections.unmodifiableList(causes);
  }

  /**
   * Returns {@code throwable}'s cause, cast to {@code expectedCauseType}.
   *
   * <p>Prefer this method instead of manually casting an exception's cause. For example, {@code
   * (IOException) e.getCause()} throws a {@link ClassCastException} that discards the original
   * exception {@code e} if the cause is not an {@link IOException}, but {@code

    }

    /**
     * Formats message out of problems: problems are sorted (in natural order of {@link BuilderProblem.Severity})
     * and then a list is built. These exceptions are usually thrown in "fatal" cases (and usually prevent Maven
     * from starting), and these exceptions may end up very early on output.
     *
     * @param message the base message to enhance
     * @param problems the collection of problems to include in the message

                        successCount.incrementAndGet();
                    }
                } catch (Exception e) {
                    synchronized (exceptions) {
                        exceptions.add(e);
                    }
                } finally {
                    endLatch.countDown();
                }
            });
        }

        // Start all threads

        if (suppressThrows) {
          logger.log(Level.INFO, "exception thrown during tearDown", t);
        } else {
          exceptions.add(t);
        }
      }
    }
    if (!suppressThrows && (exceptions.size() > 0)) {
      throw ClusterException.create(exceptions);
    }
  }

        if (suppressThrows) {
          logger.log(Level.INFO, "exception thrown during tearDown", t);
        } else {
          exceptions.add(t);
        }
      }
    }
    if (!suppressThrows && (exceptions.size() > 0)) {
      throw ClusterException.create(exceptions);
    }
  }

        try {
            ThreadDumpUtil.printThreadDump();
        } catch (Exception e) {
            fail("printThreadDump() should not throw exceptions: " + e.getMessage());
        }
    }

    public void test_printThreadDumpAsWarn() {
        // This test verifies that printThreadDumpAsWarn() method exists and can be called without exceptions
        try {