fail("Should throw NullPointerException for null consumer");
        } catch (NullPointerException e) {
            // Expected behavior
        }
    }

    @Test
    public void test_processThreadDump_multipleThreads() {
        AtomicInteger threadCount = new AtomicInteger(0);
        AtomicInteger stackTraceCount = new AtomicInteger(0);

        Consumer<String> countingConsumer = line -> {