for (StackTraceElement element : stack) {
            String className = element.getClassName();
            if (className.startsWith("jcifs.smb") && !className.contains("Exception")) {
                return element.getMethodName();
            }
        }
        return "unknown";
    }

    private long extractNtStatus(Throwable cause) {
        if (cause instanceof SmbException) {

        for (int i = s; i < e; i++) {
            final StackTraceElement se = stackTrace[i];

            if (i == s && SmbTreeImpl.class.getName().equals(se.getClassName()) && "close".equals(se.getMethodName())) {
                s++;
                continue;
            }

            if (se.getClassName().startsWith("org.junit.runners.")) {
                e = i - 4;
                break;
            }

        StackTraceElement firstElement = stackTrace[0];
        assertEquals(this.getClass().getName(), firstElement.getClassName());
        assertEquals("test_stackTrace", firstElement.getMethodName());
    }

    /**
     * Test stack trace with cause
     */
    public void test_stackTraceWithCause() {
        Exception cause = new IllegalArgumentException("Cause exception");