assertThrows(IllegalArgumentException.class, () -> {
            transformHeader.setNonce(longNonce);
        });
    }

    @Test
    @DisplayName("Should handle null signature")
    void testNullSignature() {
        // When/Then
        assertThrows(NullPointerException.class, () -> {
            transformHeader.setSignature(null);
        });
    }

    @Test