// Then
        assertNotNull(result);
        assertFalse(result.isEmpty());
        // Should contain hex representation of first bytes
        assertTrue(result.startsWith("00010203"));
        assertEquals(64, result.length()); // 32 bytes * 2 chars per byte
    }

    @ParameterizedTest
    @ValueSource(ints = { 1, 16, 32, 64, 128, 256 })
    @DisplayName("Should handle various data sizes")

        assertEquals("0001", Hexdump.toHexString(data1, 0, 4)); // 4 chars = 2 bytes
        assertEquals("000102", Hexdump.toHexString(data1, 0, 6)); // 6 chars = 3 bytes
        assertEquals("00010203", Hexdump.toHexString(data1, 0, 8)); // 8 chars = 4 bytes

        // Test with negative byte values
        byte[] data2 = { (byte) 0xFF, (byte) 0xFE, (byte) 0x80, 0x7F };

        assertEquals(0, new BigDecimal("0.0123").compareTo(BigDecimalConversionUtil.toBigDecimal(Double.valueOf(0.0123D))));
        assertEquals(0, new BigDecimal("0.00123").compareTo(BigDecimalConversionUtil.toBigDecimal(Double.valueOf(0.00123D))));
        assertEquals(0, new BigDecimal("0.000123").compareTo(BigDecimalConversionUtil.toBigDecimal(Double.valueOf(0.000123D))));

        assertEquals("abc", StringUtil.substringToLast("abc", "dddd"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToHex() throws Exception {
        assertEquals("010203", StringUtil.toHex(new byte[] { 1, 2, 3 }));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testToHex2() throws Exception {
        assertEquals("0001", StringUtil.toHex(1));

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