builder = new DefaultMessageBuilder();
        format.formatRate(builder, 5500000000.0);
        assertEquals("5.5 GB/s", builder.build());
    }

    @Test
    void testFormatRateThresholds() {
        FileSizeFormat format = new FileSizeFormat();

        // Test value less than 0.05
        // Test exact unit thresholds
        MessageBuilder builder = new DefaultMessageBuilder();