### Question:
ByteSize implements Comparable<ByteSize> { @JsonValue @Override public String toString() { double value = getValue(displayUnit); String integer = String.format(Locale.ENGLISH, "%d", (long) value); String decimal = String.format(Locale.ENGLISH, "%.2f", value); if (decimal.equals(integer + ".00")) { return integer + displayUnit.getUnitString(); } else { return decimal + displayUnit.getUnitString(); } } ByteSize(double size, Unit unit); @JsonCreator  ByteSize(long bytes); long getBytes(); int getBytesInt(); long roundTo(Unit unit); double getValue(Unit unit); @JsonCreator static ByteSize parseByteSize(String size); @JsonValue @Override String toString(); @Override int compareTo(ByteSize o); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testToString() { assertByteSizeString("42B", "42 B"); assertByteSizeString("42KB", "42 KB"); assertByteSizeString("42MB", "42 MB"); assertByteSizeString("42GB", "42 GB"); assertByteSizeString("42TB", "42 TB"); assertByteSizeString("42PB", "42 PB"); assertByteSizeString("42.20KB", "42.2 KB"); assertByteSizeString("42.33KB", "42.33KB"); }