ByteTypeConverter implements TypeConverter<String, Byte> { @Override public Byte convert(final String value) { Utils.checkArgument(value != null, "Value to convert must not be null"); Utils.checkArgument(!value.isEmpty(), "Value to convert must not be empty"); return Double.valueOf(value).byteValue(); }  @Override Byte convert(final String value);  }
@Test public void whenInputIsLegalValue_ThenShouldReturnBigInteger() { assertThat(converter.convert("5")).isEqualTo((byte) 5); assertThat(converter.convert("5.0")).isEqualTo((byte) 5); }