### Question:
XmlDecoder implements UaDecoder { @Override public Boolean decodeBoolean(String field) throws UaSerializationException { return parseElement(field, Boolean::valueOf); } XmlDecoder();  XmlDecoder(InputStream inputStream);  XmlDecoder(Reader reader); XmlDecoder setInput(InputStream inputStream); XmlDecoder setInput(Reader reader); @Override Boolean decodeBoolean(String field); @Override Byte decodeSByte(String field); @Override Short decodeInt16(String field); @Override Integer decodeInt32(String field); @Override Long decodeInt64(String field); @Override UByte decodeByte(String field); @Override UShort decodeUInt16(String field); @Override UInteger decodeUInt32(String field); @Override ULong decodeUInt64(String field); @Override Float decodeFloat(String field); @Override Double decodeDouble(String field); @Override String decodeString(String field); @Override DateTime decodeDateTime(String field); @Override UUID decodeGuid(String field); @Override ByteString decodeByteString(String field); @Override XmlElement decodeXmlElement(String field); @Override NodeId decodeNodeId(String field); @Override ExpandedNodeId decodeExpandedNodeId(String field); @Override StatusCode decodeStatusCode(String field); @Override QualifiedName decodeQualifiedName(String field); @Override LocalizedText decodeLocalizedText(String field); @Override ExtensionObject decodeExtensionObject(String field); @Override DataValue decodeDataValue(String field); @Override Variant decodeVariant(String field); Object decodeVariantValue(); @Override DiagnosticInfo decodeDiagnosticInfo(String field); @Override T decodeMessage(String field); @Override T decodeEnumeration(String field, Class<T> clazz); @Override T decodeSerializable(String field, Class<T> clazz); @Override T[] decodeArray(String field, Function<String, T> decoder, Class<T> clazz); @Override T[] decodeArray(String field, BiFunction<String, Class<T>, T> decoder, Class<T> clazz);  }### Answer:
@Test public void testDecodeBoolean() throws XMLStreamException { XmlDecoder decoder = new XmlDecoder(); decoder.setInput(new ByteArrayInputStream("<Value>true</Value>".getBytes())); assertTrue(decoder.decodeBoolean("Value")); decoder.setInput(new ByteArrayInputStream("<Value>false</Value>".getBytes())); assertFalse(decoder.decodeBoolean("Value")); decoder.setInput(new ByteArrayInputStream("<Value>true</Value>".getBytes())); assertTrue(decoder.decodeBoolean(null)); decoder.setInput(new ByteArrayInputStream("<Value>false</Value>".getBytes())); assertFalse(decoder.decodeBoolean(null)); }