### Question:
ErrorResponse extends PGMessage { public static ErrorResponse loadFromPacket(byte[] packet) { PGProto proto = new PGProto(packet, 5); Map<Byte, String> fieldWithValue = new LinkedHashMap<>(); while (proto.hasRemaining()) { byte field = proto.readByte(); if (field != 0x00) { fieldWithValue.put(field, proto.readNullStr()); } } return new ErrorResponse(fieldWithValue); } ErrorResponse(Severity severity, String sqlState, String message, String file,
        String line, String routine);  ErrorResponse(Severity severity, String sqlState, String message);  ErrorResponse(String sqlState, String message); private  ErrorResponse(Map<Byte, String> fieldWithValue); void addField(byte field, String value); void addField(Map<Byte, String> fieldWithValue); Severity getSeverity(); String getSqlState(); String getMessage(); String getFile(); String getLine(); Map<Byte, String> getFieldWithValue(); static ErrorResponse loadFromPacket(byte[] packet); static ErrorResponse buildErrorResponse(Severity severity, String sqlState,
        String message, String file, String line, String routine); static ErrorResponse buildErrorResponse(Severity severity, String sqlState,
        String message); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testLoadFromPacket() throws Exception { ErrorResponse errorResponse = ErrorResponse.loadFromPacket(packet); Map<Byte, String> expected = new LinkedHashMap<>(); expected.put((byte) 'S', "ERROR"); expected.put((byte) 'V', "ERROR"); expected.put((byte) 'C', "42P01"); expected.put((byte) 'M', "relation \"daltestdb\" does not exist"); expected.put((byte) 'P', "17"); expected.put((byte) 'F', "parse_relation.c"); expected.put((byte) 'L', "1159"); expected.put((byte) 'R', "parserOpenTable"); assertEquals(errorResponse.getFieldWithValue(), expected); }