### Question:
Message { public JsonObject toJson() { return Json.createObjectBuilder() .add("id", id == null ? "" : id) .add("tag", tag == null ? "" : tag) .add("groupid", messageGroupId == null ? "" : messageGroupId) .add("sequencenumber", sequenceNumber) .add("sequencetotal", sequenceTotal) .add("priority", priority) .add("timestamp", timestamp) .add("publisher", publisher == null ? "" : publisher) .add("authid", authIdentifier == null ? "" : authIdentifier) .add("authgroup", authGroup == null ? "" : authGroup) .add("version", version) .add("chainposition", chainPosition) .add("hash", hash == null ? "" : hash) .add("previoushash", previousHash == null ? "" : previousHash) .add("nonce", nonce == null ? "" : nonce) .add("difficultytarget", difficultyTarget) .add("infotype", infoType == null ? "" : infoType) .add("infoformat", infoFormat == null ? "" : infoFormat) .add("contextdata", contextData == null ? "" : new String(Base64.getEncoder().encode(contextData))) .add("contentdata", contentData == null ? "" : new String(Base64.getEncoder().encode(contentData))) .build(); } Message();  Message(String publisher);  Message(JsonObject json);  Message(byte[] rawBytes);  Message(byte[] header, byte[] data); String getId(); void setId(String id); String getTag(); void setTag(String tag); String getMessageGroupId(); void setMessageGroupId(String messageGroupId); int getSequenceNumber(); void setSequenceNumber(int sequenceNumber); int getSequenceTotal(); void setSequenceTotal(int sequenceTotal); byte getPriority(); void setPriority(byte priority); long getTimestamp(); void setTimestamp(long timestamp); String getPublisher(); void setPublisher(String publisher); String getAuthIdentifier(); void setAuthIdentifier(String authIdentifier); String getAuthGroup(); void setAuthGroup(String authGroup); short getVersion(); long getChainPosition(); void setChainPosition(long chainPosition); String getHash(); void setHash(String hash); String getPreviousHash(); void setPreviousHash(String previousHash); String getNonce(); void setNonce(String nonce); int getDifficultyTarget(); void setDifficultyTarget(int difficultyTarget); String getInfoType(); void setInfoType(String infoType); String getInfoFormat(); void setInfoFormat(String infoFormat); byte[] getContextData(); void setContextData(byte[] contextData); byte[] getContentData(); void setContentData(byte[] contentData); byte[] getBytes(); @Override String toString(); void decodeBase64(byte[] bytes); JsonObject toJson(); byte[] encodeBase64();  }### Answer:
@Test public void testJsonWithMessageConstructorWithNoArguments() { assertTrue(message.toJson().containsKey("version")); assertTrue(message.toJson().containsKey("publisher")); assertTrue(message.toJson().containsKey("groupid")); assertEquals("", message.toJson().getString("groupid")); assertEquals(VERSION, message.toJson().getInt("version")); assertEquals("", message.toJson().getString("publisher")); assertEquals("", message.toJson().getString("infotype")); }
@Test public void testJsonWithMessageConstructorWithJsonArgument() { message = spy(new Message(jsonObject)); assertTrue(message.toJson().containsKey("version")); assertTrue(message.toJson().containsKey("publisher")); assertTrue(message.toJson().containsKey("groupid")); assertEquals(messageGroupId, message.toJson().getString("groupid")); assertEquals(version, message.toJson().getInt("version")); assertEquals(publisher, message.toJson().getString("publisher")); assertEquals(infoFormat, message.toJson().getString("infoformat")); assertEquals(previousHash, message.toJson().getString("previoushash")); assertEquals(hash, message.toJson().getString("hash")); }