### Question:
Message { public byte[] encodeBase64() { try { return Base64.getEncoder().encode(this.getBytes()); } catch (Exception exp) { logError(MODULE_NAME, "Error in encodeBase64", new AgentSystemException(exp.getMessage(), exp)); return new byte[] {}; } } 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 testEncodeBase64() { assertNotNull(message.encodeBase64()); }
@Test public void throwsExceptionWhenEncodeBase64() { mockStatic(Base64.class); Base64.Encoder encoder = mock(Base64.Encoder.class); when(Base64.getEncoder()).thenReturn(encoder); PowerMockito.doThrow(new RuntimeException()).when(encoder).encode( any(byte[].class)); message.encodeBase64(); verifyStatic(LoggingService.class); LoggingService.logError(eq(MODULE_NAME), eq("Error in encodeBase64"), any()); }