### Question:
StringConverter implements Converter { @Override public byte[] fromConnectData(String topic, Schema schema, Object value) { try { return serializer.serialize(topic, value == null ? null : value.toString()); } catch (SerializationException e) { throw new DataException("Failed to serialize to a string: ", e); } } StringConverter(); @Override void configure(Map<String, ?> configs, boolean isKey); @Override byte[] fromConnectData(String topic, Schema schema, Object value); @Override SchemaAndValue toConnectData(String topic, byte[] value);  }### Answer:
@Test public void testStringToBytes() throws UnsupportedEncodingException { assertArrayEquals(SAMPLE_STRING.getBytes("UTF8"), converter.fromConnectData(TOPIC, Schema.STRING_SCHEMA, SAMPLE_STRING)); }
@Test public void testNonStringToBytes() throws UnsupportedEncodingException { assertArrayEquals("true".getBytes("UTF8"), converter.fromConnectData(TOPIC, Schema.BOOLEAN_SCHEMA, true)); }
@Test public void testNullToBytes() { assertEquals(null, converter.fromConnectData(TOPIC, Schema.OPTIONAL_STRING_SCHEMA, null)); }
@Test public void testToBytesIgnoresSchema() throws UnsupportedEncodingException { assertArrayEquals("true".getBytes("UTF8"), converter.fromConnectData(TOPIC, null, true)); }