Why is a #SpringBootTest unable to auto wire a #TestComponent? - spring

Question

I have an integration test with a dependency on a test component:
#SpringBootTest
public class CarRepositoryTest {
#Autowired
private SessionRepository sessionRepository;
#Autowired
private CarTestHelper carTestHelper;
#Autowired
private Login login;
#Test
public void testReportData() throws SQLException {
// calls a stored procedure without txn
sessionRepository.getSession(login.getUser(), login.getPassword());
LocalDate july5Of2016 = LocalDate.of(2016, 7, 5);
byte[] reportData = carTestHelper.getCarData("VIN1234", july5Of2016)
assertThat(reportData, notNullValue());
assertThat(reportData.length, lessThanOrEqualTo(Integer.MAX_VALUE));
}
Here's the #TestComponent that is not found by Spring (in the same package):
#TestComponent
#RequiredArgsConstructor
#Slf4j
public class CarTestHelper {
private final CarRepository carRepository;
//MUST DO THIS HERE b/c #SpringBootTest ignores Propagation.NEVER on #Test method
#Transactional(propagation = Propagation.NEVER, transactionManager ="carTransactionManager")
public byte[] getCarData(String vin, LocalDate date) throws SQLException {
Blob reportData = carRepository.getReportData(vin, date);
byte[] reportDataBytes = reportData.getBytes(1, (int) reportData.length());
StringBuilder sb = new StringBuilder();
for (byte a : reportDataBytes) {
sb.append(String.format("%02X ", a));
}
log.debug("Number of bytes: " + reportDataBytes.length);
log.debug("Number of bytes: " + reportData.length());
return reportDataBytes;
}
}