Sequence not available when using Spring and Testcontainers - postgresql

Question

I am trying to use postgres in a testcontainer for integration tests and it throws an error during JUnit execution due to a missing sequence.
I've tried not specifying the generator but it fails with hiberate_sequence not found. This works (named generators) in production so I'm pretty sure it is not a simple syntax issue.
Any suggestions on what could be causing the error?
Update
I created a new test without Testcontainers that uses an existing database with the table and generator already in the schema. That test is green. The SQL used to create the table and generator is the Spring generated SQL.
Environment: Spring Boot v2.7.8, postgres 12, testcontainers 1.17.6, JUnit 5, Java 11
Trivial example
#Builder(toBuilder = true)
#Entity
#Table(name = "motor")
public class MotorImpl implements Motor, Serializable {
private static final long serialVersionUID = -8719527647178838271L;
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "motor_generator")
#SequenceGenerator(name = "motor_generator", sequenceName = "motor_id_seq", allocationSize = 1)
private Long id;
#Version
private Integer version;
private String name;
// getters, setters, constructors generated by lombok
}
JUnit5 test class
#SpringBootTest
#Testcontainers
class MotorRepositoryTest {
#Container
private static final PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:12");
#DynamicPropertySource
static void registerPostgresProperties(DynamicPropertyRegistry registry) {
registry.add("spring.datasource.url", postgres::getJdbcUrl);
registry.add("spring.datasource.username", postgres::getUsername);
registry.add("spring.datasource.password", postgres::getPassword);
}
#Autowired
MotorRepository repo;
#Test
#Transactional
void givenValidMotor_whenInsert_thenRecordCreated() {
MotorImpl m = MotorImpl.builder().build();
MotorImpl m_saved = repo.save(m);
assertNotNull(m_saved.getId());
Optional<MotorImpl> m_retrieved = repo.findById(m_saved.getId());
assertTrue(m_retrieved.isPresent());
}
}
captured auto-DDL from Spring
create sequence motor_id_seq start 1 increment 1;
create table motor (
id int8 not null,
name varchar(255),
status int4,
version int4,
primary key (id)
);
console log
14:31:24.410 [main] INFO org.springframework.test.context.transaction.TransactionContext - Began transaction (1) for test context [DefaultTestContext#2681185e testClass = MotorRepositoryTest, testInstance = com.vogelware.testcontainer.motor.impl.MotorRepositoryTest#41f5389f, testMethod = givenValidMotor_whenInsert_thenRecordCreated#MotorRepositoryTest, testException = [null], mergedContextConfiguration = [MergedContextConfiguration#3a012678 testClass = MotorRepositoryTest, locations = '{}', classes = '{class com.vogelware.testcontainer.TestcontainerApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer#2c4d1ac, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer#41e68d87, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer#0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer#24ba9639, org.springframework.boot.test.autoconfigure.actuate.metrics.MetricsExportContextCustomizerFactory$DisableMetricExportContextCustomizer#4331d187, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer#0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer#335b5620, org.springframework.test.context.support.DynamicPropertiesContextCustomizer#513b5eb, org.springframework.boot.test.context.SpringBootTestArgs#1, org.springframework.boot.test.context.SpringBootTestWebEnvironment#3c153a1], contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.event.ApplicationEventsTestExecutionListener.recordApplicationEvents' -> false]]; transaction manager [org.springframework.orm.jpa.JpaTransactionManager#69cb134]; rollback [true]
14:31:24.562 [main] DEBUG org.hibernate.SQL -
select
nextval ('motor_id_seq')
14:31:24.573 [main] WARN org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 0, SQLState: 42P01
14:31:24.573 [main] ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper - ERROR: relation "motor_id_seq" does not exist
Position: 17