Auto-configure JdbcTemplate with DataJpaTest

This commit adds `JdbcTemplateAutoConfiguration` to the list of auto-
configurations that are applied with `DataJpaTest`. This effectively
allows to inject a `JdbcTemplate` in any `@DataJpaTest` test.

Closes gh-6802

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -5204,7 +5204,8 @@ Data JPA tests may also inject a
 {sc-spring-boot-test-autoconfigure}/orm/jpa/TestEntityManager.{sc-ext}[`TestEntityManager`]
 bean which provides an alternative to the standard JPA `EntityManager` specifically
 designed for tests. If you want to use `TestEntityManager` outside of `@DataJpaTests` you
-can also use the `@AutoConfigureTestEntityManager` annotation.
+can also use the `@AutoConfigureTestEntityManager` annotation. A `JdbcTemplate` is also
+available should you need that.
 
 [source,java,indent=0]
 ----

spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -8,6 +8,7 @@ org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration
 org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\
 org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
 org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\
+org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\
 org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\
 org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
 org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/orm/jpa/DataJpaTestIntegrationTests.java

@@ -28,6 +28,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.context.ApplicationContext;
+import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -49,6 +50,9 @@ public class DataJpaTestIntegrationTests {
 	@Autowired
 	private TestEntityManager entities;
 
+	@Autowired
+	private JdbcTemplate jdbcTemplate;
+
 	@Autowired
 	private ExampleRepository repository;
 
@@ -72,6 +76,9 @@ public class DataJpaTestIntegrationTests {
 		Long id = this.entities.persistAndGetId(new ExampleEntity("spring", "123"),
 				Long.class);
 		assertThat(id).isNotNull();
+		String reference = this.jdbcTemplate.queryForObject(
+				"SELECT REFERENCE FROM EXAMPLE_ENTITY WHERE ID = ?", new Object[] {id}, String.class);
+		assertThat(reference).isEqualTo("123");
 	}
 
 	@Test