Add nullability annotations to tests in module/spring-boot-data-jpa-test

See gh-47263

module/spring-boot-data-jpa-test/build.gradle

@@ -38,3 +38,7 @@ dependencies {
 	testRuntimeOnly("com.h2database:h2")
 	testRuntimeOnly("org.hsqldb:hsqldb")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

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

@@ -67,7 +67,9 @@ class DataJpaTestIntegrationTests {
 		ExampleEntity entity = this.entities.persist(new ExampleEntity("spring", "123"));
 		this.entities.flush();
 		Object id = this.entities.getId(entity);
+		assertThat(id).isNotNull();
 		ExampleEntity found = this.entities.find(ExampleEntity.class, id);
+		assertThat(found).isNotNull();
 		assertThat(found.getName()).isEqualTo("spring");
 	}
 

module/spring-boot-data-jpa-test/src/test/java/org/springframework/boot/data/jpa/test/autoconfigure/ExampleEntity.java

@@ -30,10 +30,13 @@ public class ExampleEntity {
 
 	@Id
 	@GeneratedValue
+	@SuppressWarnings("NullAway.Init")
 	private Long id;
 
+	@SuppressWarnings("NullAway.Init")
 	private String name;
 
+	@SuppressWarnings("NullAway.Init")
 	private String reference;
 
 	protected ExampleEntity() {