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

See gh-47263

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

@@ -34,3 +34,7 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

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

@@ -43,12 +43,15 @@ import static org.mockito.BDDMockito.then;
 class TestEntityManagerTests {
 
 	@Mock
+	@SuppressWarnings("NullAway.Init")
 	private EntityManagerFactory entityManagerFactory;
 
 	@Mock
+	@SuppressWarnings("NullAway.Init")
 	private EntityManager entityManager;
 
 	@Mock
+	@SuppressWarnings("NullAway.Init")
 	private PersistenceUnitUtil persistenceUnitUtil;
 
 	private TestEntityManager testEntityManager;
@@ -59,6 +62,7 @@ class TestEntityManagerTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void createWhenEntityManagerIsNullShouldThrowException() {
 		assertThatIllegalArgumentException().isThrownBy(() -> new TestEntityManager(null))
 			.withMessageContaining("'entityManagerFactory' must not be null");