Add nullability annotations to tests in module/spring-boot-data-neo4j-test

See gh-47263

module/spring-boot-data-neo4j-test/build.gradle

@@ -45,3 +45,11 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-data-neo4j-test/src/dockerTest/java/org/springframework/boot/data/neo4j/test/autoconfigure/ExampleGraph.java

@@ -31,6 +31,7 @@ public class ExampleGraph {
 
 	@Id
 	@GeneratedValue
+	@SuppressWarnings("NullAway.Init")
 	private Long id;
 
 	@Property