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

See gh-47263

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

@@ -44,7 +44,17 @@ dependencies {
 	dockerTestImplementation("org.testcontainers:mongodb")
 	dockerTestImplementation("org.testcontainers:testcontainers")
 
+	dockerTestCompileOnly("com.google.code.findbugs:jsr305")
+
 	testImplementation(project(":test-support:spring-boot-test-support"))
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-data-mongodb-test/src/dockerTest/java/org/springframework/boot/data/mongodb/test/autoconfigure/DataMongoTestReactiveIntegrationTests.java

@@ -57,6 +57,7 @@ class DataMongoTestReactiveIntegrationTests {
 		ExampleDocument exampleDocument = new ExampleDocument();
 		exampleDocument.setText("Look, new @DataMongoTest!");
 		exampleDocument = this.exampleRepository.save(exampleDocument).block(Duration.ofSeconds(30));
+		assertThat(exampleDocument).isNotNull();
 		assertThat(exampleDocument.getId()).isNotNull();
 		assertThat(this.mongoTemplate.collectionExists("exampleDocuments").block(Duration.ofSeconds(30))).isTrue();
 	}

module/spring-boot-data-mongodb-test/src/dockerTest/java/org/springframework/boot/data/mongodb/test/autoconfigure/ExampleDocument.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.data.mongodb.test.autoconfigure;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.mongodb.core.mapping.Document;
 
 /**
@@ -26,23 +28,23 @@ import org.springframework.data.mongodb.core.mapping.Document;
 @Document(collection = "exampleDocuments")
 public class ExampleDocument {
 
-	private String id;
+	private @Nullable String id;
 
-	private String text;
+	private @Nullable String text;
 
-	public String getId() {
+	public @Nullable String getId() {
 		return this.id;
 	}
 
-	public void setId(String id) {
+	public void setId(@Nullable String id) {
 		this.id = id;
 	}
 
-	public String getText() {
+	public @Nullable String getText() {
 		return this.text;
 	}
 
-	public void setText(String text) {
+	public void setText(@Nullable String text) {
 		this.text = text;
 	}