diff --git a/module/spring-boot-security-test/build.gradle b/module/spring-boot-security-test/build.gradle
index 51f12b8b147..9932ee80b32 100644
--- a/module/spring-boot-security-test/build.gradle
+++ b/module/spring-boot-security-test/build.gradle
@@ -40,3 +40,7 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/module/spring-boot-security-test/src/test/java/org/springframework/boot/security/test/autoconfigure/webflux/WebTestClientSecurityIntegrationTests.java b/module/spring-boot-security-test/src/test/java/org/springframework/boot/security/test/autoconfigure/webflux/WebTestClientSecurityIntegrationTests.java
index c470714c97d..708c6f216a4 100644
--- a/module/spring-boot-security-test/src/test/java/org/springframework/boot/security/test/autoconfigure/webflux/WebTestClientSecurityIntegrationTests.java
+++ b/module/spring-boot-security-test/src/test/java/org/springframework/boot/security/test/autoconfigure/webflux/WebTestClientSecurityIntegrationTests.java
@@ -51,9 +51,12 @@ class WebTestClientSecurityIntegrationTests {
 			WebTestClient webTestClient = context.getBean(WebTestClient.class);
 			WebTestClient.Builder builder = (WebTestClient.Builder) ReflectionTestUtils.getField(webTestClient,
 					"builder");
+			assertThat(builder).isNotNull();
 			WebHttpHandlerBuilder httpHandlerBuilder = (WebHttpHandlerBuilder) ReflectionTestUtils.getField(builder,
 					"httpHandlerBuilder");
+			assertThat(httpHandlerBuilder).isNotNull();
 			List<WebFilter> filters = (List<WebFilter>) ReflectionTestUtils.getField(httpHandlerBuilder, "filters");
+			assertThat(filters).isNotNull();
 			assertThat(filters.get(0).getClass().getName()).isEqualTo(
 					"org.springframework.security.test.web.reactive.server.SecurityMockServerConfigurers$MutatorFilter");
 		});