Add nullability annotations to tests in module/spring-boot-thymeleaf

See gh-47263

module/spring-boot-thymeleaf/build.gradle

@@ -49,3 +49,7 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-thymeleaf/src/test/java/org/springframework/boot/thymeleaf/autoconfigure/ThymeleafServletAutoConfigurationTests.java

@@ -206,6 +206,7 @@ class ThymeleafServletAutoConfigurationTests {
 		this.contextRunner.run((context) -> {
 			ThymeleafView view = (ThymeleafView) context.getBean(ThymeleafViewResolver.class)
 				.resolveViewName("view", Locale.UK);
+			assertThat(view).isNotNull();
 			MockHttpServletResponse response = new MockHttpServletResponse();
 			MockHttpServletRequest request = new MockHttpServletRequest(context.getBean(ServletContext.class));
 			request.setAttribute(RequestContext.WEB_APPLICATION_CONTEXT_ATTRIBUTE, context);