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

See gh-47263

module/spring-boot-couchbase/build.gradle

@@ -44,5 +44,15 @@ dependencies {
 	testImplementation(project(":core:spring-boot-test"))
 	testImplementation(project(":test-support:spring-boot-test-support"))
 
+	testCompileOnly("com.google.code.findbugs:jsr305")
+
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-couchbase/src/test/java/org/springframework/boot/couchbase/health/CouchbaseReactiveHealthIndicatorTests.java

@@ -60,6 +60,7 @@ class CouchbaseReactiveHealthIndicatorTests {
 		given(reactiveCluster.diagnostics()).willReturn(Mono.just(diagnostics));
 		given(cluster.reactive()).willReturn(reactiveCluster);
 		Health health = healthIndicator.health().block(Duration.ofSeconds(30));
+		assertThat(health).isNotNull();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
 		assertThat(health.getDetails()).containsEntry("sdk", "test-sdk");
 		assertThat(health.getDetails()).containsKey("endpoints");
@@ -85,6 +86,7 @@ class CouchbaseReactiveHealthIndicatorTests {
 		given(reactiveCluster.diagnostics()).willReturn(Mono.just(diagnostics));
 		given(cluster.reactive()).willReturn(reactiveCluster);
 		Health health = healthIndicator.health().block(Duration.ofSeconds(30));
+		assertThat(health).isNotNull();
 		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
 		assertThat(health.getDetails()).containsEntry("sdk", "test-sdk");
 		assertThat(health.getDetails()).containsKey("endpoints");