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

See gh-47263

module/spring-boot-neo4j/build.gradle

@@ -55,3 +55,11 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}

module/spring-boot-neo4j/src/test/java/org/springframework/boot/neo4j/autoconfigure/Neo4jPropertiesTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.neo4j.autoconfigure;
 
 import java.time.Duration;
 
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 import org.neo4j.driver.Config;
 import org.neo4j.driver.internal.retry.RetrySettings;
@@ -64,11 +65,12 @@ class Neo4jPropertiesTests {
 		assertDuration(properties.getMaxTransactionRetryTime(), RetrySettings.DEFAULT.maxRetryTimeMs());
 	}
 
-	private static void assertDuration(Duration duration, long expectedValueInMillis) {
+	private static void assertDuration(@Nullable Duration duration, long expectedValueInMillis) {
 		if (expectedValueInMillis == -1) {
 			assertThat(duration).isNull();
 		}
 		else {
+			assertThat(duration).isNotNull();
 			assertThat(duration.toMillis()).isEqualTo(expectedValueInMillis);
 		}
 	}

module/spring-boot-neo4j/src/test/java/org/springframework/boot/neo4j/autoconfigure/health/Neo4jHealthContributorAutoConfigurationTests.java

@@ -78,6 +78,7 @@ class Neo4jHealthContributorAutoConfigurationTests {
 			.run((context) -> {
 				assertThat(context).hasBean("neo4jHealthIndicator");
 				Health health = context.getBean("neo4jHealthIndicator", HealthIndicator.class).health();
+				assertThat(health).isNotNull();
 				assertThat(health.getDetails()).containsOnly(entry("test", true));
 			});
 	}

module/spring-boot-neo4j/src/test/java/org/springframework/boot/neo4j/health/ResultSummaryMock.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.neo4j.health;
 
+import org.jspecify.annotations.Nullable;
 import org.neo4j.driver.summary.DatabaseInfo;
 import org.neo4j.driver.summary.ResultSummary;
 import org.neo4j.driver.summary.ServerInfo;
@@ -33,7 +34,7 @@ final class ResultSummaryMock {
 	private ResultSummaryMock() {
 	}
 
-	static ResultSummary createResultSummary(String serverAddress, String databaseName) {
+	static ResultSummary createResultSummary(String serverAddress, @Nullable String databaseName) {
 		ServerInfo serverInfo = mock(ServerInfo.class);
 		given(serverInfo.address()).willReturn(serverAddress);
 		DatabaseInfo databaseInfo = mock(DatabaseInfo.class);