diff --git a/module/spring-boot-cassandra/build.gradle b/module/spring-boot-cassandra/build.gradle
index 48e035d55ab..9aeff368ddb 100644
--- a/module/spring-boot-cassandra/build.gradle
+++ b/module/spring-boot-cassandra/build.gradle
@@ -48,3 +48,11 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverHealthIndicatorTests.java b/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverHealthIndicatorTests.java
index fe6ac9ea725..a731750ba65 100644
--- a/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverHealthIndicatorTests.java
+++ b/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverHealthIndicatorTests.java
@@ -48,8 +48,10 @@ import static org.mockito.Mockito.mock;
 class CassandraDriverHealthIndicatorTests {
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void createWhenCqlSessionIsNullShouldThrowException() {
-		assertThatIllegalArgumentException().isThrownBy(() -> new CassandraDriverHealthIndicator(null));
+		assertThatIllegalArgumentException().isThrownBy(() -> new CassandraDriverHealthIndicator(null))
+			.withMessage("'session' must not be null");
 	}
 
 	@Test
diff --git a/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverReactiveHealthIndicatorTests.java b/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverReactiveHealthIndicatorTests.java
index c8472006b27..cdeddba87f7 100644
--- a/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverReactiveHealthIndicatorTests.java
+++ b/module/spring-boot-cassandra/src/test/java/org/springframework/boot/cassandra/health/CassandraDriverReactiveHealthIndicatorTests.java
@@ -51,8 +51,10 @@ import static org.mockito.Mockito.mock;
 class CassandraDriverReactiveHealthIndicatorTests {
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void createWhenCqlSessionIsNullShouldThrowException() {
-		assertThatIllegalArgumentException().isThrownBy(() -> new CassandraDriverReactiveHealthIndicator(null));
+		assertThatIllegalArgumentException().isThrownBy(() -> new CassandraDriverReactiveHealthIndicator(null))
+			.withMessage("'session' must not be null");
 	}
 
 	@Test