Polishing.

Fix missing imports.

See #1331

Author: mp911de

spring-data-cassandra/src/test/java/org/springframework/data/cassandra/observability/ImperativeIntegrationTests.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.data.cassandra.observability;
 
+import static org.assertj.core.api.Assertions.*;
+
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
 import io.micrometer.observation.ObservationRegistry;

spring-data-cassandra/src/test/java/org/springframework/data/cassandra/observability/ReactiveIntegrationTests.java

@@ -21,6 +21,7 @@
 import io.micrometer.observation.ObservationRegistry;
 import io.micrometer.observation.contextpropagation.ObservationThreadLocalAccessor;
 import io.micrometer.tracing.test.SampleTestRunner;
+import static org.assertj.core.api.Assertions.*;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 import reactor.util.context.Context;