import org.hamcrest.Matchers; import org.junit.Assert; // ... assertThat(listOfMessages, Matchers.hasItem(Matchers.>hasProperty("offset", equalTo(1L))));
import static org.hamcrest.MatcherAssert.assertThat; import static org.hamcrest.Matchers.is; import static org.mockito.ArgumentMatchers.anyString; // ... assertThat(channel, Matchers.assertAcked(anyString()));This code uses the `assertAcked` matcher from the Hamcrest library to check that a message has been acknowledged in RabbitMQ. The org.hamcrest.Matchers assertAcked method is part of the Hamcrest library, which is a collection of matchers for unit testing.