fix: Improve error messages in tests (#1855)

* Better failure message.

* chore: generate libraries at Mon Sep 30 15:12:53 UTC 2024

* Pretty

---------

Co-authored-by: cloud-java-bot <cloud-java-bot@google.com>

google-cloud-firestore/src/test/java/com/google/cloud/firestore/WatchTest.java

@@ -24,11 +24,11 @@
 import static com.google.cloud.firestore.LocalFirestoreHelper.UPDATED_FIELD_PROTO;
 import static com.google.cloud.firestore.LocalFirestoreHelper.map;
 import static com.google.cloud.firestore.LocalFirestoreHelper.string;
+import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.*;
 
 import com.google.api.gax.grpc.GrpcStatusCode;
@@ -169,10 +169,11 @@ public void before() {
 
   @After
   public void after() {
-    assertTrue(exceptions.isEmpty());
-    assertTrue(requests.isEmpty());
-    assertTrue(documentSnapshots.isEmpty());
-    assertTrue(querySnapshots.isEmpty());
+    Object[] emptyArray = new Object[0];
+    assertArrayEquals(exceptions.toArray(), emptyArray);
+    assertArrayEquals(requests.toArray(), emptyArray);
+    assertArrayEquals(documentSnapshots.toArray(), emptyArray);
+    assertArrayEquals(querySnapshots.toArray(), emptyArray);
     listenerRegistration.remove();
   }