diff --git a/driver-sync/src/test/functional/com/mongodb/client/ClientSideEncryptionExternalKeyVaultTest.java b/driver-sync/src/test/functional/com/mongodb/client/ClientSideEncryptionExternalKeyVaultTest.java
index f4b6b336e96..da513bb2a9e 100644
--- a/driver-sync/src/test/functional/com/mongodb/client/ClientSideEncryptionExternalKeyVaultTest.java
+++ b/driver-sync/src/test/functional/com/mongodb/client/ClientSideEncryptionExternalKeyVaultTest.java
@@ -20,9 +20,11 @@
 import com.mongodb.ClientEncryptionSettings;
 import com.mongodb.MongoClientSettings;
 import com.mongodb.MongoCredential;
+import com.mongodb.MongoNamespace;
 import com.mongodb.MongoSecurityException;
 import com.mongodb.WriteConcern;
 import com.mongodb.client.model.vault.EncryptOptions;
+import com.mongodb.client.test.CollectionHelper;
 import com.mongodb.client.vault.ClientEncryption;
 import com.mongodb.client.vault.ClientEncryptions;
 import org.bson.BsonBinary;
@@ -57,6 +59,7 @@ public class ClientSideEncryptionExternalKeyVaultTest {
     private MongoClient client, clientEncrypted;
     private ClientEncryption clientEncryption;
     private final boolean withExternalKeyVault;
+    private static final MongoNamespace NAMESPACE = new MongoNamespace("db", ClientSideEncryptionExternalKeyVaultTest.class.getName());
 
     public ClientSideEncryptionExternalKeyVaultTest(final boolean withExternalKeyVault) {
         this.withExternalKeyVault = withExternalKeyVault;
@@ -84,7 +87,7 @@ public void setUp() throws IOException, URISyntaxException {
                 + "UN3YkQ5aXRRMkhGRGdQV09wOGVNYUMxT2k3NjZKelhaQmRCZGJkTXVyZG9uSjFk");
         localMasterkey.put("key", localMasterkeyBytes);
         kmsProviders.put("local", localMasterkey);
-        schemaMap.put("db.coll", bsonDocumentFromPath("external-schema.json"));
+        schemaMap.put(NAMESPACE.getFullName(), bsonDocumentFromPath("external-schema.json"));
 
         AutoEncryptionSettings.Builder autoEncryptionSettingsBuilder = AutoEncryptionSettings.builder()
                 .keyVaultNamespace("keyvault.datakeys")
@@ -123,8 +126,8 @@ public void setUp() throws IOException, URISyntaxException {
     public void testExternal() {
         boolean authExceptionThrown = false;
         MongoCollection<BsonDocument> coll = clientEncrypted
-                .getDatabase("db")
-                .getCollection("coll", BsonDocument.class);
+                .getDatabase(NAMESPACE.getDatabaseName())
+                .getCollection(NAMESPACE.getCollectionName(), BsonDocument.class);
         try {
             coll.insertOne(new BsonDocument().append("encrypted", new BsonString("test")));
         } catch (MongoSecurityException mse) {
@@ -169,5 +172,7 @@ public void after() {
                 // ignore
             }
         }
+
+        CollectionHelper.drop(NAMESPACE);
     }
 }
diff --git a/driver-sync/src/test/functional/com/mongodb/client/CrudProseTest.java b/driver-sync/src/test/functional/com/mongodb/client/CrudProseTest.java
index 7138cdfe67e..016887c33b7 100644
--- a/driver-sync/src/test/functional/com/mongodb/client/CrudProseTest.java
+++ b/driver-sync/src/test/functional/com/mongodb/client/CrudProseTest.java
@@ -34,6 +34,7 @@
 import com.mongodb.client.model.bulk.ClientBulkWriteOptions;
 import com.mongodb.client.model.bulk.ClientBulkWriteResult;
 import com.mongodb.client.model.bulk.ClientNamespacedWriteModel;
+import com.mongodb.client.test.CollectionHelper;
 import com.mongodb.event.CommandStartedEvent;
 import com.mongodb.internal.connection.TestCommandListener;
 import org.bson.BsonArray;
@@ -47,6 +48,7 @@
 import org.bson.RawBsonDocument;
 import org.bson.codecs.configuration.CodecRegistry;
 import org.bson.codecs.pojo.PojoCodecProvider;
+import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -96,7 +98,7 @@
  * <a href="https://github.com/mongodb/specifications/blob/master/source/crud/tests/README.md#prose-tests">CRUD Prose Tests</a>.
  */
 public class CrudProseTest {
-    private static final MongoNamespace NAMESPACE = new MongoNamespace("db", "coll");
+    private static final MongoNamespace NAMESPACE = new MongoNamespace("db", CrudProseTest.class.getName());
 
     @DisplayName("1. WriteConcernError.details exposes writeConcernError.errInfo")
     @Test
@@ -367,7 +369,8 @@ private void testBulkWriteSplitsWhenExceedingMaxMessageSizeBytesDueToNsInfo(
             Document helloResponse = droppedDatabase(client).runCommand(new Document("hello", 1));
             int maxBsonObjectSize = helloResponse.getInteger("maxBsonObjectSize");
             int maxMessageSizeBytes = helloResponse.getInteger("maxMessageSizeBytes");
-            int opsBytes = maxMessageSizeBytes - 1122;
+            // By the spec test, we have to subtract only 1122, however, we have different collection name.
+            int opsBytes = maxMessageSizeBytes - 1118 - NAMESPACE.getCollectionName().length();
             int numModels = opsBytes / maxBsonObjectSize;
             int remainderBytes = opsBytes % maxBsonObjectSize;
             List<ClientNamespacedWriteModel> models = new ArrayList<>(nCopies(
@@ -613,4 +616,9 @@ private static ClientBulkWriteResult runInTransaction(final ClientSession sessio
             throw throwable;
         }
     }
+
+    @AfterAll
+    public static void cleanUp() {
+        CollectionHelper.drop(NAMESPACE);
+    }
 }