diff --git a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateUnitTests.java b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateUnitTests.java
index 3cbae4adf..2944a1d08 100644
--- a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateUnitTests.java
+++ b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/MongoTemplateUnitTests.java
@@ -51,7 +51,6 @@ import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoSettings;
 import org.mockito.quality.Strictness;
-
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationListener;
@@ -122,16 +121,7 @@ import com.mongodb.client.MongoClient;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoCursor;
 import com.mongodb.client.MongoDatabase;
-import com.mongodb.client.model.CountOptions;
-import com.mongodb.client.model.CreateCollectionOptions;
-import com.mongodb.client.model.DeleteOptions;
-import com.mongodb.client.model.FindOneAndDeleteOptions;
-import com.mongodb.client.model.FindOneAndReplaceOptions;
-import com.mongodb.client.model.FindOneAndUpdateOptions;
-import com.mongodb.client.model.MapReduceAction;
-import com.mongodb.client.model.ReplaceOptions;
-import com.mongodb.client.model.TimeSeriesGranularity;
-import com.mongodb.client.model.UpdateOptions;
+import com.mongodb.client.model.*;
 import com.mongodb.client.result.DeleteResult;
 import com.mongodb.client.result.UpdateResult;
 
@@ -2479,8 +2469,7 @@ public class MongoTemplateUnitTests extends MongoOperationsUnitTests {
 	 */
 	@Override
 	protected MongoOperations getOperationsForExceptionHandling() {
-		MongoTemplate template = spy(this.template);
-		lenient().when(template.getDb()).thenThrow(new MongoException("Error!"));
+		when(template.getMongoDatabaseFactory().getMongoDatabase()).thenThrow(new MongoException("Error"));
 		return template;
 	}
 
diff --git a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/support/SimpleReactiveMongoRepositoryUnitTests.java b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/support/SimpleReactiveMongoRepositoryUnitTests.java
index 0e66f2602..9a4341bf8 100644
--- a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/support/SimpleReactiveMongoRepositoryUnitTests.java
+++ b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/support/SimpleReactiveMongoRepositoryUnitTests.java
@@ -28,7 +28,6 @@ import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
-
 import org.springframework.data.domain.Example;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.mongodb.core.ReactiveMongoOperations;
@@ -43,8 +42,6 @@ import org.springframework.data.mongodb.repository.query.MongoEntityInformation;
 class SimpleReactiveMongoRepositoryUnitTests {
 
 	private SimpleReactiveMongoRepository<Object, String> repository;
-	@Mock Mono mono;
-	@Mock Flux flux;
 	@Mock ReactiveMongoOperations mongoOperations;
 	@Mock MongoEntityInformation<Object, String> entityInformation;
 
@@ -56,7 +53,7 @@ class SimpleReactiveMongoRepositoryUnitTests {
 	@Test // DATAMONGO-1854
 	void shouldAddDefaultCollationToCountForExampleIfPresent() {
 
-		when(mongoOperations.count(any(), any(), any())).thenReturn(mono);
+		when(mongoOperations.count(any(), any(), any())).thenReturn(Mono.empty());
 
 		Collation collation = Collation.of("en_US");
 
@@ -72,7 +69,7 @@ class SimpleReactiveMongoRepositoryUnitTests {
 	@Test // DATAMONGO-1854
 	void shouldAddDefaultCollationToExistsForExampleIfPresent() {
 
-		when(mongoOperations.exists(any(), any(), any())).thenReturn(mono);
+		when(mongoOperations.exists(any(), any(), any())).thenReturn(Mono.empty());
 
 		Collation collation = Collation.of("en_US");
 
@@ -88,7 +85,7 @@ class SimpleReactiveMongoRepositoryUnitTests {
 	@Test // DATAMONGO-1854
 	void shouldAddDefaultCollationToFindForExampleIfPresent() {
 
-		when(mongoOperations.find(any(), any(), any())).thenReturn(flux);
+		when(mongoOperations.find(any(), any(), any())).thenReturn(Flux.empty());
 
 		Collation collation = Collation.of("en_US");
 
@@ -104,7 +101,7 @@ class SimpleReactiveMongoRepositoryUnitTests {
 	@Test // DATAMONGO-1854
 	void shouldAddDefaultCollationToFindWithSortForExampleIfPresent() {
 
-		when(mongoOperations.find(any(), any(), any())).thenReturn(flux);
+		when(mongoOperations.find(any(), any(), any())).thenReturn(Flux.empty());
 
 		Collation collation = Collation.of("en_US");
 
@@ -120,7 +117,8 @@ class SimpleReactiveMongoRepositoryUnitTests {
 	@Test // DATAMONGO-1854
 	void shouldAddDefaultCollationToFindOneForExampleIfPresent() {
 
-		when(mongoOperations.find(any(), any(), any())).thenReturn(flux);
+		when(entityInformation.getCollectionName()).thenReturn("testdummy");
+		doReturn(Flux.empty()).when(mongoOperations).find(any(Query.class), eq(TestDummy.class), eq("testdummy"));
 
 		Collation collation = Collation.of("en_US");