diff --git a/ReportPortal.Client/Service.Launch.cs b/ReportPortal.Client/Service.Launch.cs
index 2125e339..5b56d79f 100644
--- a/ReportPortal.Client/Service.Launch.cs
+++ b/ReportPortal.Client/Service.Launch.cs
@@ -18,7 +18,7 @@ public partial class Service
         /// <param name="filterOption">Specified criterias for retrieving launches.</param>
         /// <param name="debug">Returns user debug launches or not.</param>
         /// <returns>A list of launches.</returns>
-        public async Task<LaunchesContainer> GetLaunchesAsync(FilterOption filterOption = null, bool debug = false)
+        public virtual async Task<LaunchesContainer> GetLaunchesAsync(FilterOption filterOption = null, bool debug = false)
         {
             var uri = BaseUri.Append($"{Project}/launch");
             if (debug) { uri = uri.Append("mode"); }
@@ -38,7 +38,7 @@ public async Task<LaunchesContainer> GetLaunchesAsync(FilterOption filterOption
         /// </summary>
         /// <param name="id">ID of the launch to retrieve.</param>
         /// <returns>A representation of launch.</returns>
-        public async Task<Launch> GetLaunchAsync(string id)
+        public virtual async Task<Launch> GetLaunchAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/launch/{id}");
             var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
@@ -51,7 +51,7 @@ public async Task<Launch> GetLaunchAsync(string id)
         /// </summary>
         /// <param name="model">Information about representation of launch.</param>
         /// <returns>Representation of just created launch.</returns>
-        public async Task<Launch> StartLaunchAsync(StartLaunchRequest model)
+        public virtual async Task<Launch> StartLaunchAsync(StartLaunchRequest model)
         {
             var uri = BaseUri.Append($"{Project}/launch");
             var body = ModelSerializer.Serialize<StartLaunchRequest>(model);
@@ -67,7 +67,7 @@ public async Task<Launch> StartLaunchAsync(StartLaunchRequest model)
         /// <param name="model">Information about representation of launch to finish.</param>
         /// <param name="force">Force finish launch even if test items are in progress.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> FinishLaunchAsync(string id, FinishLaunchRequest model, bool force = false)
+        public virtual async Task<Message> FinishLaunchAsync(string id, FinishLaunchRequest model, bool force = false)
         {
             var uri = BaseUri.Append($"{Project}/launch/{id}");
             uri = force == true ? uri.Append("/stop") : uri.Append("/finish");
@@ -82,7 +82,7 @@ public async Task<Message> FinishLaunchAsync(string id, FinishLaunchRequest mode
         /// </summary>
         /// <param name="id">ID of the launch to delete.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> DeleteLaunchAsync(string id)
+        public virtual async Task<Message> DeleteLaunchAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/launch/{id}");
             var response = await _httpClient.DeleteAsync(uri).ConfigureAwait(false);
@@ -95,7 +95,7 @@ public async Task<Message> DeleteLaunchAsync(string id)
         /// </summary>
         /// <param name="model">Request for merging.</param>
         /// <returns>Returns the model of merged launches.</returns>
-        public async Task<Launch> MergeLaunchesAsync(MergeLaunchesRequest model)
+        public virtual async Task<Launch> MergeLaunchesAsync(MergeLaunchesRequest model)
         {
             var uri = BaseUri.Append($"{Project}/launch/merge");
             var body = ModelSerializer.Serialize<MergeLaunchesRequest>(model);
@@ -110,7 +110,7 @@ public async Task<Launch> MergeLaunchesAsync(MergeLaunchesRequest model)
         /// <param name="id">ID of launch to update.</param>
         /// <param name="model">Information about launch.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> UpdateLaunchAsync(string id, UpdateLaunchRequest model)
+        public virtual async Task<Message> UpdateLaunchAsync(string id, UpdateLaunchRequest model)
         {
             var uri = BaseUri.Append($"{Project}/launch/{id}/update");
             var body = ModelSerializer.Serialize<UpdateLaunchRequest>(model);
@@ -123,7 +123,7 @@ public async Task<Message> UpdateLaunchAsync(string id, UpdateLaunchRequest mode
         /// Merge several launches.
         /// </summary>
         /// <returns>A message from service.</returns>
-        public async Task<Message> AnalyzeLaunchAsync(AnalyzeLaunchRequest model)
+        public virtual async Task<Message> AnalyzeLaunchAsync(AnalyzeLaunchRequest model)
         {
             var uri = BaseUri.Append($"{Project}/launch/analyze");
             var body = ModelSerializer.Serialize<AnalyzeLaunchRequest>(model);
diff --git a/ReportPortal.Client/Service.LogItem.cs b/ReportPortal.Client/Service.LogItem.cs
index bac13445..15d66596 100644
--- a/ReportPortal.Client/Service.LogItem.cs
+++ b/ReportPortal.Client/Service.LogItem.cs
@@ -18,7 +18,7 @@ public partial class Service
         /// </summary>
         /// <param name="filterOption">Specified criterias for retrieving log items.</param>
         /// <returns>A list of log items.</returns>
-        public async Task<LogItemsContainer> GetLogItemsAsync(FilterOption filterOption = null)
+        public virtual async Task<LogItemsContainer> GetLogItemsAsync(FilterOption filterOption = null)
         {
             var uri = BaseUri.Append($"{Project}/log");
             
@@ -37,7 +37,7 @@ public async Task<LogItemsContainer> GetLogItemsAsync(FilterOption filterOption
         /// </summary>
         /// <param name="id">ID of the log item to retrieve.</param>
         /// <returns>A representation of log item/</returns>
-        public async Task<LogItem> GetLogItemAsync(string id)
+        public virtual async Task<LogItem> GetLogItemAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/log/{id}");
             var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
@@ -50,7 +50,7 @@ public async Task<LogItem> GetLogItemAsync(string id)
         /// </summary>
         /// <param name="id">ID of data.</param>
         /// <returns>Array of bytes.</returns>
-        public async Task<byte[]> GetBinaryDataAsync(string id)
+        public virtual async Task<byte[]> GetBinaryDataAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/data/{id}");
             var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
@@ -63,7 +63,7 @@ public async Task<byte[]> GetBinaryDataAsync(string id)
         /// </summary>
         /// <param name="model">Information about representation of log item.</param>
         /// <returns>Representation of just created log item.</returns>
-        public async Task<LogItem> AddLogItemAsync(AddLogItemRequest model)
+        public virtual async Task<LogItem> AddLogItemAsync(AddLogItemRequest model)
         {
             var uri = BaseUri.Append($"{Project}/log");
 
@@ -105,7 +105,7 @@ public class Responses
         /// </summary>
         /// <param name="id">ID of the log item to delete.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> DeleteLogItemAsync(string id)
+        public virtual async Task<Message> DeleteLogItemAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/log/{id}");
             var response = await _httpClient.DeleteAsync(uri).ConfigureAwait(false);
diff --git a/ReportPortal.Client/Service.Project.cs b/ReportPortal.Client/Service.Project.cs
index 52869b23..d9698f0f 100644
--- a/ReportPortal.Client/Service.Project.cs
+++ b/ReportPortal.Client/Service.Project.cs
@@ -18,7 +18,7 @@ public partial class Service
         /// <param name="model"></param>
         /// <param name="userName"></param>
         /// <returns></returns>
-        public async Task<UpdatePreferencesResponse> UpdatePreferencesAsync(UpdatePreferenceRequest model, string userName)
+        public virtual async Task<UpdatePreferencesResponse> UpdatePreferencesAsync(UpdatePreferenceRequest model, string userName)
         {
             var uri = BaseUri.Append($"project/{Project}/preference/{userName}");
             var body = ModelSerializer.Serialize<UpdatePreferenceRequest>(model);
@@ -40,7 +40,7 @@ public class UpdatePreferencesResponse
         /// </summary>
         /// <param name="userName"></param>
         /// <returns></returns>
-        public async Task<Preference> GetAllPreferences(string userName)
+        public virtual async Task<Preference> GetAllPreferences(string userName)
         {
             var uri = BaseUri.Append($"project/{Project}/preference/{userName}");
             
diff --git a/ReportPortal.Client/Service.TestItem.cs b/ReportPortal.Client/Service.TestItem.cs
index 5f91cd43..377cc609 100644
--- a/ReportPortal.Client/Service.TestItem.cs
+++ b/ReportPortal.Client/Service.TestItem.cs
@@ -18,7 +18,7 @@ public partial class Service
         /// </summary>
         /// <param name="filterOption">Specified criterias for retrieving test items.</param>
         /// <returns>A list of test items.</returns>
-        public async Task<TestItemsContainer> GetTestItemsAsync(FilterOption filterOption = null)
+        public virtual async Task<TestItemsContainer> GetTestItemsAsync(FilterOption filterOption = null)
         {
             var uri = BaseUri.Append($"{Project}/item");
             if (filterOption != null)
@@ -35,7 +35,7 @@ public async Task<TestItemsContainer> GetTestItemsAsync(FilterOption filterOptio
         /// </summary>
         /// <param name="id">ID of the test item to retrieve.</param>
         /// <returns>A representation of test item.</returns>
-        public async Task<TestItem> GetTestItemAsync(string id)
+        public virtual async Task<TestItem> GetTestItemAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/item/{id}");
             var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
@@ -49,7 +49,7 @@ public async Task<TestItem> GetTestItemAsync(string id)
         /// <param name="launchId">ID of launch.</param>
         /// <param name="tagContains">Tags should contain specified text.</param>
         /// <returns></returns>
-        public async Task<List<string>> GetUniqueTagsAsync(string launchId, string tagContains)
+        public virtual async Task<List<string>> GetUniqueTagsAsync(string launchId, string tagContains)
         {
             var uri = BaseUri.Append($"{Project}/item/tags?launch={launchId}&filter.cnt.tags={tagContains}");
 
@@ -63,7 +63,7 @@ public async Task<List<string>> GetUniqueTagsAsync(string launchId, string tagCo
         /// </summary>
         /// <param name="model">Information about representation of test item.</param>
         /// <returns>Representation of created test item.</returns>
-        public async Task<TestItem> StartTestItemAsync(StartTestItemRequest model)
+        public virtual async Task<TestItem> StartTestItemAsync(StartTestItemRequest model)
         {
             var uri = BaseUri.Append($"{Project}/item");
             var body = ModelSerializer.Serialize<StartTestItemRequest>(model);
@@ -78,7 +78,7 @@ public async Task<TestItem> StartTestItemAsync(StartTestItemRequest model)
         /// <param name="id">ID of parent item.</param>
         /// <param name="model">Information about representation of test item.</param>
         /// <returns>Representation of created test item.</returns>
-        public async Task<TestItem> StartTestItemAsync(string id, StartTestItemRequest model)
+        public virtual async Task<TestItem> StartTestItemAsync(string id, StartTestItemRequest model)
         {
             var uri = BaseUri.Append($"{Project}/item/{id}");
             var body = ModelSerializer.Serialize<StartTestItemRequest>(model);
@@ -93,7 +93,7 @@ public async Task<TestItem> StartTestItemAsync(string id, StartTestItemRequest m
         /// <param name="id">ID of specified test item.</param>
         /// <param name="model">Information about representation of test item to finish.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> FinishTestItemAsync(string id, FinishTestItemRequest model)
+        public virtual async Task<Message> FinishTestItemAsync(string id, FinishTestItemRequest model)
         {
             var uri = BaseUri.Append($"{Project}/item/{id}");
             var body = ModelSerializer.Serialize<FinishTestItemRequest>(model);
@@ -108,7 +108,7 @@ public async Task<Message> FinishTestItemAsync(string id, FinishTestItemRequest
         /// <param name="id">ID of test item to update.</param>
         /// <param name="model">Information about test item.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> UpdateTestItemAsync(string id, UpdateTestItemRequest model)
+        public virtual async Task<Message> UpdateTestItemAsync(string id, UpdateTestItemRequest model)
         {
             var uri = BaseUri.Append($"{Project}/item/{id}/update");
             var body = ModelSerializer.Serialize<UpdateTestItemRequest>(model);
@@ -122,7 +122,7 @@ public async Task<Message> UpdateTestItemAsync(string id, UpdateTestItemRequest
         /// </summary>
         /// <param name="id">ID of the test item to delete.</param>
         /// <returns>A message from service.</returns>
-        public async Task<Message> DeleteTestItemAsync(string id)
+        public virtual async Task<Message> DeleteTestItemAsync(string id)
         {
             var uri = BaseUri.Append($"{Project}/item/{id}");
             var response = await _httpClient.DeleteAsync(uri).ConfigureAwait(false);
@@ -135,7 +135,7 @@ public async Task<Message> DeleteTestItemAsync(string id)
         /// </summary>
         /// <param name="model">Information about test items and their issues.</param>
         /// <returns>A list of assigned issues.</returns>
-        public async Task<List<Issue>> AssignTestItemIssuesAsync(AssignTestItemIssuesRequest model)
+        public virtual async Task<List<Issue>> AssignTestItemIssuesAsync(AssignTestItemIssuesRequest model)
         {
             var uri = BaseUri.Append($"{Project}/item");
             var body = ModelSerializer.Serialize<AssignTestItemIssuesRequest>(model);
@@ -143,7 +143,7 @@ public async Task<List<Issue>> AssignTestItemIssuesAsync(AssignTestItemIssuesReq
             response.VerifySuccessStatusCode();
             return ModelSerializer.Deserialize<List<Issue>>(await response.Content.ReadAsStringAsync().ConfigureAwait(false));
         }
-        
+
         /// <summary>
         /// Get the history of test item executions.
         /// </summary>
@@ -151,7 +151,7 @@ public async Task<List<Issue>> AssignTestItemIssuesAsync(AssignTestItemIssuesReq
         /// <param name="depth">How many executions to return.</param>
         /// <param name="full"></param>
         /// <returns>The list of execution history.</returns>
-        public async Task<List<TestItemHistory>> GetTestItemHistoryAsync(string testItemId, int depth, bool full)
+        public virtual async Task<List<TestItemHistory>> GetTestItemHistoryAsync(string testItemId, int depth, bool full)
         {
             var uri = BaseUri.Append($"{Project}/item/history?ids={testItemId}&history_depth={depth}&is_full={full}");
 
diff --git a/ReportPortal.Client/Service.User.cs b/ReportPortal.Client/Service.User.cs
index 2f3c0a39..054a2048 100644
--- a/ReportPortal.Client/Service.User.cs
+++ b/ReportPortal.Client/Service.User.cs
@@ -7,7 +7,7 @@ namespace ReportPortal.Client
 {
     public partial class Service
     {
-        public async Task<User> GetUserAsync()
+        public virtual async Task<User> GetUserAsync()
         {
             var uri = BaseUri.Append($"user");
             var response = await _httpClient.GetAsync(uri).ConfigureAwait(false);
diff --git a/ReportPortal.Client/Service.UserFilter.cs b/ReportPortal.Client/Service.UserFilter.cs
index 2bb58fb5..5f272417 100644
--- a/ReportPortal.Client/Service.UserFilter.cs
+++ b/ReportPortal.Client/Service.UserFilter.cs
@@ -18,7 +18,7 @@ public partial class Service
         /// </summary>
         /// <param name="model"></param>
         /// <returns></returns>
-        public async Task<List<EntryCreated>> AddUserFilterAsync(AddUserFilterRequest model)
+        public virtual async Task<List<EntryCreated>> AddUserFilterAsync(AddUserFilterRequest model)
         {
             var uri = BaseUri.Append($"{Project}/filter");
 
@@ -33,7 +33,7 @@ public async Task<List<EntryCreated>> AddUserFilterAsync(AddUserFilterRequest mo
         /// </summary>
         /// <param name="filterOption"></param>
         /// <returns></returns>
-        public async Task<UserFilterContainer> GetUserFiltersAsync(FilterOption filterOption = null)
+        public virtual async Task<UserFilterContainer> GetUserFiltersAsync(FilterOption filterOption = null)
         {
             var uri = BaseUri.Append($"{Project}/filter/");
             if (filterOption != null)
@@ -50,7 +50,7 @@ public async Task<UserFilterContainer> GetUserFiltersAsync(FilterOption filterOp
         /// </summary>
         /// <param name="filterId"></param>
         /// <returns></returns>
-        public async Task<Message> DeleteUserFilterAsync(string filterId)
+        public virtual async Task<Message> DeleteUserFilterAsync(string filterId)
         {
             var uri = BaseUri.Append($"{Project}/filter/{filterId}");