Update() public method

Create existing folder. The collection_id/collection_key parameter means that one can use either one of them - collection_id or collection_key.
public Update ( string projectId, string name, string collectionId = null, string collectionKey = null, string newName = null, string sourceId = null ) : Task
projectId string Project id.
name string Current folder name.
collectionId string Collection id defining collection where folder exists.
collectionKey string Collection key defining collection where folder exists.
newName string New folder name.
sourceId string New source id, can be used for mapping folders to external source.
return Task
 public async Task Update_WithNullProjectId_ThrowsException(FolderSyncanoClient client)
 {
     try
     {
         //when
         await client.Update(null, TestData.FolderName, TestData.CollectionId);
         throw new Exception("Update should throw an exception");
     }
     catch (Exception e)
     {
         //then
         e.ShouldBeType<ArgumentNullException>();
     }
 }
 public async Task Update_WithInvalidFolderName_ThrowsException(FolderSyncanoClient client)
 {
     try
     {
         //when
         await client.Update(TestData.ProjectId, "abcde", TestData.CollectionId);
         throw new Exception("Update should throw an exception");
     }
     catch (Exception e)
     {
         //then
         e.ShouldBeType<SyncanoException>();
     }
 }
        public async Task Update_ByCollectionKey(FolderSyncanoClient client)
        {
            //given
            string folderName = "Test " + DateTime.Now.ToLongTimeString() + " " +
                                DateTime.Now.ToShortDateString();
            string newFolderName = "Update test " + DateTime.Now.ToLongTimeString() + " " +
                                DateTime.Now.ToShortDateString();
            await client.New(TestData.ProjectId, folderName, TestData.CollectionId);

            //when
            var result = await client.Update(TestData.ProjectId, folderName, null, TestData.CollectionKey, newFolderName,
                        "qwerty");

            //then
            result.ShouldBeTrue();

            //cleanup
            await client.Delete(TestData.ProjectId, newFolderName, collectionKey: TestData.CollectionKey);
        }