diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 62c9504c5dbf750ad5f7165d6261e3e7c6fed3d2..ecb011e99179399e62f646f3027951aff0163466 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -24,6 +24,7 @@
 set(test_cases
     test_connection
     test_transaction
+	#test_file_transmission TODO add once fixed
     test_ccaosdb
     )
 
diff --git a/test/test_file_transmission.cpp b/test/test_file_transmission.cpp
index 7c6a72d0b4d52ecd76d01d253e377473ce7954cf..fb42d893783534097f834235d4cfaba789f37c8d 100644
--- a/test/test_file_transmission.cpp
+++ b/test/test_file_transmission.cpp
@@ -36,6 +36,12 @@ using caosdb::entity::v1alpha1::RegisterFileUploadResponse;
 using caosdb::entity::v1alpha1::RegistrationStatus;
 using caosdb::entity::v1alpha1::TransmissionStatus;
 
+
+// TODO(tf) this file is currently not used (see CMakeLists.txt)
+// Is it still necessary or is it obsolete due to test_transaction.cpp?
+// RegisterFileDownloadResponse is currently not defined by proto or the h
+// file.
+
 class test_file_transmission : public ::testing::Test {
 protected:
   void SetUp() override {}
diff --git a/test/test_transaction.cpp b/test/test_transaction.cpp
index e51ccd6d0c03691b3067f3f4e522dc29a1419356..a3182843d81520a91e8f4932bb1f023172a98d4a 100644
--- a/test/test_transaction.cpp
+++ b/test/test_transaction.cpp
@@ -20,6 +20,7 @@
  */
 #include "caosdb/connection.h" // for Connection, ConnectionManager
 #include "caosdb/entity.h"     // for Entity, Messages, Message
+#include "caosdb/file_transmission/file_reader.h" // for FileReader
 #include "caosdb/file_transmission/file_writer.h" // for FileWriter
 #include "caosdb/message_code.h"       // for ENTITY_DOES_NOT_EXIST, Messag...
 #include "caosdb/status_code.h"        // for SUCCESS, StatusCode
@@ -690,9 +691,18 @@ TEST_F(test_transaction, test_file_upload) {
   const auto &inserted_file = insert_results.at(0);
   EXPECT_FALSE(inserted_file.GetId().empty());
   EXPECT_FALSE(inserted_file.HasErrors());
+
+  // Check file once more
+  auto count_query(connection->CreateTransaction());
+  count_query->Query("COUNT FILE WHICH IS STORED AT 'test.txt'");
+  count_query->ExecuteAsynchronously();
+  auto count_and_retrieve_status = count_query->WaitForIt();
+  ASSERT_TRUE(count_and_retrieve_status.IsTerminated());
+  ASSERT_FALSE(count_and_retrieve_status.IsError());
+  EXPECT_EQ(count_query->GetCountResult(), 1);
 }
 
-TEST_F(test_transaction, test_file_download) {
+TEST_F(test_transaction, test_file_up_n_download) {
   const auto &connection =
     caosdb::connection::ConnectionManager::GetDefaultConnection();
 
@@ -725,6 +735,14 @@ TEST_F(test_transaction, test_file_download) {
   ASSERT_FALSE(downloaded_file.HasErrors());
   EXPECT_EQ(downloaded_file.GetLocalPath().string(),
             test_download_file_1.string());
+
+  FileReader reader_remote(test_upload_file_1);
+  std::string buffer_local(1024, 'c');
+  std::string buffer_remote(1024, 'c');
+  for (int i = 0; i < 8; i++) {
+    reader_remote.read(buffer_remote);
+    EXPECT_EQ(buffer_remote, buffer_local);
+  }
 }
 
 } // namespace caosdb::transaction