TST: check empty file"

test/test_transaction.cpp

@@ -94,6 +94,7 @@ public:
 
 protected:
   fs::path test_upload_file_1;
+  fs::path test_empty_file_1;
   fs::path test_download_file_1;
 
   // Fixture methods //////////////////////////////////////////////////////////
@@ -102,6 +103,7 @@ protected:
     DeleteEntities();
 
     test_upload_file_1 = fs::path("test_upload_file_1_delete_me.dat");
+    test_empty_file_1 = fs::path("test_empty_file_1_delete_me.dat");
     test_download_file_1 = fs::path("test_download_file_1_delete_me.dat");
 
     // fill the file that shall be uploaded
@@ -115,6 +117,7 @@ protected:
   void TearDown() override {
     // delete files
     fs::remove(test_upload_file_1);
+    //fs::remove(test_empty_file_1);
     fs::remove(test_download_file_1);
     DeleteEntities();
   }
@@ -955,13 +958,54 @@ TEST_F(test_transaction, test_file_up_n_download) {
 
   FileReader reader_remote(test_upload_file_1);
   std::string buffer_local(1024, 'c');
-  std::string buffer_remote(1024, 'c');
+  std::string buffer_remote(1024, '0');
   for (int i = 0; i < 8; i++) {
     reader_remote.read(buffer_remote);
     EXPECT_EQ(buffer_remote, buffer_local);
   }
 }
 
+/*
+ * create a file object, upload and then download it
+ */
+TEST_F(test_transaction, test_empyt_file) {
+  const auto &connection =
+      caosdb::connection::ConnectionManager::GetDefaultConnection();
+
+  Entity file;
+  file.SetRole(Role::FILE);
+  file.SetFilePath("test.txt");
+  file.SetLocalPath(test_empty_file_1);
+
+  auto insert_transaction(connection->CreateTransaction());
+  insert_transaction->InsertEntity(&file);
+  insert_transaction->Execute();
+
+  const auto &insert_results = insert_transaction->GetResultSet();
+
+  const auto &inserted_file = insert_results.at(0);
+  ASSERT_FALSE(inserted_file.GetId().empty());
+  ASSERT_FALSE(inserted_file.HasErrors());
+
+  auto download_transaction(connection->CreateTransaction());
+  download_transaction->RetrieveAndDownloadFileById(
+      inserted_file.GetId(), test_download_file_1.string());
+  download_transaction->ExecuteAsynchronously();
+  ASSERT_EQ(download_transaction->WaitForIt().GetCode(), StatusCode::SUCCESS);
+
+  const auto &download_results = download_transaction->GetResultSet();
+  ASSERT_EQ(download_results.size(), 1);
+
+  const auto &downloaded_file = download_results.at(0);
+  ASSERT_FALSE(downloaded_file.GetId().empty());
+  ASSERT_FALSE(downloaded_file.HasErrors());
+  EXPECT_EQ(downloaded_file.GetLocalPath().string(),
+            test_download_file_1.string());
+
+	//checkfile size??/
+}
+
+
 /*
  * Test a small worklfow
  */