adamdebreceni commented on a change in pull request #1090:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1090#discussion_r664399347



##########
File path: libminifi/test/rocksdb-tests/EncryptionTests.cpp
##########
@@ -0,0 +1,108 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "../TestBase.h"
+#include "utils/TestUtils.h"
+#include "FlowFileRepository.h"
+#include "utils/IntegrationTestUtils.h"
+
+using utils::Path;
+using core::repository::FlowFileRepository;
+
+class FFRepoFixture : public TestController {
+ public:
+  FFRepoFixture() {
+    LogTestController::getInstance().setDebug<minifi::FlowFileRecord>();
+    LogTestController::getInstance().setDebug<minifi::Connection>();
+    LogTestController::getInstance().setTrace<FlowFileRepository>();
+    home_ = createTempDirectory("/var/tmp/testRepo.XXXXXX");
+    repo_dir_ = home_ / "flowfile_repo";
+    checkpoint_dir_ = home_ / "checkpoint_dir";
+    config_ = std::make_shared<minifi::Configure>();
+    config_->setHome(home_.str());
+    container_ = std::make_shared<minifi::Connection>(nullptr, nullptr, 
"container");
+    content_repo_ = 
std::make_shared<core::repository::VolatileContentRepository>();
+    content_repo_->initialize(config_);
+  }
+
+  static void putFlowFile(const std::shared_ptr<minifi::FlowFileRecord>& 
flowfile, const std::shared_ptr<core::repository::FlowFileRepository>& repo) {
+    minifi::io::BufferStream buffer;
+    flowfile->Serialize(buffer);
+    REQUIRE(repo->Put(flowfile->getUUIDStr(), buffer.getBuffer(), 
buffer.size()));
+  }
+
+  template<typename Fn>
+  void runWithNewRepository(Fn&& fn) {
+    auto repository = std::make_shared<FlowFileRepository>("ff", 
checkpoint_dir_.str(), repo_dir_.str());
+    repository->initialize(config_);
+    std::map<std::string, std::shared_ptr<core::Connectable>> container_map;
+    container_map[container_->getUUIDStr()] = container_;
+    repository->setContainers(container_map);
+    repository->loadComponent(content_repo_);
+    repository->start();
+    std::forward<Fn>(fn)(repository);
+    repository->stop();
+  }
+
+ protected:
+  std::shared_ptr<minifi::Connection> container_;
+  Path home_;
+  Path repo_dir_;
+  Path checkpoint_dir_;
+  std::shared_ptr<minifi::Configure> config_;
+  std::shared_ptr<core::repository::VolatileContentRepository> content_repo_;
+};
+
+TEST_CASE_METHOD(FFRepoFixture, "FlowFileRepository creates checkpoint and 
loads flowfiles") {
+  SECTION("Without encryption") {
+    // pass
+  }
+  SECTION("With encryption") {
+    utils::file::FileUtils::create_dir((home_ / "conf").str());
+    std::ofstream{(home_ / "conf" / "bootstrap.conf").str()}
+      << static_cast<const char*>(FlowFileRepository::ENCRYPTION_KEY_NAME) << 
"="

Review comment:
       since we have an rvalue ref stream `operator<<` will resolve to a 
forwarding template function
   ```
   template <class _Stream, class _Tp>
   inline _LIBCPP_INLINE_VISIBILITY
   typename enable_if
   <
       !is_lvalue_reference<_Stream>::value &&
       is_base_of<ios_base, _Stream>::value,
       _Stream&&
   >::type
   operator<<(_Stream&& __os, const _Tp& __x)
   {
       __os << __x;
       return _VSTD::move(__os);
   }
   ```
   
   which takes the argument by reference, which makes the static member 
[odr-used](https://en.cppreference.com/w/cpp/language/definition#ODR-use), 
adding a `static_cast` makes an lvalue-to-rvalue conversion which evaluates to 
a constant expression, and no longer odr-used, from `c++17` we won't need this 
cast




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