additional filesystem abstractions

unittests/cfdp/handler/testDestHandler.cpp

@@ -56,7 +56,7 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
   }
 
   SECTION("Empty File Transfer") {
-    const DestFsmResult& res = destHandler.performStateMachine();
+    const DestHandler::FsmResult& res = destHandler.performStateMachine();
     CHECK(res.result == OK);
     FileSize size(0);
     std::string srcNameString = "hello.txt";
@@ -76,6 +76,8 @@ TEST_CASE("CFDP Dest Handler", "[cfdp]") {
     packetInfoList.push_back(packetInfo);
     destHandler.performStateMachine();
     CHECK(res.result == OK);
+    CHECK(res.callStatus == CallStatus::CALL_AGAIN);
+    destHandler.performStateMachine();
   }
 
   SECTION("Small File Transfer") {}

unittests/mocks/FilesystemMock.cpp

@@ -124,3 +124,17 @@ void FilesystemMock::reset() {
   std::queue<RenameInfo> empty;
   std::swap(renameQueue, empty);
 }
+
+bool FilesystemMock::fileExists(FilesystemParams params) {
+  std::string filename(params.path);
+  auto iter = fileMap.find(filename);
+  if (iter == fileMap.end()) {
+    return false;
+  }
+  return true;
+}
+
+ReturnValue_t FilesystemMock::truncateFile(FilesystemParams params) {
+  truncateCalledOnFile = params.path;
+  return returnvalue::OK;
+}

unittests/mocks/FilesystemMock.h

@@ -53,8 +53,12 @@ class FilesystemMock : public HasFileSystemIF {
     std::string newName;
   };
   std::queue<RenameInfo> renameQueue;
-
+  std::string truncateCalledOnFile;
   ReturnValue_t feedFile(const std::string &filename, std::ifstream &file);
+
+  bool fileExists(FilesystemParams params) override;
+  ReturnValue_t truncateFile(FilesystemParams params) override;
+
   ReturnValue_t writeToFile(FileOpParams params, const uint8_t *data) override;
   ReturnValue_t readFromFile(FileOpParams params, uint8_t **buffer, size_t &readSize,
                              size_t maxSize) override;