================
@@ -26,4 +57,37 @@ TEST(SerializationFormatRegistryTest, 
EnumeratingRegistryEntries) {
   EXPECT_EQ(Formats.begin()->getName(), "MockSerializationFormat");
 }
 
+TEST(SerializationFormatRegistryTest, Roundtrip) {
+  StringLiteral FancyAnalysisFileData = "FancyAnalysisData{\n"
+                                        "  SomeInternalList: zed, vayne, lux\n"
+                                        "}\n";
+
+  auto Inputs = makeIntrusiveRefCnt<vfs::InMemoryFileSystem>();
+  Inputs->addFile("input/analyses.txt", /*ModificationTime=*/{},
+                  MemoryBuffer::getMemBufferCopy("FancyAnalysis\n"));
+  Inputs->addFile("input/FancyAnalysis.special", /*ModificationTime=*/{},
+                  MemoryBuffer::getMemBufferCopy(FancyAnalysisFileData));
+
+  std::unique_ptr<SerializationFormat> Format =
+      makeFormat(Inputs, "MockSerializationFormat");
+  ASSERT_TRUE(Format);
+
+  TUSummary LoadedSummary = Format->readTUSummary("input");
+
+  // Create a temporary output directory
+  SmallString<128> OutputDir;
+  std::error_code EC = sys::fs::createUniqueDirectory("ssaf-test", OutputDir);
----------------
aviralg wrote:

I realized we are using InMemoryFileSystem here because this tests both the 
feature introduced in this PR and 
https://github.com/llvm/llvm-project/pull/179516. I guess it can stay.

https://github.com/llvm/llvm-project/pull/179517
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