[include-cleaner] Add regression tests for outliving File&Source Manager

      PI.getExporters(llvm::cantFail(FM->getFileRef("foo.h")), *FM),

      testing::ElementsAre(llvm::cantFail(FM->getFileRef("exporter.h"))));

}

TEST_F(PragmaIncludeTest, OutlivesFMAndSM) {

  Inputs.Code = R"cpp(

    #include "public.h"

  )cpp";

  Inputs.ExtraFiles["public.h"] = R"cpp(

    #include "private.h"

    #include "private2.h" // IWYU pragma: export

  )cpp";

  Inputs.ExtraFiles["private.h"] = R"cpp(

    // IWYU pragma: private, include "public.h"

  )cpp";

  Inputs.ExtraFiles["private2.h"] = R"cpp(

    // IWYU pragma: private

  )cpp";

  build(); // Fills up PI, file/source manager used is destroyed afterwards.

  Inputs.MakeAction = nullptr; // Don't populate PI anymore.

  // Now this build gives us a new File&Source Manager.

  TestAST Processed = build();

  auto &FM = Processed.fileManager();

  auto PrivateFE = FM.getFile("private.h");

  assert(PrivateFE);

  EXPECT_EQ(PI.getPublic(PrivateFE.get()), "\"public.h\"");

  auto Private2FE = FM.getFile("private2.h");

  assert(Private2FE);

  EXPECT_THAT(PI.getExporters(Private2FE.get(), FM),

              testing::ElementsAre(llvm::cantFail(FM.getFileRef("public.h"))));

}

} // namespace

} // namespace clang::include_cleaner