[TTreeProcessorMT][ROOT-9948] Add test

tree/treeplayer/test/treeprocmt/treeprocessormt.cxx

@@ -170,4 +170,16 @@ TEST(TreeProcessorMT, MaxTasks)
 
    gSystem->Unlink(filename);
    ROOT::DisableImplicitMT();
-}
\ No newline at end of file
+}
+
+TEST(TreeProcessorMT, PathName)
+{
+   auto fname = "root://eospublic.cern.ch//eos/root-eos/cms_opendata_2012_nanoaod/ZZTo4mu.root";
+   auto f = std::unique_ptr<TFile>(TFile::Open(fname));
+   auto tree = f->Get<TTree>("Events");
+   ROOT::TTreeProcessorMT p(*tree);
+   std::atomic<unsigned int> n (0U);
+   auto func = [&n](TTreeReader &t) { while (t.Next()) n++;};
+   p.Process(func);
+   EXPECT_EQ(n.load(), 1499064U) << "Wrong number of events processed!\n";
+}