add macro in tests

Author: Chiara De Martin

MC/config/PWGLF/ini/GeneratorDoubleLambdaTriggered.ini

@@ -1,6 +1,5 @@
 [GeneratorExternal]
 fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGLF/pythia8/generator_pythia8_doubleLambdas.C
-#fileName=/home/chdemart/O2Container/O2DPG/MC/config/PWGLF/pythia8/generator_pythia8_doubleLambdas.C
 funcName=generateDoubleLambda(4, 0.2, 10, 0.8)
 
 [GeneratorPythia8] 

MC/config/PWGLF/ini/tests/GeneratorDoubleLambdaTriggered.C

@@ -0,0 +1,25 @@
+int External() {
+  std::string path{"o2sim_Kine.root"};
+
+  TFile file(path.c_str(), "READ");
+  if (file.IsZombie()) {
+    std::cerr << "Cannot open ROOT file " << path << "\n";
+    return 1;
+  }
+
+  auto tree = (TTree *)file.Get("o2sim");
+  if (!tree) {
+    std::cerr << "Cannot find tree o2sim in file " << path << "\n";
+    return 1;
+  }
+  std::vector<o2::MCTrack> *tracks{};
+  tree->SetBranchAddress("MCTrack", &tracks);
+
+  auto nLambda = tree->Scan("MCTrack.GetPdgCode()", "TMath::Abs(MCTrack.GetPdgCode()) == 3122");
+    
+  if (nLambda == 0) {
+    std::cerr << "No event of interest\n";
+    return 1;
+  }
+  return 0;
+}