use less test steps, add debug statements

.github/workflows/testing.yml

@@ -1,5 +1,5 @@
 name: crpropa-testing
-on: [push, pull_request]
+on: [pull_request]
 
 jobs:
   linux:

.github/workflows/testing_OSX.yaml

@@ -39,7 +39,7 @@ jobs:
          CRPROPA_DATA_PATH: "/Users/runner/work/CRPropa3/CRPropa3/build/data"
        run: |
          cd build
-         make test
+         ./testInteraciton
      - name: Archive test results
        if: always()
        uses: actions/upload-artifact@v3

.github/workflows/testing_ubuntu22.yml

@@ -1,5 +1,5 @@
 name: crpropa-testing_ubuntu22
-on: [push, pull_request]
+on: [pull_request]
 
 jobs:
   linux:

test/testInteraction.cpp

@@ -763,13 +763,16 @@ TEST(EMPairProduction, secondaries) {
 			if (c.isActive())
 				continue;
 
+			std::cout << "i = " << i << " has an inactive candidate with "  << c.secondaries.size() << "secondaries \n"; 
+
 			// expect 2 secondaries
 			EXPECT_EQ(c.secondaries.size(), 2);
 
 			// expect electron / positron with energies 0 < E < Ephoton
 			double Etot = 0;
 			for (int j = 0; j < c.secondaries.size(); j++) {
 				ref_ptr<Candidate> s = c.secondaries[j];
+				std::cout << "\t secondary #" << j << " works \n"; 
 				EXPECT_EQ(abs(s->current.getId()), 11);
 				EXPECT_GT(s->current.getEnergy(), 0);
 				EXPECT_LT(s->current.getEnergy(), Ep);