Make csv test more verbose to debug GH Actions failure (fine on Mac…

… and Linux (Archer2) ??)

tests/test_chemical_potentials.py

@@ -329,7 +329,9 @@ def test_to_csv(self):
  reloaded_cpa = chemical_potentials.CompetingPhasesAnalyzer(self.stable_system)
  reloaded_cpa.from_csv("competing_phases.csv")
  reloaded_cpa_data = reloaded_cpa._get_and_sort_formation_energy_data()
- print(pd.DataFrame(stable_cpa_data), pd.DataFrame(reloaded_cpa_data)) # for debugging
+ print(
+ pd.DataFrame(stable_cpa_data).to_dict(), pd.DataFrame(reloaded_cpa_data).to_dict()
+ ) # for debugging
  assert pd.DataFrame(stable_cpa_data).equals(pd.DataFrame(reloaded_cpa_data))
 
  # check chem limits the same: