rearrange test to use a pytest.fixture

src/synergia/simulation/tests/test_iota_elem_lengths.py

@@ -365,7 +365,8 @@
 ################################################################################
 
 
-def get_lattice():
+@pytest.fixture
+def lattice_fixture():
  # read the lattice in from a MadX sequence file
 
  reader = synergia.lattice.MadX_reader()
@@ -396,9 +397,8 @@ def get_propagator(lattice):
 
 ################################################################################
 
-def test_elem_lengths():
- # get the lattice
- lattice = get_lattice()
+def test_elem_lengths(lattice_fixture):
+ lattice = lattice_fixture
  lattice_length = lattice.get_length()
 
  refpart = lattice.get_reference_particle()
@@ -459,7 +459,8 @@ def step_end_action(sim, inlattice, turn, step):
  assert element_lengths[i] == pytest.approx(context.elem_cdt[i]*beta)
 
 def main():
- test_elem_lengths()
+ lf = lattice_fixture()
+ test_elem_lengths(lf)
 
 if __name__ == "__main__":
  main()