Add tests exporters

soil/exporters.py

@@ -21,6 +21,7 @@ def for_sim(simulation, names, *args, **kwargs):
         exporters.append(mod(simulation, *args, **kwargs))
     return exporters
 
+
 class DryRunner(BytesIO):
     def __init__(self, fname, *args, copy_to=None, **kwargs):
         super().__init__(*args, **kwargs)