def test_model_save_only_aliases2(ms3, solver):
of = OutputFilter(only_aliases=True)
m1 = Model(ms3, historian_filter=of)
item = m1.search_items('2')[0]
columns_number = 0
for i, var in enumerate(item.get_variables()):
var[0].alias = str(i)
columns_number += 1
s1 = Simulation(m1, t_start=0, t_stop=1000, num=10, solver_type=solver)
s1.solve()
assert m1.historian_df.columns.size == columns_number
def test_1_item_model(ms1):
m1 = Model(ms1)
item = m1.search_items('test_item')[0]
assert item.t1.P.value == 100