def test_accumulate_susceptibles():
v1 = Village(loc=(0.2, 0.3),
N=100,
vaccinated_fraction=0.2,
neighbors=set())
v1.S = 0 # start from transiently low susceptibles
n_generations = 26 * 300
S_timeseries = []
for t in range(n_generations):
v1.update()
S_timeseries.append(v1.S)
plt.plot(range(n_generations), S_timeseries)
