def test_ex1():
tt = Timetrip(2)
for w in '0 1 1\n0 1 3'.split('\n'):
tt.fill_graph(w)
solution = tt.solve()
assert solution == (1, 3)
def test_ex3():
tt = Timetrip(4)
for w in '0 2 0\n2 2 1\n2 1 0'.split('\n'):
tt.fill_graph(w)
solution = tt.solve()
assert solution == (0, 'INFINITY')
def test_ex2():
tt = Timetrip(4)
for w in '0 2 -7\n0 3 -4\n3 2 9\n2 1 3'.split('\n'):
tt.fill_graph(w)
solution = tt.solve()
assert solution == (-4, 8)
def test_minus_cycle2():
tt = Timetrip(4)
for w in '0 0 -2\n0 3 1\n2 3 1\n3 2 2\n2 1 0'.split('\n'):
tt.fill_graph(w)
dist, via = tt.floyd()
print(via)
assert tt.has_cycle(via) == True
solution = tt.solve()
assert solution == ('INFINITY', 'INFINITY')
def test_ex4_no_path():
tt = Timetrip(3)
solution = tt.solve()
assert solution == 'UNREACHABLE'
def test_minus_cycle():
tt = Timetrip(2)
for w in '0 1 -1\n1 0 -3'.split('\n'):
tt.fill_graph(w)
solution = tt.solve()