def test_accepts_store_size_three_list():
db.clear_sparse_matrix()
l = [3, 4, 5]
db.store_tuple(4, 5, l)
assert l == db.get_tuple(4, 5)
def test_stored_cell_in_sparse_matrix_is_a_size_three_list():
db.clear_sparse_matrix()
db.store_tuple(3, 4, [2, 3, 4])
t = db.get_tuple(3, 4)
assert isinstance(t, list)
assert 3 == len(t)
def test_read_sparse_matrix_tuple_out_of_range_returns_None():
db.clear_sparse_matrix()
assert None == db.get_tuple(3, 4)
def test_accepts_store_None():
db.clear_sparse_matrix()
db.store_tuple(4, 5, None)
assert None == db.get_tuple(4, 5)
