110 lines
3.5 KiB
Python
110 lines
3.5 KiB
Python
# Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
from typing import Dict, Iterable, List, Sequence
|
|
|
|
from synapse.util.iterutils import chunk_seq, sorted_topologically
|
|
|
|
from tests.unittest import TestCase
|
|
|
|
|
|
class ChunkSeqTests(TestCase):
|
|
def test_short_seq(self):
|
|
parts = chunk_seq("123", 8)
|
|
|
|
self.assertEqual(
|
|
list(parts),
|
|
["123"],
|
|
)
|
|
|
|
def test_long_seq(self):
|
|
parts = chunk_seq("abcdefghijklmnop", 8)
|
|
|
|
self.assertEqual(
|
|
list(parts),
|
|
["abcdefgh", "ijklmnop"],
|
|
)
|
|
|
|
def test_uneven_parts(self):
|
|
parts = chunk_seq("abcdefghijklmnop", 5)
|
|
|
|
self.assertEqual(
|
|
list(parts),
|
|
["abcde", "fghij", "klmno", "p"],
|
|
)
|
|
|
|
def test_empty_input(self):
|
|
parts: Iterable[Sequence] = chunk_seq([], 5)
|
|
|
|
self.assertEqual(
|
|
list(parts),
|
|
[],
|
|
)
|
|
|
|
|
|
class SortTopologically(TestCase):
|
|
def test_empty(self):
|
|
"Test that an empty graph works correctly"
|
|
|
|
graph: Dict[int, List[int]] = {}
|
|
self.assertEqual(list(sorted_topologically([], graph)), [])
|
|
|
|
def test_handle_empty_graph(self):
|
|
"Test that a graph where a node doesn't have an entry is treated as empty"
|
|
|
|
graph: Dict[int, List[int]] = {}
|
|
|
|
# For disconnected nodes the output is simply sorted.
|
|
self.assertEqual(list(sorted_topologically([1, 2], graph)), [1, 2])
|
|
|
|
def test_disconnected(self):
|
|
"Test that a graph with no edges work"
|
|
|
|
graph: Dict[int, List[int]] = {1: [], 2: []}
|
|
|
|
# For disconnected nodes the output is simply sorted.
|
|
self.assertEqual(list(sorted_topologically([1, 2], graph)), [1, 2])
|
|
|
|
def test_linear(self):
|
|
"Test that a simple `4 -> 3 -> 2 -> 1` graph works"
|
|
|
|
graph: Dict[int, List[int]] = {1: [], 2: [1], 3: [2], 4: [3]}
|
|
|
|
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
|
|
|
|
def test_subset(self):
|
|
"Test that only sorting a subset of the graph works"
|
|
graph: Dict[int, List[int]] = {1: [], 2: [1], 3: [2], 4: [3]}
|
|
|
|
self.assertEqual(list(sorted_topologically([4, 3], graph)), [3, 4])
|
|
|
|
def test_fork(self):
|
|
"Test that a forked graph works"
|
|
graph: Dict[int, List[int]] = {1: [], 2: [1], 3: [1], 4: [2, 3]}
|
|
|
|
# Valid orderings are `[1, 3, 2, 4]` or `[1, 2, 3, 4]`, but we should
|
|
# always get the same one.
|
|
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
|
|
|
|
def test_duplicates(self):
|
|
"Test that a graph with duplicate edges work"
|
|
graph: Dict[int, List[int]] = {1: [], 2: [1, 1], 3: [2, 2], 4: [3]}
|
|
|
|
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
|
|
|
|
def test_multiple_paths(self):
|
|
"Test that a graph with multiple paths between two nodes work"
|
|
graph: Dict[int, List[int]] = {1: [], 2: [1], 3: [2], 4: [3, 2, 1]}
|
|
|
|
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
|