Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/utils/tests/test_unionfind.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import networkx as nx |
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2 |
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3 |
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4 def test_unionfind(): |
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5 # Fixed by: 2cddd5958689bdecdcd89b91ac9aaf6ce0e4f6b8 |
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6 # Previously (in 2.x), the UnionFind class could handle mixed types. |
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7 # But in Python 3.x, this causes a TypeError such as: |
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8 # TypeError: unorderable types: str() > int() |
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9 # |
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10 # Now we just make sure that no exception is raised. |
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11 x = nx.utils.UnionFind() |
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12 x.union(0, "a") |
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13 |
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14 |
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15 def test_subtree_union(): |
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16 # See https://github.com/networkx/networkx/pull/3224 |
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17 # (35db1b551ee65780794a357794f521d8768d5049). |
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18 # Test if subtree unions hare handled correctly by to_sets(). |
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19 uf = nx.utils.UnionFind() |
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20 uf.union(1, 2) |
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21 uf.union(3, 4) |
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22 uf.union(4, 5) |
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23 uf.union(1, 5) |
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24 assert list(uf.to_sets()) == [{1, 2, 3, 4, 5}] |
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25 |
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26 |
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27 def test_unionfind_weights(): |
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28 # Tests if weights are computed correctly with unions of many elements |
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29 uf = nx.utils.UnionFind() |
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30 uf.union(1, 4, 7) |
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31 uf.union(2, 5, 8) |
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32 uf.union(3, 6, 9) |
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33 uf.union(1, 2, 3, 4, 5, 6, 7, 8, 9) |
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34 assert uf.weights[uf[1]] == 9 |
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35 |
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36 |
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37 def test_empty_union(): |
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38 # Tests if a null-union does nothing. |
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39 uf = nx.utils.UnionFind((0, 1)) |
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40 uf.union() |
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41 assert uf[0] == 0 |
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42 assert uf[1] == 1 |