annotate env/lib/python3.9/site-packages/networkx/generators/tests/test_trees.py @ 0:4f3585e2f14b draft default tip

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author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 import networkx as nx
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2 from networkx.generators.trees import NIL
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3 from networkx.utils import arbitrary_element
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4
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5
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6 class TestPrefixTree:
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7 """Unit tests for the prefix tree generator function."""
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8
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9 def test_basic(self):
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10 # This example is from the Wikipedia article "Trie"
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11 # <https://en.wikipedia.org/wiki/Trie>.
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12 strings = ["a", "to", "tea", "ted", "ten", "i", "in", "inn"]
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13 T, root = nx.prefix_tree(strings)
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14
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15 def source_label(v):
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16 return T.nodes[v]["source"]
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17
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18 # First, we check that the tree has the expected
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19 # structure. Recall that each node that corresponds to one of
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20 # the input strings has an edge to the NIL node.
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21 #
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22 # Consider the three children at level 1 in the trie.
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23 a, i, t = sorted(T[root], key=source_label)
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24 # Check the 'a' branch.
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25 assert len(T[a]) == 1
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26 nil = arbitrary_element(T[a])
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27 assert len(T[nil]) == 0
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28 # Check the 'i' branch.
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29 assert len(T[i]) == 2
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30 nil, in_ = sorted(T[i], key=source_label)
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31 assert len(T[nil]) == 0
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32 assert len(T[in_]) == 2
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33 nil, inn = sorted(T[in_], key=source_label)
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34 assert len(T[nil]) == 0
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35 assert len(T[inn]) == 1
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36 nil = arbitrary_element(T[inn])
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37 assert len(T[nil]) == 0
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38 # Check the 't' branch.
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39 te, to = sorted(T[t], key=source_label)
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40 assert len(T[to]) == 1
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41 nil = arbitrary_element(T[to])
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42 assert len(T[nil]) == 0
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43 tea, ted, ten = sorted(T[te], key=source_label)
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44 assert len(T[tea]) == 1
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45 assert len(T[ted]) == 1
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46 assert len(T[ten]) == 1
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47 nil = arbitrary_element(T[tea])
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48 assert len(T[nil]) == 0
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49 nil = arbitrary_element(T[ted])
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50 assert len(T[nil]) == 0
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51 nil = arbitrary_element(T[ten])
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52 assert len(T[nil]) == 0
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53
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54 # Next, we check that the "sources" of each of the nodes is the
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55 # rightmost letter in the string corresponding to the path to
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56 # that node.
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57 assert source_label(root) is None
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58 assert source_label(a) == "a"
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59 assert source_label(i) == "i"
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60 assert source_label(t) == "t"
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61 assert source_label(in_) == "n"
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62 assert source_label(inn) == "n"
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63 assert source_label(to) == "o"
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64 assert source_label(te) == "e"
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65 assert source_label(tea) == "a"
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66 assert source_label(ted) == "d"
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67 assert source_label(ten) == "n"
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68 assert source_label(NIL) == NIL
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69
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70
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71 def test_random_tree():
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72 """Tests that a random tree is in fact a tree."""
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73 T = nx.random_tree(10, seed=1234)
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74 assert nx.is_tree(T)