two version of R2R are hereHEADmaster

1 files changed, 31 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/networkx/algorithms/approximation/tests/test_ramsey.py b/.venv/lib/python3.12/site-packages/networkx/algorithms/approximation/tests/test_ramsey.py
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+++ b/.venv/lib/python3.12/site-packages/networkx/algorithms/approximation/tests/test_ramsey.py
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+import networkx as nx
+import networkx.algorithms.approximation as apxa
+
+
+def test_ramsey():
+    # this should only find the complete graph
+    graph = nx.complete_graph(10)
+    c, i = apxa.ramsey_R2(graph)
+    cdens = nx.density(graph.subgraph(c))
+    assert cdens == 1.0, "clique not correctly found by ramsey!"
+    idens = nx.density(graph.subgraph(i))
+    assert idens == 0.0, "i-set not correctly found by ramsey!"
+
+    # this trivial graph has no cliques. should just find i-sets
+    graph = nx.trivial_graph()
+    c, i = apxa.ramsey_R2(graph)
+    assert c == {0}, "clique not correctly found by ramsey!"
+    assert i == {0}, "i-set not correctly found by ramsey!"
+
+    graph = nx.barbell_graph(10, 5, nx.Graph())
+    c, i = apxa.ramsey_R2(graph)
+    cdens = nx.density(graph.subgraph(c))
+    assert cdens == 1.0, "clique not correctly found by ramsey!"
+    idens = nx.density(graph.subgraph(i))
+    assert idens == 0.0, "i-set not correctly found by ramsey!"
+
+    # add self-loops and test again
+    graph.add_edges_from([(n, n) for n in range(0, len(graph), 2)])
+    cc, ii = apxa.ramsey_R2(graph)
+    assert cc == c
+    assert ii == i