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

"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/networkx/generators/tests/test_spectral_graph_forge.py	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,48 @@
+import pytest
+
+from networkx import is_isomorphic
+from networkx.exception import NetworkXError
+from networkx.testing import assert_nodes_equal
+from networkx.generators.spectral_graph_forge import spectral_graph_forge
+from networkx.generators import karate_club_graph
+
+
+def test_spectral_graph_forge():
+    numpy = pytest.importorskip("numpy")
+    scipy = pytest.importorskip("scipy")
+
+    G = karate_club_graph()
+
+    seed = 54321
+
+    # common cases, just checking node number preserving and difference
+    # between identity and modularity cases
+    H = spectral_graph_forge(G, 0.1, transformation="identity", seed=seed)
+    assert_nodes_equal(G, H)
+
+    I = spectral_graph_forge(G, 0.1, transformation="identity", seed=seed)
+    assert_nodes_equal(G, H)
+    assert is_isomorphic(I, H)
+
+    I = spectral_graph_forge(G, 0.1, transformation="modularity", seed=seed)
+    assert_nodes_equal(G, I)
+
+    assert not is_isomorphic(I, H)
+
+    # with all the eigenvectors, output graph is identical to the input one
+    H = spectral_graph_forge(G, 1, transformation="modularity", seed=seed)
+    assert_nodes_equal(G, H)
+    assert is_isomorphic(G, H)
+
+    # invalid alpha input value, it is silently truncated in [0,1]
+    H = spectral_graph_forge(G, -1, transformation="identity", seed=seed)
+    assert_nodes_equal(G, H)
+
+    H = spectral_graph_forge(G, 10, transformation="identity", seed=seed)
+    assert_nodes_equal(G, H)
+    assert is_isomorphic(G, H)
+
+    # invalid transformation mode, checking the error raising
+    pytest.raises(
+        NetworkXError, spectral_graph_forge, G, 0.1, transformation="unknown", seed=seed
+    )