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test(merge): pin same-order community-offset byte-reproducibility (#3014)

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Document that the per-input community-id offset is deterministic for a fixed input order
(consumers rely on stable merged output), while noting the offsets are position-dependent
by design.
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safishamsi
2026-08-25 18:09:58 +01:00
parent 4e2e23278a
commit ef00185bb2
1 changed files with 17 additions and 0 deletions
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tests/test_merge_graphs_cli.py
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@@ -287,3 +287,20 @@ def test_merge_graphs_offsets_communities_so_repos_do_not_fuse(tmp_path):
assert len({n["community"] for n in data["nodes"]}) == 5
# the per-repo partition is preserved
assert {n["local_community"] for n in b_nodes} == {0, 1, 2}
def test_merge_graphs_community_offset_is_byte_reproducible(tmp_path):
"""For a FIXED input order, the offset assignment must be deterministic:
merging the same inputs twice produces byte-identical output. (Offsets are
position-dependent by design — reordering inputs may renumber — so this pins
only same-order reproducibility, which is what consumers rely on. #3014.)"""
a = tmp_path / "alpha" / "graphify-out" / "graph.json"
b = tmp_path / "beta" / "graphify-out" / "graph.json"
_write_with_communities(a, [("a0", 0), ("a1", 0), ("a2", 1)])
_write_with_communities(b, [("b0", 0), ("b1", 1), ("b2", 2)])
out1 = tmp_path / "m1.json"
out2 = tmp_path / "m2.json"
assert _run(["merge-graphs", str(a), str(b), "--out", str(out1)], tmp_path).returncode == 0
assert _run(["merge-graphs", str(a), str(b), "--out", str(out2)], tmp_path).returncode == 0
assert out1.read_bytes() == out2.read_bytes(), "same-order merge is not byte-reproducible"