File size: 3,323 Bytes
3fbbaab 11757ce 7609903 3fbbaab 11757ce 3fbbaab 11757ce | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | """Regression tests for P2-15: graph.json deserialization integrity."""
import json
import sys
from pathlib import Path
import networkx as nx
sys.path.insert(0, str(Path(__file__).parent.parent))
from ctx.core.graph import resolve_graph
def _write_graph_file(tmp_path: Path, content: bytes | str) -> Path:
p = tmp_path / "graph.json"
if isinstance(content, str):
p.write_text(content, encoding="utf-8")
else:
p.write_bytes(content)
return p
class TestLoadGraphIntegrity:
"""load_graph must return an empty graph rather than raise on bad input."""
def test_file_not_found_returns_empty_graph(self, tmp_path):
missing = tmp_path / "nonexistent" / "graph.json"
G = resolve_graph.load_graph(path=missing)
assert isinstance(G, nx.Graph)
assert G.number_of_nodes() == 0
def test_invalid_encoding_returns_empty_graph(self, tmp_path):
"""File with non-UTF-8 bytes must not raise; returns empty graph."""
p = _write_graph_file(tmp_path, b"\xff\xfe{bad encoding\x00")
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_truncated_json_returns_empty_graph(self, tmp_path):
p = _write_graph_file(tmp_path, '{"nodes": [{"id": "skill:foo"')
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_missing_nodes_key_returns_empty_graph(self, tmp_path):
# Has 'links' but not 'nodes'
data = json.dumps({"links": []})
p = _write_graph_file(tmp_path, data)
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_missing_links_key_returns_empty_graph(self, tmp_path):
# Has 'nodes' but not 'links'
data = json.dumps({"nodes": []})
p = _write_graph_file(tmp_path, data)
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_wrong_schema_type_returns_empty_graph(self, tmp_path):
# Root is a list, not a dict
data = json.dumps([{"id": "skill:foo"}])
p = _write_graph_file(tmp_path, data)
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_null_json_returns_empty_graph(self, tmp_path):
p = _write_graph_file(tmp_path, "null")
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 0
def test_valid_graph_loads_correctly(self, tmp_path):
"""A conforming graph.json must load with the correct node count."""
# Use node_link_data to generate a valid fixture for the installed networkx version
import networkx as nx
from networkx.readwrite import node_link_data
G_src = nx.Graph()
G_src.add_node("skill:fastapi-pro", label="fastapi-pro", type="skill", tags=["python"])
G_src.add_node("skill:docker-expert", label="docker-expert", type="skill", tags=["docker"])
G_src.add_edge("skill:fastapi-pro", "skill:docker-expert", weight=1.0)
data = node_link_data(G_src)
p = _write_graph_file(tmp_path, json.dumps(data))
G = resolve_graph.load_graph(path=p)
assert G.number_of_nodes() == 2
assert G.number_of_edges() == 1
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