diff --git a/tests/test_benchmark_chart.py b/tests/test_benchmark_chart.py
new file mode 100644
index 0000000..04f5ae6
--- /dev/null
+++ b/tests/test_benchmark_chart.py
@@ -0,0 +1,66 @@
+import json
+from pathlib import Path
+from typing import Any, Callable
+
+import pytest
+
+
+ROOT = Path(__file__).resolve().parents[1]
+DATA_PATH = ROOT / "benchmarks" / "source_review.json"
+
+
+def _renderer_api() -> tuple[Callable[[Path], dict[str, Any]], Callable[..., None]]:
+    try:
+        from benchmarks.render_chart import load_benchmark, render_chart
+    except ModuleNotFoundError:
+        pytest.fail("benchmarks.render_chart is not implemented")
+    return load_benchmark, render_chart
+
+
+def test_source_review_contract_is_complete() -> None:
+    load_benchmark, _ = _renderer_api()
+    raw = json.loads(DATA_PATH.read_text(encoding="utf-8"))
+    data = load_benchmark(DATA_PATH)
+
+    assert data == raw
+    assert data["schema_version"] == "1.0"
+    assert sum(item["weight"] for item in data["rubric"]) == 100
+    assert data["evidence_boundary"] == "source_review_not_shared_live_run"
+
+    projects = data["projects"]
+    repositories = [item["repository"] for item in projects]
+    assert len(repositories) == len(set(repositories))
+    assert "U-C4N/Autocad-MCP" in repositories
+    assert "varavista/autocad-mcp" in repositories
+    assert "beiming183-cloud/AutoCAD-MCP" in repositories
+    assert "AnCode666/multiCAD-mcp" in repositories
+    assert "puran-water/autocad-mcp" in repositories
+    assert "NCO-1986/AutoCAD_mcp" in repositories
+    assert all(0 <= item["score"] <= 100 for item in projects)
+    assert all(item["evidence_grade"] in {"A", "B", "C"} for item in projects)
+
+
+def test_load_benchmark_rejects_duplicate_repositories(tmp_path: Path) -> None:
+    load_benchmark, _ = _renderer_api()
+    payload = json.loads(DATA_PATH.read_text(encoding="utf-8"))
+    payload["projects"].append(payload["projects"][0].copy())
+    invalid = tmp_path / "duplicate.json"
+    invalid.write_text(json.dumps(payload), encoding="utf-8")
+
+    with pytest.raises(ValueError, match="duplicate repository"):
+        load_benchmark(invalid)
+
+
+def test_render_chart_writes_readable_svg(tmp_path: Path) -> None:
+    load_benchmark, render_chart = _renderer_api()
+    pytest.importorskip("matplotlib")
+    data = load_benchmark(DATA_PATH)
+    output = tmp_path / "benchmark.svg"
+
+    render_chart(data, output)
+
+    svg = output.read_text(encoding="utf-8")
+    assert svg.lstrip().startswith("<?xml")
+    assert "Source-reviewed capability benchmark" in svg
+    assert "U-C4N/Autocad-MCP" in svg
+    assert "Shared live-run results are not implied" in svg