test(rack): guard empty rack value and cover 0U/both/multi-rack rendering

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/gen_rack.py

@@ -73,6 +73,9 @@ def load_rack_items(hardware_dir: Path) -> list[dict]:
 
 def validate_item(fm: dict) -> None:
     name = fm.get("hostname") or fm.get("_path", "?")
+    rack = fm.get("rack")
+    if not isinstance(rack, str) or not rack:
+        raise SchemaError(f"{name}: rack must be a non-empty string")
     face = fm.get("rack_face")
     if face not in FACES:
         raise SchemaError(f"{name}: rack_face={face!r} not in {sorted(FACES)}")

tests/test_gen_rack.py

@@ -42,6 +42,11 @@ def test_validate_rejects_missing_units_on_faced_item():
         gen_rack.validate_item(item(rack_face="front"))
 
 
+def test_validate_rejects_empty_rack():
+    with pytest.raises(gen_rack.SchemaError):
+        gen_rack.validate_item(item(rack=None, rack_u=1, u_height=1, rack_face="front"))
+
+
 def test_overlaps_detects_same_face_overlap():
     items = [
         item(hostname="a", rack_u=1, u_height=2, rack_face="front"),
@@ -135,6 +140,42 @@ def test_generate_writes_artifacts(tmp_path):
     assert "mf00" in (out / "rack01-elevation.svg").read_text()
 
 
+def test_render_svg_draws_zero_u_rail():
+    items = [item(hostname="pdu01", kind="pdu", rack_face="left")]
+    svg = gen_rack.render_svg("rack01", items)
+    assert "pdu01" in svg
+    assert "rotate(-90" in svg
+
+
+def test_render_svg_both_face_draws_in_both_columns():
+    items = [item(hostname="dev", rack_u=10, u_height=1, rack_face="both")]
+    svg = gen_rack.render_svg("rack01", items)
+    assert svg.count("dev (U10)") == 2
+
+
+def test_generate_writes_one_pair_per_rack(tmp_path):
+    hw = tmp_path / "hardware"
+    out = tmp_path / "out"
+    hw.mkdir()
+    _write_item(
+        hw,
+        "a",
+        "---\nhostname: a\nkind: server\nstatus: in-use\n"
+        "rack: rack01\nrack_u: 1\nu_height: 1\nrack_face: front\n---\n",
+    )
+    _write_item(
+        hw,
+        "b",
+        "---\nhostname: b\nkind: server\nstatus: in-use\n"
+        "rack: rack02\nrack_u: 1\nu_height: 1\nrack_face: front\n---\n",
+    )
+    rc = gen_rack.generate(hw, out)
+    assert rc == 0
+    assert (out / "rack01.md").exists() and (out / "rack02.md").exists()
+    assert (out / "rack01-elevation.svg").exists()
+    assert (out / "rack02-elevation.svg").exists()
+
+
 def test_generate_returns_1_on_overlap(tmp_path):
     hw = tmp_path / "hardware"
     out = tmp_path / "out"