v1.2.0

Adds production-grade engineering features and tools: 2D GD&T (feature control frames + datum features) via engineering/gdt.py, ISO‑129 dimension tolerance support (engineering/tolerances.py) and an ezdxf/COM plumbing for toleranced dims, a scalar drawing score + invalidity ratio (engineering/scoring.py) wired into drawing_finalize, in-place entity editors (entity_edit_text/entity_edit_geometry), and a friendly drawing_settings facade. Includes server tool wiring, COM/ezdxf backend implementations, datum-consistency critique, many unit tests, README/CLAUDE/CHANGELOG updates, and a version bump to 1.2.0. Also corrects COM backend capability label (entities_2d).

tests/test_drawing_settings.py

@@ -0,0 +1,75 @@
+"""Tests for the drawing_settings facade — friendly read/change of AutoCAD
+system variables (units, precision, scales, osnap, …)."""
+
+from __future__ import annotations
+
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_read_snapshot_returns_known_keys(backend):
+    snap = await backend.drawing_settings()
+    assert snap["ok"] is True
+    s = snap["settings"]
+    for key in ("units", "linear_precision", "ltscale", "dimscale", "osmode"):
+        assert key in s
+
+
+async def test_set_and_read_back_units_by_name(backend):
+    res = await backend.drawing_settings({"units": "mm"})
+    assert res["ok"] is True
+    assert res["applied"]["units"] == "mm"
+    snap = await backend.drawing_settings()
+    assert snap["settings"]["units"]["name"] == "mm"
+    assert snap["settings"]["units"]["code"] == 4
+
+
+async def test_set_units_cm_and_inch_codes(backend):
+    await backend.drawing_settings({"units": "cm"})
+    assert (await backend.drawing_settings())["settings"]["units"]["code"] == 5
+    await backend.drawing_settings({"units": "inch"})
+    assert (await backend.drawing_settings())["settings"]["units"]["code"] == 1
+
+
+async def test_set_numeric_settings(backend):
+    res = await backend.drawing_settings({
+        "dimscale": 2.0, "linear_precision": 3, "ltscale": 0.5,
+    })
+    assert res["ok"] is True
+    snap = (await backend.drawing_settings())["settings"]
+    assert snap["dimscale"] == 2.0
+    assert snap["linear_precision"] == 3
+    assert snap["ltscale"] == 0.5
+
+
+async def test_unknown_key_reports_error_without_failing_others(backend):
+    res = await backend.drawing_settings({"dimscale": 1.5, "bogus_key": 1})
+    assert res["applied"]["dimscale"] == 1.5
+    assert "bogus_key" in res["errors"]
+    assert res["ok"] is False
+
+
+async def test_bad_unit_value_is_reported(backend):
+    res = await backend.drawing_settings({"units": "furlongs"})
+    assert "units" in res["errors"]
+
+
+# ── server tool wiring ──────────────────────────────────────────────────────
+
+class _FakeCtx:
+    def __init__(self, backend):
+        self.lifespan_context = {"backend": backend}
+
+    async def info(self, *a, **k):
+        pass
+
+
+async def test_server_tool_reads_and_writes(backend):
+    import server
+
+    ctx = _FakeCtx(backend)
+    write = await server.drawing_settings(settings={"units": "mm", "dimscale": 1.0}, ctx=ctx)
+    assert write["ok"] is True
+    read = await server.drawing_settings(ctx=ctx)
+    assert read["settings"]["units"]["name"] == "mm"