[juw12]

Closes #1637.

Sketch.bezier used to call self._endPoint() before building the curve, so it raised when the sketch had no edges yet. That call has since been removed (the curve is built only from the given points), but the issue is still open and nothing tests the case, so a regression could come back unnoticed.

This adds test_bezier_without_prior_edge, which checks that:

• a closed profile made only of two cubic beziers, with no preceding segment, assembles into one face;
• its area matches the analytic value: each half encloses (\int_0^1 y,x',dt = 36\int_0^1 t^2(1-t)^2,dt = 1.2), so the total is 2.4;
• a single standalone bezier creates one edge whose end points are the first and last control points.

Test only, no library changes. pytest tests/test_sketch.py passes locally (37 passed) on current master with cadquery-ocp 8.0.1.1.0, Python 3.13, Windows.

I used an AI assistant to help find the issue and draft the test; I checked the math and ran the suite myself.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.81%. Comparing base (8178185) to head (fefa822).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2123   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files          30       30           
  Lines        9605     9605           
  Branches     1443     1443           
=======================================
  Hits         9203     9203           
  Misses        247      247           
  Partials      155      155           

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