test(stammbaum): assert no node sits between AC2 spouses on same y (#361)
Cycle-2 follow-up from Sara. The existing assertion `Math.abs(posA2.x - posB2.x) === NODE_W + COL_GAP` proves adjacency in the current integer-slot packer but would silently pass if a future refactor moved to fractional offsets with a third node squatting at a non-slot x between the spouses. The added loop closes that contract. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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@@ -266,6 +266,19 @@ describe('buildLayout — multi-spouse ordering (#361)', () => {
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const posB2 = layout.positions.get(B2)!;
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expect(posA2.y).toBe(posB2.y);
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expect(Math.abs(posA2.x - posB2.x)).toBe(NODE_W + COL_GAP);
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// Tighter contract (Sara's cycle-2 follow-up): no third node may sit
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// at an x strictly between the two spouses on the same y. The integer-
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// slot adjacency check above (==NODE_W+COL_GAP) is correct today but
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// would silently pass if a future layout change introduced fractional
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// offsets and placed a node at a non-slot x between the spouses.
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const minX = Math.min(posA2.x, posB2.x);
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const maxX = Math.max(posA2.x, posB2.x);
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for (const [id, p] of layout.positions) {
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if (id === A2 || id === B2) continue;
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if (p.y !== posA2.y) continue;
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expect(p.x <= minX || p.x >= maxX).toBe(true);
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}
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});
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it('canonical_fixture_multi_spouse_falls_through_to_displayName_when_no_fromYear', () => {
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