From b9eb69fc81f6d97e417c08bca31b0229bbe865eb Mon Sep 17 00:00:00 2001
From: Agent Zero <agent@media-on.de>
Date: Wed, 26 Aug 2026 12:53:07 +0200
Subject: [PATCH] task(B0): regression tests for known bugs (red)

---
 frontend/tests/bugs.regress.test.ts | 71 +++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 frontend/tests/bugs.regress.test.ts

diff --git a/frontend/tests/bugs.regress.test.ts b/frontend/tests/bugs.regress.test.ts
new file mode 100644
index 0000000..d42efaf
--- /dev/null
+++ b/frontend/tests/bugs.regress.test.ts
@@ -0,0 +1,71 @@
+/**
+ * Regressions-Tests für bekannte Bugs BUG-1, BUG-1b, BUG-2.
+ * Diese Tests sind VOR dem jeweiligen Fix ROT (dokumentiertes Fehlverhalten)
+ * und müssen danach GRÜN sein.
+ */
+import { describe, it, expect } from 'vitest';
+import { SeatingService } from '../src/services/seatingService';
+import { trimElement } from '../src/tools/modification/geometry';
+import type { CADElement } from '../src/types/cad.types';
+
+// ── Helfer (Muster aus tests/geometry.test.ts) ─────────────
+function makeLine(id: string, x1: number, y1: number, x2: number, y2: number): CADElement {
+  return {
+    id,
+    type: 'line',
+    layerId: 'layer-1',
+    x: (x1 + x2) / 2,
+    y: (y1 + y2) / 2,
+    width: Math.abs(x2 - x1),
+    height: Math.abs(y2 - y1),
+    properties: { x1, y1, x2, y2 },
+  } as unknown as CADElement;
+}
+
+function makeCircle(id: string, cx: number, cy: number, r: number): CADElement {
+  return {
+    id,
+    type: 'circle',
+    layerId: 'layer-1',
+    x: cx,
+    y: cy,
+    width: r * 2,
+    height: r * 2,
+    properties: { radius: r },
+  } as unknown as CADElement;
+}
+
+// ── BUG-1: rowId-Kollision bei schnellem Erzeugen ───────────
+describe('BUG-1: seating row ids', () => {
+  it('zwei direkt hintereinander erzeugte Reihen haben unterschiedliche rowIds', () => {
+    const svc = new SeatingService();
+    const a = svc.createSeatingRow(0, 0, 'layer-1');
+    const b = svc.createSeatingRow(0, 100, 'layer-1');
+    const ids = new Set([a[0].properties.rowId, b[0].properties.rowId]);
+    expect(ids.size).toBe(2);
+  });
+});
+
+// ── BUG-1b: Block-Reihen ohne eigene rowId ──────────────────
+describe('BUG-1b: seating block row ids', () => {
+  it('jede Reihe eines Blocks hat eine eigene, definierte rowId', () => {
+    const svc = new SeatingService();
+    const els = svc.createSeatingBlock(0, 0, 'layer-1', { rows: 3, cols: 2 });
+    expect(els.length).toBe(6);
+    const rowIds = new Set(els.map((e) => e.properties.rowId));
+    expect(rowIds.size).toBe(3);
+    for (const rid of rowIds) expect(rid).toBeDefined();
+  });
+});
+
+// ── BUG-2: Trim an Kreis scheitert (findIntersection nur Gerade×Gerade) ──
+describe('BUG-2: trim line at circle', () => {
+  it('trimElement(Linie, Kreis) liefert ein Ergebnis statt null', () => {
+    // Linie von (0,0) nach (200,0) schneidet Kreis (Zentrum 100,0, Radius 40)
+    // an x=60 und x=140 → Schnitt existiert eindeutig.
+    const line = makeLine('l1', 0, 0, 200, 0);
+    const circle = makeCircle('c1', 100, 0, 40);
+    const result = trimElement(line, circle);
+    expect(result).not.toBeNull();
+  });
+});