Initial crossword addition and arcade redesign

src/lib/arcade/crosswordEngine.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { generateCrosswordLayout } from "@/lib/arcade/crosswordEngine";
+import { crosswordTestPack } from "@/lib/arcade/crosswordTestData";
+
+describe("Crossword grid engine", () => {
+  it("is deterministic and respects the selected target", () => {
+    const pack = crosswordTestPack();
+    const first = generateCrosswordLayout(pack, "mini", "same-seed");
+    const second = generateCrosswordLayout(pack, "mini", "same-seed");
+    expect(second).toEqual(first);
+    expect(first.entries).toHaveLength(15);
+    expect(first.entries.length).toBeLessThanOrEqual(first.targetCount);
+    expect(first.entries.length + first.omittedEntries.length).toBe(80);
+  });
+
+  it("creates matching cells, shared intersections, and sequential clue numbers", () => {
+    const layout = generateCrosswordLayout(crosswordTestPack(), "standard", "grid-rules");
+    const cellByKey = new Map(layout.cells.map((cell) => [cell.key, cell]));
+    expect(layout.entries.length).toBeGreaterThanOrEqual(15);
+    expect(layout.cells.some((cell) => cell.entryIds.length > 1)).toBe(true);
+    for (const entry of layout.entries) {
+      expect(entry.cellKeys.map((key, index) => cellByKey.get(key)?.answer === entry.answer[index]).every(Boolean)).toBe(true);
+      expect(entry.number).toBeGreaterThan(0);
+    }
+  });
+});