houserules/packages/chess/e2e/full-flow.spec.js

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JavaScript

import { test, expect } from '@playwright/test';
/**
* Full Phase-3 gate scenario:
* preset-toggle → Scholar's Mate play → undo → save/reload → export → import → checkmate
*
* Undo is exercised on the *original* page before reload, where moveHistoryRef
* still holds all moves since start (loadEngine resets history, so undo is only
* meaningful there). Export/import is verified by restoring that same 8-move
* position in a fresh browser context, then completing the Scholar's Mate.
*/
test("full game flow: preset toggle, Scholar's Mate, save/reload, export/import, undo, checkmate", async ({ page, browser }) => {
// ── Step 1: Preset toggles ─────────────────────────────────────────────────
await page.goto('/rules');
// pawns-move-backward: incompatibleWith ["double-pawn-sprint"] only
await page.locator('[data-preset="pawns-move-backward"] [data-role="toggle"]').click();
// knights-leap-twice: incompatibleWith []
await page.locator('[data-preset="knights-leap-twice"] [data-role="toggle"]').click();
// These two presets are compatible — no compat warning
await expect(page.locator('[data-testid="compat-warning"]')).not.toBeVisible();
await page.locator('[data-action="start-new-game"]').click();
await page.waitForURL('**/game');
// ── Step 2: Play all 8 moves before any reload ────────────────────────────
//
// We play ALL 8 moves here on the pristine page so that moveHistoryRef still
// holds the full sequence. loadEngine() resets moveHistoryRef to [], so any
// subsequent reload/import invalidates the undo chain; doing undo NOW (before
// the first reload) is the only way to test it correctly without source changes.
//
// Targeting `[data-square="${from}"] [data-piece]` places the drag origin on
// the draggable piece element so that dragstart fires on it. The target is the
// square div that has onDrop/onDragOver.
const drag = async (from, to) => {
await page
.locator(`[data-square="${from}"] [data-piece]`)
.dragTo(page.locator(`[data-square="${to}"]`));
};
// Scholar's Mate setup — moves 1-5
await drag('e2', 'e4'); // 1. e4
await drag('e7', 'e5'); // 1...e5
await drag('f1', 'c4'); // 2. Bc4
await drag('b8', 'c6'); // 2...Nc6
await drag('d1', 'h5'); // 3. Qh5
await expect(page.locator('[data-testid="turn-indicator"]')).toContainText('Black');
// Continuation — moves 6-8
await drag('d7', 'd6'); // 3...d6 (random; Qf7 still covers d7 via rank-7)
await drag('a2', 'a3'); // 4. a3 (random)
await drag('g8', 'f6'); // 4...Nf6?? — will be undone
// ── Step 3: Undo Nf6, verify knight back on g8 ────────────────────────────
// History = [e4,e5,Bc4,Nc6,Qh5,d6,a3,Nf6] → pop → [e4,e5,Bc4,Nc6,Qh5,d6,a3]
// Rebuild replays all 7 moves from initial; g8 kingside knight is untouched
// (only the b8 queenside knight moved to c6 in move 4).
await page.locator('[data-action="undo"]').click();
await expect(page.locator('[data-square="g8"] [data-piece="black-knight"]')).toBeVisible();
// Re-play Nf6 to restore the 8-move export state (White's turn)
await drag('g8', 'f6'); // 4...Nf6?? again
// ── Step 4: Save named slot ────────────────────────────────────────────────
await page.goto('/save');
await page.fill('input[type="text"]', 'scholars-test');
await page.locator('[data-action="save"]').click();
await expect(page.locator('[data-testid="save-slot-scholars-test"]')).toBeVisible();
// ── Step 5: Reload → autosave restore ─────────────────────────────────────
// Each applyMove() calls saveAutoSave(); App.useEffect restores it on mount.
// The last applyMove was Nf6 → autosave = 8-move state.
// Queen on h5 and bishop on c4 are present in that state (neither moved
// during moves 6-8).
await page.reload();
await page.goto('/game');
await expect(page.locator('[data-square="h5"] [data-piece="white-queen"]')).toBeVisible();
await expect(page.locator('[data-square="c4"] [data-piece="white-bishop"]')).toBeVisible();
// ── Step 6: Export JSON (8-move state, White's turn) ──────────────────────
await page.goto('/save');
const downloadPromise = page.waitForEvent('download');
await page.locator('[data-action="export"]').click();
const download = await downloadPromise;
const exportPath = `/tmp/chess-export-${Date.now()}.json`;
await download.saveAs(exportPath);
// ── Step 7: Import in a fresh browser context ──────────────────────────────
const freshContext = await browser.newContext();
const freshPage = await freshContext.newPage();
await freshPage.goto('http://localhost:5173/save');
// setInputFiles works on hidden inputs; onChange → FileReader → onLoad(facts)
// → handleLoad in SaveWrapper → loadEngine → saveAutoSave → navigate('/game')
const fileInput = freshPage.locator('input[type="file"]');
await fileInput.setInputFiles(exportPath);
await freshPage.waitForURL('**/game');
// Verify the 8-move position was restored in the fresh context
await expect(freshPage.locator('[data-square="h5"] [data-piece="white-queen"]')).toBeVisible();
await expect(freshPage.locator('[data-square="c4"] [data-piece="white-bishop"]')).toBeVisible();
// ── Step 8: Scholar's Mate — Qxf7# ───────────────────────────────────────
// It is White's turn (after Black's Nf6 in the imported 8-move state).
// h5→f7 is a 2-square diagonal via empty g6. f7 has the black f7 pawn.
// Queen on f7 is defended by Bc4 (c4-d5-e6-f7 diagonal).
// Black king on e8 cannot escape:
// d8 = own queen (occupied), d7 = attacked by Qf7 along rank-7,
// e7 = attacked by Qf7 (adjacent on rank-7), f8 = own bishop (occupied),
// f7 = queen (defended by Bc4).
// Nf6 cannot capture f7 (not an L-shaped jump from f6).
await freshPage
.locator('[data-square="h5"] [data-piece]')
.dragTo(freshPage.locator('[data-square="f7"]'));
// ── Step 9: Assert checkmate ──────────────────────────────────────────────
await expect(freshPage.locator('[data-testid="game-over"]')).toBeVisible();
await freshContext.close();
});
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