feat: First iteration, multi themes, I18N

tests/saveio.test.js

@@ -0,0 +1,54 @@
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import { createState } from '../public/js/engine/state.js';
+import { buildExport, ImportError, parseImport } from '../public/js/services/saveio.js';
+import { decode, encode } from '../public/js/services/storage.js';
+import { loadContext } from './helpers.js';
+
+const ctx = loadContext();
+const themes = ['paperclip', 'witch'];
+
+test('export then import restores the save and its theme', () => {
+  const state = createState(ctx);
+  state.funds = 42;
+  state.generators.gen1 = 7;
+  const text = buildExport('witch', state);
+  const imported = parseImport(text, ctx, themes);
+  assert.equal(imported.themeId, 'witch');
+  assert.equal(imported.state.funds, 42);
+  assert.equal(imported.state.generators.gen1, 7);
+});
+
+test('import also accepts text with a BOM and surrounding whitespace (.txt files)', () => {
+  const text = `  \n${buildExport('paperclip', createState(ctx))}\n\n`;
+  assert.equal(parseImport(text, ctx, themes).themeId, 'paperclip');
+});
+
+const failure = (text) => {
+  try {
+    parseImport(text, ctx, themes);
+  } catch (error) {
+    assert.ok(error instanceof ImportError);
+    return error.code;
+  }
+  assert.fail('should have thrown');
+};
+
+test('import rejects bad input with a specific code', () => {
+  assert.equal(failure(''), 'empty');
+  assert.equal(failure('not json'), 'invalid');
+  assert.equal(failure('{"hello":1}'), 'wrong_game');
+  const unknown = JSON.parse(buildExport('paperclip', createState(ctx)));
+  unknown.theme = 'dragons';
+  assert.equal(failure(JSON.stringify(unknown)), 'unknown_theme');
+  const broken = JSON.parse(buildExport('paperclip', createState(ctx)));
+  broken.state = 'x';
+  assert.equal(failure(JSON.stringify(broken)), 'invalid');
+});
+
+test('cookie encoding is cookie-safe and lossless', () => {
+  const text = JSON.stringify({ accents: 'éàü — ✓', long: 'x'.repeat(5000) });
+  const encoded = encode(text);
+  assert.match(encoded, /^[A-Za-z0-9_-]*$/);
+  assert.equal(decode(encoded), text);
+});