feat: Absturzschutz fuer die laufende Sitzung

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

test/storage.test.js

@@ -0,0 +1,54 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { saveSession, loadSession, clearSession } from '../src/storage.js';
+import { createSession, commitAssignment } from '../src/session.js';
+import { emptySpec } from '../src/spec.js';
+
+function fakeStore() {
+  const data = new Map();
+  return {
+    data,
+    getItem: (key) => (data.has(key) ? data.get(key) : null),
+    setItem: (key, value) => data.set(key, value),
+    removeItem: (key) => data.delete(key),
+  };
+}
+
+test('leerer Speicher liefert null', () => {
+  assert.equal(loadSession(fakeStore()), null);
+});
+
+test('Sitzung ueberlebt Sichern und Laden', () => {
+  const store = fakeStore();
+  const session = createSession();
+  commitAssignment(session, { ...emptySpec(), capacityGb: 64 }, 'barcode', 'A');
+  saveSession(session, store);
+
+  const wieder = loadSession(store);
+  assert.equal(wieder.stacks.length, 1);
+  assert.equal(wieder.stacks[0].count, 1);
+  assert.equal(wieder.entries[0].spec.capacityGb, 64);
+  assert.equal(wieder.nextEntryId, 2);
+});
+
+test('clearSession raeumt auf', () => {
+  const store = fakeStore();
+  saveSession(createSession(), store);
+  clearSession(store);
+  assert.equal(loadSession(store), null);
+});
+
+test('kaputter Inhalt liefert null statt einer Ausnahme', () => {
+  const store = fakeStore();
+  store.setItem('ram-sortierhilfe:session', '{kein json');
+  assert.equal(loadSession(store), null);
+});
+
+test('Sichern ohne funktionierenden Speicher wirft nicht', () => {
+  const kaputt = {
+    getItem: () => null,
+    setItem: () => { throw new Error('quota exceeded'); },
+    removeItem: () => {},
+  };
+  assert.doesNotThrow(() => saveSession(createSession(), kaputt));
+});