fix: final refactoring pass

tests/renderer/utils/tabPersistence.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import type { TabState } from '../../../src/renderer/store';
+import { loadTabsForProject, saveTabsForProject } from '../../../src/renderer/utils/tabPersistence';
+
+const projectId = 'project-1';
+
+const sampleTabState: TabState = {
+  tabs: [
+    {
+      id: 'post-1',
+      type: 'post',
+      title: 'Hello World',
+      dirty: false,
+    },
+  ],
+  activeTabId: 'post-1',
+};
+
+describe('tabPersistence', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    vi.restoreAllMocks();
+  });
+
+  it('saves and loads tab state for a project', () => {
+    saveTabsForProject(projectId, sampleTabState);
+
+    const loaded = loadTabsForProject(projectId);
+
+    expect(loaded).toEqual(sampleTabState);
+  });
+
+  it('returns null when no tab state is stored', () => {
+    expect(loadTabsForProject(projectId)).toBeNull();
+  });
+
+  it('returns null when stored tab state is invalid JSON', () => {
+    localStorage.setItem('bds-tabs-project-1', '{invalid-json');
+
+    expect(loadTabsForProject(projectId)).toBeNull();
+  });
+
+  it('does not throw when localStorage.setItem fails', () => {
+    vi.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
+      throw new Error('quota exceeded');
+    });
+
+    expect(() => saveTabsForProject(projectId, sampleTabState)).not.toThrow();
+  });
+});