test: coverage on atomWithSyncStorage (#1779)

packages/jotai/src/__tests__/index.spec.ts

@@ -0,0 +1,36 @@
+/**
+ * @vitest-environment happy-dom
+ */
+import { atomWithSyncStorage } from '@affine/jotai';
+import { createStore } from 'jotai';
+import { afterEach, describe, expect, test } from 'vitest';
+
+afterEach(() => {
+  localStorage.clear();
+});
+
+describe('atomWithSyncStorage', () => {
+  test('basic', () => {
+    const store = createStore();
+    {
+      [0, '0', false, null, undefined, NaN].forEach(value => {
+        const atom = atomWithSyncStorage('test', value);
+        expect(store.get(atom)).toBe(value);
+      });
+    }
+  });
+  test('mutate', () => {
+    {
+      const store = createStore();
+      const atom = atomWithSyncStorage('test', 0);
+      expect(store.get(atom)).toBe(0);
+      store.set(atom, 1);
+      expect(store.get(atom)).toBe(1);
+    }
+    {
+      const store = createStore();
+      const atom = atomWithSyncStorage('test', 0);
+      expect(store.get(atom)).toBe(1);
+    }
+  });
+});