storage/src/index.test.ts

import { getLocalStorage } from ".";
import { MemoryStorage, ScopedStorage } from "./basic";
import { BrowserLocalStorage } from "./browser";
import { NodeDirectoryStorage } from "./node";
import { forceNodeStoragesInTempDir } from "./node.test";

const localStorage = (window as any).localStorage;

describe(getLocalStorage, () => {
  forceNodeStoragesInTempDir();

  afterEach(() => {
    (window as any).localStorage = localStorage;
  });

  it("returns the best storage available", async () => {
    const mockWarn = jest.spyOn(console, "warn").mockImplementation();

    let storage = getLocalStorage("app1");
    expect(storage).toBeInstanceOf(ScopedStorage);
    expect((storage as any).target).toBeInstanceOf(BrowserLocalStorage);
    expect(mockWarn).not.toHaveBeenCalled();

    await storage.set("testkey", "testvalue");
    expect(await storage.get("testkey")).toBe("testvalue");

    storage = getLocalStorage("app1");
    expect(await storage.get("testkey")).toBe("testvalue");

    storage = getLocalStorage("app2");
    expect(await storage.get("testkey")).toBeNull();

    delete (window as any)["localStorage"];
    storage = getLocalStorage("app1");
    expect(storage).toBeInstanceOf(NodeDirectoryStorage);

    (NodeDirectoryStorage.findUserData as any).mockImplementation(() => { throw new Error() });

    storage = getLocalStorage("app1");
    expect(storage).toBeInstanceOf(MemoryStorage);
    expect(mockWarn).toHaveBeenCalledWith("No persistent storage available, using in-memory volatile storage");
  });
});