@applicaster/zapp-react-dom-app/Polyfills/Storage/__tests__/StorageMocks.js

Zapp App Component for Applicaster's Quick Brick React Native App

import * as R from "ramda";

export function StorageMock() {
  const storage = {};

  const methods = ["setItem", "getItem", "removeItem", "clear"];

  storage.setItem = (key, value) => {
    if (R.includes("fail", key)) {
      throw new Error(`Could not set item ${key}`);
    }

    this[key] = value;
  };

  storage.clear = () => {
    R.forEach((key) => {
      delete this[key];
    }, R.keys(this));
  };

  storage.removeItem = (key) => {
    if (R.includes("fail", key)) {
      throw new Error(`Could not remove item ${key}`);
    }

    delete this[key];

    return true;
  };

  storage.getItem = (key) => {
    const result = this[key];

    if (!result) {
      throw new Error(`Could not retrieve item ${key}`);
    }

    return result;
  };

  Object.defineProperty(storage, "length", {
    get: () =>
      R.compose(R.length, R.reject(R.includes(R.__, methods)), R.keys)(this),
  });

  Object.defineProperty(storage, "keys", {
    get: () => R.compose(R.reject(R.includes(R.__, methods)), R.keys)(this),
  });

  return storage;
}