feat: add local storage service

src/app/services/localstorage.spec.ts

@@ -0,0 +1,61 @@
+import { TestBed } from '@angular/core/testing';
+
+import { Localstorage } from './localstorage';
+
+describe('Localstorage', () => {
+  let service: Localstorage;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(Localstorage);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+
+  it('should set item to localStorage', () => {
+    const ITEM_MOCK = { mock: 'mock' };
+    const ITEM_KEY_MOCK = 'mock';
+    const setItemSpy = spyOn(globalThis.localStorage, 'setItem');
+    service.setItem(ITEM_KEY_MOCK, ITEM_MOCK);
+    expect(setItemSpy).toHaveBeenCalledOnceWith(ITEM_KEY_MOCK, JSON.stringify(ITEM_MOCK));
+  });
+
+  it('should handle json stringify error on setItem', () => {
+    const ITEM_MOCK = { mock: BigInt(1) };
+    const ITEM_KEY_MOCK = 'mock';
+    const setItemSpy = spyOn(globalThis.localStorage, 'setItem');
+    service.setItem(ITEM_KEY_MOCK, ITEM_MOCK);
+    expect(setItemSpy).not.toHaveBeenCalled();
+  });
+
+  it('should get null from localStorage if it is malformed JSON string ', () => {
+    const ITEM_MOCK = '{"mock":"mock}';
+    const ITEM_KEY_MOCK = 'mock';
+    spyOn(globalThis.localStorage, 'getItem').and.returnValue(ITEM_MOCK);
+    const item = service.getItem(ITEM_KEY_MOCK);
+    expect(item).toBeNull();
+  });
+
+  it('should get item from localStorage', () => {
+    const ITEM_MOCK = '{"mock":"mock"}';
+    const ITEM_KEY_MOCK = 'mock';
+    const getItemSpy = spyOn(globalThis.localStorage, 'getItem').and.returnValue(ITEM_MOCK);
+    service.getItem(ITEM_KEY_MOCK);
+    expect(getItemSpy).toHaveBeenCalledOnceWith(ITEM_KEY_MOCK);
+  });
+
+  it('should remove item from localStorage', () => {
+    const ITEM_KEY_MOCK = 'mock';
+    const removeSpy = spyOn(globalThis.localStorage, 'removeItem');
+    service.removeItem(ITEM_KEY_MOCK);
+    expect(removeSpy).toHaveBeenCalledOnceWith(ITEM_KEY_MOCK);
+  });
+
+  it('should clear localStorage', () => {
+    const clearSpy = spyOn(globalThis.localStorage, 'clear');
+    service.clear();
+    expect(clearSpy).toHaveBeenCalledTimes(1);
+  });
+});

src/app/services/localstorage.ts

@@ -0,0 +1,34 @@
+import { Injectable } from '@angular/core';
+import { environment } from '../../environments/environment';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class Localstorage {
+  setItem(key: string, value: any): void {
+    try {
+      const jsonValue = JSON.stringify(value);
+      localStorage.setItem(key, jsonValue);
+    } catch (error) {
+      if (!environment.prod) console.error('Error saving to local storage', error);
+    }
+  }
+
+  getItem<T>(key: string): T | null {
+    try {
+      const value = localStorage.getItem(key);
+      return value ? JSON.parse(value) : null;
+    } catch (error) {
+      if (!environment.prod) console.error('Error reading from local storage', error);
+      return null;
+    }
+  }
+
+  removeItem(key: string): void {
+    localStorage.removeItem(key);
+  }
+
+  clear(): void {
+    localStorage.clear();
+  }
+}