frontend-project/userSlice.test.ts

import userReducer, { setCurrentUser, addUser, removeUser, setLoading, setError } from './userSlice';
import { User } from './userSlice';

describe('userSlice', () => {
  const mockUser: User = {
    id: '1',
    name: 'John Doe',
    email: 'john@example.com',
  };

  it('should return the initial state', () => {
    expect(userReducer(undefined, { type: 'unknown' })).toEqual({
      currentUser: null,
      users: [],
      loading: false,
      error: null,
    });
  });

  it('should handle setCurrentUser', () => {
    const actual = userReducer(undefined, setCurrentUser(mockUser));
    expect(actual.currentUser).toEqual(mockUser);
  });

  it('should handle addUser', () => {
    const actual = userReducer(undefined, addUser(mockUser));
    expect(actual.users).toContainEqual(mockUser);
  });

  it('should handle removeUser', () => {
    const state = {
      currentUser: null,
      users: [mockUser],
      loading: false,
      error: null,
    };
    const actual = userReducer(state, removeUser('1'));
    expect(actual.users).not.toContainEqual(mockUser);
  });

  it('should handle setLoading', () => {
    const actual = userReducer(undefined, setLoading(true));
    expect(actual.loading).toBe(true);
  });

  it('should handle setError', () => {
    const errorMessage = 'An error occurred';
    const actual = userReducer(undefined, setError(errorMessage));
    expect(actual.error).toBe(errorMessage);
  });
});