import { merge } from './merge';

describe('merge', () => {
  test('should merge two objects', () => {
    const obj1 = {
      name: 'John'
    };
    const obj2 = {
      age: 20
    };
    const newObj = merge(obj1, obj2);
    expect(newObj).toEqual({
      name: 'John',
      age: 20
    });
  });

  test('should overwrite properties in the first object', () => {
    const obj1 = {
      name: 'John',
      age: 20
    };
    const obj2 = {
      age: 25
    };
    const newObj = merge(obj1, obj2);
    expect(newObj).toEqual({
      name: 'John',
      age: 25
    });
  });

  test('should merge recursively', () => {
    const styles1 = {
      backgroundColor: 'red',
      ':hover': {
        backgroundColor: 'blue'
      }
    };
    const styles2 = {
      backgroundColor: 'blue',
      color: 'green',
      ':hover': {
        color: 'yellow'
      }
    };
    const styles = merge(styles1, styles2);
    expect(styles).toEqual({
      backgroundColor: 'blue',
      color: 'green',
      ':hover': {
        backgroundColor: 'blue',
        color: 'yellow'
      }
    });
  });
});