leumas-universal-preset/tests/│ └── getWeather.test.js

A microservice to declare universal functions packed with reusable props via preset mappings.

const { expect } = require('chai');
const { withPreset, mappings } = require('../index');

// Define a simple getWeather function that uses positional parameters.
// It returns a dummy temperature based on the unit.
const getWeather = (city, unit = 'Celsius') => {
    console.log("City from preset : ", city)
  const temperature = unit === 'Fahrenheit' ? '72°F' : '22°C';
  return { city, temperature };
};

describe('getWeather withPreset Tests', () => {
  // Retrieve the default mapping for getWeather.
  const getWeatherMapping = mappings.getWeather.default; // { city: 0, unit: 1 }

  it('should return weather for London using preset', () => {
    const londonPreset = { city: 'London', unit: 'Celsius' };
    const getWeatherLondon = withPreset(getWeather, londonPreset, { mapping: getWeatherMapping });
    const result = getWeatherLondon();
    expect(result).to.deep.equal({ city: 'London', temperature: '22°C' });
  });

  it('should return weather for New York using preset', () => {
    const newYorkPreset = { city: 'New York', unit: 'Fahrenheit' };
    const getWeatherNY = withPreset(getWeather, newYorkPreset, { mapping: getWeatherMapping });
    const result = getWeatherNY();
    expect(result).to.deep.equal({ city: 'New York', temperature: '72°F' });
  });

  it('should allow override of preset city', () => {
    const tokyoPreset = { city: 'Tokyo', unit: 'Celsius' };
    const getWeatherTokyo = withPreset(getWeather, tokyoPreset, { mapping: getWeatherMapping });
    // Override the preset city by providing a different value.
    const result = getWeatherTokyo('Osaka');
    expect(result).to.deep.equal({ city: 'Osaka', temperature: '22°C' });
  });

  it('should allow override of preset unit', () => {
    const parisPreset = { city: 'Paris', unit: 'Celsius' };
    const getWeatherParis = withPreset(getWeather, parisPreset, { mapping: getWeatherMapping });
    // Override the unit argument to Fahrenheit.
    const result = getWeatherParis(undefined, 'Fahrenheit');
    expect(result).to.deep.equal({ city: 'Paris', temperature: '72°F' });
  });
});