UnitTestsChallenge.js

// not clean

// function addProduct(name, price) {
//   if (!name || name.trim() === '' || !price || price < 0) {
//     console.log('Invalid input - product was not created.');
//     return;
//   }
//   const product = {
//     id: name + '_' + Math.random().toString(),
//     name: name,
//     price: price,
//   };
//   database.insert('products', product);
//   return product;
// }
//
// describe(function () {
//   it('should create a product for valid names and prices', function () {
//     const createdProduct = addProduct('Carpet', 19);
//     expect(createdProduct).not.toBeUndefined();
//   });
//
//   it('should generate a product id that contains the product name', function () {
//     const createdProduct = addProduct('Book', 19);
//     expect(createdProduct.id).stringContaining('Book');
//   });
// });


// clean


function addProduct(name, price) {
  validateProductData(name, price);

  const savedProduct = saveProduct(name, price);
  return savedProduct;
}

function validateProductData(name, price) {
  if (!inputIsValid(name, price)) {
    throw new Error('Invalid input - product was not created.');
  }
}

function inputIsValid(name, price) {
  return !isEmpty(name) && hasMinValue(price, 0);
}

function isEmpty(value) {
  return !value || value.trim() === '';
}

describe(function () {
  it('return true if an empty name is passed as a value', function () {
    const validationResult = isEmpty('');
    expect(validationResult).toEqual(true);
  });

  it('return false if a non-empty name is passed as a value', function () {
    const validationResult = isEmpty('Test');
    expect(validationResult).toEqual(false);
  });
});

function hasMinValue(value, minValue) {
  return value > minValue;
}

describe(function () {
  it('return true if a value above the minValue is provided', function () {
    const validationResult = hasMinValue(10, 8);
    expect(validationResult).toEqual(true);
  });

  it('return false if a value below the minValue is provided', function () {
    const validationResult = hasMinValue(5, 8);
    expect(validationResult).toEqual(false);
  });
});


function showErrorMessage(message) {
  console.log(message);
}

function saveProduct(name, price) {
  const product = {
    id: generateRandomId(name),
    name: name,
    price: price,
  };
  database.insert('products', product);
  return product;
}

function generateRandomId(baseValue) {
  return baseValue + '_' + Math.random().toString();
}