🤖 Example 2 for 'What is Testing?'

what_is_testing_example_2.js

// what_is_testing

/**
 * Calculates the number of the specified pokemon caught given a map representing the current Pokedex state.
 *
 * @param {{pokemon: string, count: number}} pokedexState the sample Pokedex state
 * @param {string} pokemonToCount the list of Pokemon to include in the total count
 * @returns {number} the total specified Pokemon caught
 */
let calculateTotalSpecifiedPokemonCaught = ( pokedexState, ...pokemonToCount ) => {
	let totalPokemonCaught = 0

	for ( let index = 0; index < pokemonToCount.length; index++ ) {
		let currentPokemon = pokemonToCount[ index ]

		totalPokemonCaught += pokedexState[ currentPokemon ]
	}

	return totalPokemonCaught
}

/**
 * @param {string} testID a description to match this result to the executed function
 * @param expected expected result of the test function
 * @param actual actual result of the test function
 */
let checkResults = (testID, expected, actual) => {
	if ( expected === actual ) {
		console.log(`SUCCESS test '${testID}'`)
	}
	else {
		// using ES6 template literals to format output string with expected data
		console.log( `FAILED test '${testID}' -- expected ${expected} but got ${actual}` )
	}
}

//// sample test data

let samplePokedexState = {
	'Pikachu': 4,
	'JigglyPuff': 2,
	'MewTwo': 1,
	'Bulbasaur': 1
}

let sampleEmptyPokedexState = {}

//// test calls

let result;

// empty data parameters

result = calculateTotalSpecifiedPokemonCaught( sampleEmptyPokedexState )

checkResults( 'empty data', 0, result )

// non-empty Pokedex, looking for Pokemon that exist within the map

result = calculateTotalSpecifiedPokemonCaught( samplePokedexState, 'Pikachu', 'Bulbasaur' )

checkResults( 'existing Pokemon', 5, result )

// non-empty Pokedex, looking for Pokemon that don't exist within the map

result = calculateTotalSpecifiedPokemonCaught( samplePokedexState, 'Vulpix' )

checkResults( 'missing Pokemon', 0, result )

// non-empty Pokedex, looking for some Pokemon that don't exist within the map, and some that do

result = calculateTotalSpecifiedPokemonCaught( samplePokedexState, 'Vulpix', 'Pikachu' )

checkResults( 'existing and missing Pokemon', 4, result )

// SUCCESS test 'empty data'
// SUCCESS test 'existing Pokemon'
// FAILED test 'missing Pokemon' -- expected 0 but got NaN
// FAILED test 'existing and missing Pokemon' -- expected 4 but got NaN