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index.unit.test.js
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index.unit.test.js
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/* eslint-disable no-extend-native, global-require */
const ranked = require('./index');
const scoreFn = language => language.year;
const languages = [
{ name: 'LISP', year: 1958 },
{ name: 'COBOL', year: 1959 },
{ name: 'C', year: 1972 },
{ name: 'SmallTalk', year: 1972 },
{ name: 'C++', year: 1980 },
{ name: 'Eiffel', year: 1985 },
{ name: 'Objective-C', year: 1986 },
{ name: 'ERLang', year: 1986 },
{ name: 'Haskell', year: 1990 },
{ name: 'Python', year: 1991 },
{ name: 'Ruby', year: 1993 },
{ name: 'R', year: 1993 },
{ name: 'Lua', year: 1993 },
{ name: 'PHP', year: 1995 },
{ name: 'Javascript', year: 1995 },
{ name: 'Java', year: 1995 },
{ name: 'Delphi', year: 1995 },
{ name: 'C#', year: 2001 },
{ name: 'Groovy', year: 2003 },
{ name: 'Scala', year: 2003 },
{ name: 'Go', year: 2009 },
];
/**
* Verifies that the rank and year are both correct
*
* @param {object} result the ranked object
* @param {number} rank expected on result
* @param {number} year expected on result
* @throws {AssertionError}
* @returns {undefined}
*/
function verify(result, rank, year) {
expect(result.rank).toBe(rank);
expect(result.item.year).toBe(year);
}
describe('ranking', () => {
test('competition ranking', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'competition',
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 2, 2003);
verify(res[2], 2, 2003);
verify(res[3], 4, 2001);
verify(res[4], 5, 1995);
verify(res[5], 5, 1995);
verify(res[6], 5, 1995);
verify(res[7], 5, 1995);
verify(res[8], 9, 1993);
verify(res[9], 9, 1993);
verify(res[10], 9, 1993);
verify(res[11], 12, 1991);
verify(res[12], 13, 1990);
verify(res[13], 14, 1986);
verify(res[14], 14, 1986);
verify(res[15], 16, 1985);
verify(res[16], 17, 1980);
verify(res[17], 18, 1972);
verify(res[18], 18, 1972);
verify(res[19], 20, 1959);
verify(res[20], 21, 1958);
});
test('dense ranking', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'dense',
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 2, 2003);
verify(res[2], 2, 2003);
verify(res[3], 3, 2001);
verify(res[4], 4, 1995);
verify(res[5], 4, 1995);
verify(res[6], 4, 1995);
verify(res[7], 4, 1995);
verify(res[8], 5, 1993);
verify(res[9], 5, 1993);
verify(res[10], 5, 1993);
verify(res[11], 6, 1991);
verify(res[12], 7, 1990);
verify(res[13], 8, 1986);
verify(res[14], 8, 1986);
verify(res[15], 9, 1985);
verify(res[16], 10, 1980);
verify(res[17], 11, 1972);
verify(res[18], 11, 1972);
verify(res[19], 12, 1959);
verify(res[20], 13, 1958);
});
test('modified competition ranking', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'modified-competition',
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 3, 2003);
verify(res[2], 3, 2003);
verify(res[3], 4, 2001);
verify(res[4], 8, 1995);
verify(res[5], 8, 1995);
verify(res[6], 8, 1995);
verify(res[7], 8, 1995);
verify(res[8], 11, 1993);
verify(res[9], 11, 1993);
verify(res[10], 11, 1993);
verify(res[11], 12, 1991);
verify(res[12], 13, 1990);
verify(res[13], 15, 1986);
verify(res[14], 15, 1986);
verify(res[15], 16, 1985);
verify(res[16], 17, 1980);
verify(res[17], 19, 1972);
verify(res[18], 19, 1972);
verify(res[19], 20, 1959);
verify(res[20], 21, 1958);
});
test('ordinal ranking', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'ordinal',
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 2, 2003);
verify(res[2], 3, 2003);
verify(res[3], 4, 2001);
verify(res[4], 5, 1995);
verify(res[5], 6, 1995);
verify(res[6], 7, 1995);
verify(res[7], 8, 1995);
verify(res[8], 9, 1993);
verify(res[9], 10, 1993);
verify(res[10], 11, 1993);
verify(res[11], 12, 1991);
verify(res[12], 13, 1990);
verify(res[13], 14, 1986);
verify(res[14], 15, 1986);
verify(res[15], 16, 1985);
verify(res[16], 17, 1980);
verify(res[17], 18, 1972);
verify(res[18], 19, 1972);
verify(res[19], 20, 1959);
verify(res[20], 21, 1958);
});
test('fractional ranking', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'fractional',
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 2.5, 2003);
verify(res[2], 2.5, 2003);
verify(res[3], 4, 2001);
verify(res[4], 6.5, 1995);
verify(res[5], 6.5, 1995);
verify(res[6], 6.5, 1995);
verify(res[7], 6.5, 1995);
verify(res[8], 10, 1993);
verify(res[9], 10, 1993);
verify(res[10], 10, 1993);
verify(res[11], 12, 1991);
verify(res[12], 13, 1990);
verify(res[13], 14.5, 1986);
verify(res[14], 14.5, 1986);
verify(res[15], 16, 1985);
verify(res[16], 17, 1980);
verify(res[17], 18.5, 1972);
verify(res[18], 18.5, 1972);
verify(res[19], 20, 1959);
verify(res[20], 21, 1958);
});
test('rank in ascending order', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'competition',
reverse: true,
});
expect(res.length).toBe(languages.length);
verify(res[0], 1, 1958);
verify(res[1], 2, 1959);
verify(res[2], 3, 1972);
verify(res[3], 3, 1972);
verify(res[4], 5, 1980);
verify(res[5], 6, 1985);
verify(res[6], 7, 1986);
verify(res[7], 7, 1986);
verify(res[8], 9, 1990);
verify(res[9], 10, 1991);
verify(res[10], 11, 1993);
verify(res[11], 11, 1993);
verify(res[12], 11, 1993);
verify(res[13], 14, 1995);
verify(res[14], 14, 1995);
verify(res[15], 14, 1995);
verify(res[16], 14, 1995);
verify(res[17], 18, 2001);
verify(res[18], 19, 2003);
verify(res[19], 19, 2003);
verify(res[20], 21, 2009);
});
test('start ranking at 5', () => {
const res = ranked.ranking(languages, scoreFn, {
strategy: 'competition',
reverse: true,
start: 5,
});
expect(res.length).toBe(languages.length);
verify(res[0], 5, 1958);
verify(res[1], 6, 1959);
verify(res[2], 7, 1972);
verify(res[3], 7, 1972);
verify(res[4], 9, 1980);
verify(res[5], 10, 1985);
verify(res[6], 11, 1986);
verify(res[7], 11, 1986);
verify(res[8], 13, 1990);
verify(res[9], 14, 1991);
verify(res[10], 15, 1993);
verify(res[11], 15, 1993);
verify(res[12], 15, 1993);
verify(res[13], 18, 1995);
verify(res[14], 18, 1995);
verify(res[15], 18, 1995);
verify(res[16], 18, 1995);
verify(res[17], 22, 2001);
verify(res[18], 23, 2003);
verify(res[19], 23, 2003);
verify(res[20], 25, 2009);
});
});
describe('legacy environments', () => {
// Simulate a legacy environment so that the polyfills are applied
Array.prototype.fill = null;
Object.entries = null;
// Apply polyfills
require('./polyfills')();
test('provide the correct polyfills', () => {
const res = ranked.ranking(languages, scoreFn);
expect(res.length).toBe(languages.length);
verify(res[0], 1, 2009);
verify(res[1], 2, 2003);
verify(res[2], 2, 2003);
verify(res[3], 4, 2001);
verify(res[4], 5, 1995);
verify(res[5], 5, 1995);
verify(res[6], 5, 1995);
verify(res[7], 5, 1995);
verify(res[8], 9, 1993);
verify(res[9], 9, 1993);
verify(res[10], 9, 1993);
verify(res[11], 12, 1991);
verify(res[12], 13, 1990);
verify(res[13], 14, 1986);
verify(res[14], 14, 1986);
verify(res[15], 16, 1985);
verify(res[16], 17, 1980);
verify(res[17], 18, 1972);
verify(res[18], 18, 1972);
verify(res[19], 20, 1959);
verify(res[20], 21, 1958);
});
});