forked from lix-project/lix-website
63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
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'use strict';
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var inspect = require('object-inspect');
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var forEach = require('for-each');
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var v = require('es-value-fixtures');
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module.exports = function (groupBy, t) {
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t.test('callback function', function (st) {
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forEach(v.nonFunctions, function (nonFunction) {
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st['throws'](
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function () { groupBy([], nonFunction); },
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TypeError,
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inspect(nonFunction) + ' is not a function'
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);
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});
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st.end();
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});
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t.test('grouping', function (st) {
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st.deepEqual(
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groupBy([], function () { return 'a'; }),
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{ __proto__: null },
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'an empty array produces an empty object'
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);
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var arr = [0, -0, 1, 2, 3, 4, 5, NaN, Infinity, -Infinity];
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var parity = function (x) {
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if (x !== x) {
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return void undefined;
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}
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if (!isFinite(x)) {
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return '∞';
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}
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return x % 2 === 0 ? 'even' : 'odd';
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};
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var grouped = {
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__proto__: null,
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even: [0, -0, 2, 4],
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odd: [1, 3, 5],
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undefined: [NaN],
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'∞': [Infinity, -Infinity]
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};
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st.deepEqual(
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groupBy(arr, parity),
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grouped,
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inspect(arr) + ' group by parity groups to ' + inspect(grouped)
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);
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st.deepEqual(
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groupBy(arr, function (x, i) {
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st.equal(this, undefined, 'receiver is as expected'); // eslint-disable-line no-invalid-this
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st.equal(x, arr[i], 'second argument ' + i + ' is ' + inspect(arr[i]));
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return 42;
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}),
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{ __proto__: null, 42: arr },
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'thisArg and callback arguments are as expected'
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);
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st.end();
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});
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};
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