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