just/test/array-group-by/index.js at tape5 · hmmhmmhm/just

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var test = require('../util/test')(__filename);

var groupBy = require('../../packages/array-group-by');

test('throws if first argument is not an array', function(t) {

t.plan(6);

t.throws(function() {

groupBy({}, function() {});

});

t.throws(function() {

groupBy('hello', function() {});

});

t.throws(function() {

groupBy(/hullo/, function() {});

});

t.throws(function() {

groupBy(null, function() {});

});

t.throws(function() {

groupBy(undefined, function() {});

});

t.throws(function() {

groupBy();

});

t.end();

});

test('throws if second argument is not a function', function(t) {

t.plan(6);

t.throws(function() {

groupBy([], {});

});

t.throws(function() {

groupBy([], []);

});

t.throws(function() {

groupBy([], /hullo/);

});

t.throws(function() {

groupBy([], null);

});

t.throws(function() {

groupBy([], undefined);

});

t.throws(function() {

groupBy([]);

});

t.end();

});

test('should return grouped objects', function(t) {

t.plan(2);

var result1 = groupBy([6.1, 4.2, 6.3], Math.floor);

t.deepEqual(result1, {'4': [4.2], '6': [6.1, 6.3]});

var result2 = groupBy([1, 2, 3, 4, 5, 6, 7, 8], function(i) { return i % 2; });

t.deepEqual(result2, {'0': [2, 4, 6, 8], '1': [1, 3, 5, 7]});

t.end();

});

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