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collection.js
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collection.js
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const assert = require('assert');
const hbs = require('handlebars').create();
const helpers = require('..');
helpers.array({ handlebars: hbs });
helpers.collection({ handlebars: hbs });
helpers.string({ handlebars: hbs });
const context = {array: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']};
describe('collection', function() {
describe('isEmpty block helper', function() {
it('should render the first block when an array is empty', function() {
const fn = hbs.compile('{{#isEmpty array}}AAA{{else}}BBB{{/isEmpty}}');
assert.equal(fn({array: []}), 'AAA');
});
it('should render the first block when the value is null', function() {
const fn = hbs.compile('{{#isEmpty}}AAA{{else}}BBB{{/isEmpty}}');
assert.equal(fn({array: []}), 'AAA');
});
it('should render the second block when an array is not empty', function() {
const fn = hbs.compile('{{#isEmpty array}}AAA{{else}}BBB{{/isEmpty}}');
assert.equal(fn(context), 'BBB');
});
it('should render the second block when an object is not empty', function() {
const fn = hbs.compile('{{#isEmpty object}}AAA{{else}}BBB{{/isEmpty}}');
assert.equal(fn({object: {foo: 'bar'}}), 'BBB');
});
it('should render the first block when an object is empty', function() {
const fn = hbs.compile('{{#isEmpty object}}AAA{{else}}BBB{{/isEmpty}}');
assert.equal(fn({object: {}}), 'AAA');
});
});
describe('isEmpty inline helper', function() {
it('should render the first block when an array is empty', function() {
const fn = hbs.compile('{{isEmpty array}}');
assert.equal(fn({array: []}), 'true');
});
it('should render the first block when the value is null', function() {
const fn = hbs.compile('{{isEmpty}}');
assert.equal(fn({array: []}), 'true');
});
it('should render the second block when an array is not empty', function() {
const fn = hbs.compile('{{isEmpty array}}');
assert.equal(fn(context), 'false');
});
it('should render the second block when an object is not empty', function() {
const fn = hbs.compile('{{isEmpty object}}');
assert.equal(fn({object: {foo: 'bar'}}), 'false');
});
it('should render the first block when an object is empty', function() {
const fn = hbs.compile('{{isEmpty object}}');
assert.equal(fn({object: {}}), 'true');
});
});
describe('length', function() {
it('should return the length of the array', function() {
const fn = hbs.compile('{{length array}}');
assert.equal(fn(context), '8');
});
it('should return zero when undefined', function() {
assert.equal(hbs.compile('{{length}}')(), '0');
});
it('should return the length of a string', function() {
const fn = hbs.compile('{{length "foo"}}');
assert.equal(fn(context), '3');
});
it('should work with arrays passed via subexpression', function() {
const fn = hbs.compile('{{length (split "b,c,a")}}');
assert.equal(fn(context), '3');
});
it('should return 0 when the array is invalid:', function() {
const fn = hbs.compile('{{length foo}}');
assert.equal(fn(context), '0');
});
it('should return 0 when the value is not an array:', function() {
const fn = hbs.compile('{{length foo}}');
assert.equal(fn({foo: {}}), '0');
});
});
});