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upcast.js
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upcast.js
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/*jshint maxlen: 140 */
/*global afterEach, beforeEach, describe, it */
(function () {
'use strict';
// Dependencies
var assert = require('proclaim');
var sinon = require('sinon');
// Test subject
var upcast = require('../../lib/upcast');
// Test suite
describe('upcast', function () {
beforeEach(function (done) {
// Nasty hack to prevent stack space errors in IE
// https://github.com/visionmedia/mocha/issues/502
// (also function wrapper fixes error in Firefox 3.6)
setTimeout(function () {
done();
}, 0);
});
it('should be an object', function () {
assert.isObject(upcast);
});
describe('.type()', function () {
it('should be a function', function () {
assert.isFunction(upcast.type);
});
function testType (desc, type, values) {
it(desc, function () {
var i, len = values.length;
for (i = 0; i < len; i ++) {
assert.strictEqual(upcast.type(values[i]), type);
}
});
}
testType('should return the expected type when called with an array', 'array', [[1, 2, 3], []]);
testType('should return the expected type when called with a boolean', 'boolean', [true, false]);
testType('should return the expected type when called with a function', 'function', [function () {}]);
testType('should return the expected type when called with null', 'null', [null]);
testType('should return the expected type when called with a number', 'number', [12, 1.2, NaN, Infinity]);
testType('should return the expected type when called with an object', 'object', [{}]);
testType('should return the expected type when called with a string', 'string', ['foo', '']);
testType('should return the expected type when called with undefined', 'undefined', [undefined]);
});
describe('.is()', function () {
beforeEach(function () {
sinon.stub(upcast, 'type');
upcast.type.withArgs('foo').returns('type1');
upcast.type.withArgs('bar').returns('type2');
});
afterEach(function () {
upcast.type.restore();
});
it('should be a function', function () {
assert.isFunction(upcast.is);
});
it('should utilise the type function', function () {
upcast.is('foo', 'type1');
assert.isTrue(upcast.type.calledOnce);
});
it('should return true when called with the correct type', function () {
assert.isTrue(upcast.is('foo', 'type1'));
});
it('should return false when called with the incorrect type', function () {
assert.isFalse(upcast.is('bar', 'type1'));
});
it('should throw when called with a non-string type', function () {
assert.throws(function () {
upcast.is('bar', 123);
}, /invalid argument: type/i);
});
it('should resolve type aliases', function () {
upcast.type.withArgs([]).returns('array');
upcast.alias.seq = 'array';
assert.isTrue(upcast.is([], 'seq'));
});
});
describe('.to()', function () {
var testFn = function () {};
testFn.foo = 'bar';
it('should be a function', function () {
assert.isFunction(upcast.to);
});
function testTo (desc, type, pairs) {
it(desc, function () {
var i, len = pairs.length, pair;
for (i = 0; i < len; i ++) {
pair = pairs[i];
if (isNaN(pair.to)) {
assert.isTrue(isNaN(upcast.to(pair.from, type)));
} else {
assert.deepEqual(upcast.to(pair.from, type), pair.to);
}
}
});
}
function testToFn (desc, pairs) {
it(desc, function () {
var i, len = pairs.length, pair;
for (i = 0; i < len; i ++) {
pair = pairs[i];
if (isNaN(pair)) {
assert.isTrue(isNaN(upcast.to(pair, 'function')));
} else {
assert.deepEqual(upcast.to(pair, 'function')(), pair);
}
}
});
}
testTo('should convert to arrays correctly', 'array', [
{ from: ['a', 'b', 'c'], to: ['a', 'b', 'c'] },
{ from: [1, 2, 3], to: [1, 2, 3] },
{ from: [], to: [] },
{ from: true, to: [true] },
{ from: false, to: [false] },
{ from: testFn, to: [testFn] },
{ from: null, to: [] },
{ from: 123, to: [123] },
{ from: NaN, to: [NaN] },
{ from: Infinity, to: [Infinity] },
{ from: {foo: 'bar'}, to: [{foo: 'bar'}] },
{ from: 'foo', to: ['f', 'o', 'o'] },
{ from: '', to: [] },
{ from: undefined, to: [] }
]);
testTo('should convert to booleans correctly', 'boolean', [
{ from: ['a', 'b', 'c'], to: true },
{ from: [1, 2, 3], to: true },
{ from: [], to: false },
{ from: true, to: true },
{ from: false, to: false },
{ from: testFn, to: true },
{ from: null, to: false },
{ from: 123, to: true },
{ from: 0, to: false },
{ from: NaN, to: false },
{ from: Infinity, to: true },
{ from: {foo: 'bar'}, to: true },
{ from: 'foo', to: true },
{ from: '', to: false },
{ from: undefined, to: false }
]);
testToFn('should convert to functions correctly', [
['a', 'b', 'c'],
[1, 2, 3],
[],
true,
false,
null,
123,
0,
NaN,
Infinity,
{foo: 'bar'},
'foo',
'',
undefined
]);
testTo('should convert to null correctly', 'null', [
{ from: ['a', 'b', 'c'], to: null },
{ from: [1, 2, 3], to: null },
{ from: [], to: null },
{ from: true, to: null },
{ from: false, to: null },
{ from: testFn, to: null },
{ from: null, to: null },
{ from: 123, to: null },
{ from: 0, to: null },
{ from: NaN, to: null },
{ from: Infinity, to: null },
{ from: {foo: 'bar'}, to: null },
{ from: 'foo', to: null },
{ from: '', to: null },
{ from: undefined, to: null }
]);
testTo('should convert to numbers correctly', 'number', [
{ from: ['a', 'b', 'c'], to: 0 },
{ from: [1, 2, 3], to: 123 },
{ from: [], to: 0 },
{ from: true, to: 1 },
{ from: false, to: 0 },
{ from: testFn, to: NaN },
{ from: null, to: 0 },
{ from: 123, to: 123 },
{ from: 1.23, to: 1.23 },
{ from: '123', to: 123 },
{ from: '1.23', to: 1.23 },
{ from: NaN, to: NaN },
{ from: Infinity, to: Infinity },
{ from: {foo: 'bar'}, to: NaN },
{ from: 'foo', to: 0 },
{ from: '', to: 0 },
{ from: undefined, to: 0 }
]);
testTo('should convert to objects correctly', 'object', [
{ from: ['a', 'b', 'c'], to: {0: 'a', 1: 'b', 2: 'c'} },
{ from: [1, 2, 3], to: {0: 1, 1: 2, 2: 3} },
{ from: [], to: [] },
{ from: true, to: Object(true) },
{ from: false, to: Object(false) },
{ from: testFn, to: testFn },
{ from: null, to: {} },
{ from: 123, to: Object(123) },
{ from: NaN, to: {} },
{ from: Infinity, to: Object(Infinity) },
{ from: {foo: 'bar'}, to: {foo: 'bar'} },
{ from: 'foo', to: {0: 'f', 1: 'o', 2: 'o'} },
{ from: '', to: Object('') },
{ from: undefined, to: {} }
]);
testTo('should convert to strings correctly', 'string', [
{ from: ['a', 'b', 'c'], to: 'abc' },
{ from: [1, 2, 3], to: '123' },
{ from: [], to: '' },
{ from: true, to: 'true' },
{ from: false, to: 'false' },
{ from: testFn, to: 'function () {}' },
{ from: null, to: '' },
{ from: 123, to: '123' },
{ from: NaN, to: 'NaN' },
{ from: Infinity, to: 'Infinity' },
{ from: {foo: 'bar'}, to: '[object Object]' },
{ from: 'foo', to: 'foo' },
{ from: '', to: '' },
{ from: undefined, to: '' }
]);
testTo('should convert to undefined correctly', 'undefined', [
{ from: ['a', 'b', 'c'], to: undefined },
{ from: [1, 2, 3], to: undefined },
{ from: [], to: undefined },
{ from: true, to: undefined },
{ from: false, to: undefined },
{ from: testFn, to: undefined },
{ from: null, to: undefined },
{ from: 123, to: undefined },
{ from: 0, to: undefined },
{ from: NaN, to: undefined },
{ from: Infinity, to: undefined },
{ from: {foo: 'bar'}, to: undefined },
{ from: 'foo', to: undefined },
{ from: '', to: undefined },
{ from: undefined, to: undefined }
]);
it('should throw when called with a non-string type', function () {
assert.throws(function () {
upcast.to('bar', 123);
}, /invalid argument: type/i);
});
it('should resolve type aliases', function () {
upcast.alias.seq = 'array';
assert.deepEqual(upcast.to('foo', 'seq'), ['f', 'o', 'o']);
});
it('should guard against types without casters', function () {
assert.deepEqual(upcast.to('foo', 'poo'), 'foo');
});
});
});
} ());