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151 lines (141 loc) · 4.08 KB
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'use strict';
var assert = require('./utils').assert;
var Func = require('../lib/Func');
describe('Func', function() {
describe('constructor', function() {
it('should be a function', function() {
assert.isFunction(Func);
});
it('should accept an object and initialise properly', function() {
var echo = function() {};
var func = new Func('echo', echo);
assert.equal(func.name, 'echo');
assert.strictEqual(func.handler, echo);
});
});
describe('#name', function() {
it('should be validated', function() {
new Func('test', function() {});
assert.throws(
function() {
new Func();
},
'"undefined" is not a valid function name'
);
assert.throws(
function() {
new Func(undefined);
},
'"undefined" is not a valid function name'
);
assert.throws(
function() {
new Func(null);
},
'"null" is not a valid function name'
);
assert.throws(
function() {
new Func(false);
},
'"false" is not a valid function name'
);
assert.throws(
function() {
new Func('');
},
'"" is not a valid function name'
);
});
});
describe('#handler', function() {
it('should be validated', function() {
new Func('test', function() {});
assert.throws(
function() {
new Func('test');
},
'Function handlers must be functions'
);
assert.throws(
function() {
new Func('test', {});
},
'Function handlers must be functions'
);
});
});
describe('#call()', function() {
it('the handler should be provided with a this context, data, and a callback', function(done) {
var context = {};
var data = {};
var func = new Func('test', function(_data, cb) {
assert.strictEqual(this, context);
assert.strictEqual(_data, data);
assert.isFunction(cb);
done();
});
func.call(context, data, function(){});
});
it('should convert all function output to strings', function(done) {
var object = new Func('test', function(data, cb) {
cb(null, {foo: [20]});
});
var number = new Func('test', function(data, cb) {
cb(null, 10);
});
object.call(null, null, function(err, output) {
assert.isNull(err);
assert.equal(output, JSON.stringify({foo: [20]}));
number.call(null, null, function(err, output) {
assert.isNull(err);
assert.equal(output, '10');
done();
});
});
});
it('should produce errors if the output is falsey', function(done) {
var _null = new Func('test', function(data, cb) {
cb(null, null);
});
var _undefined = new Func('test', function(data, cb) {
cb(null, undefined);
});
var _false = new Func('test', function(data, cb) {
cb(null, false);
});
var emptyString = new Func('test', function(data, cb) {
cb(null, '');
});
_null.call(null, null, function(err, output) {
assert.instanceOf(err, Error);
assert.isUndefined(output);
_undefined.call(null, null, function(err, output) {
assert.instanceOf(err, Error);
assert.isUndefined(output);
_false.call(null, null, function(err, output) {
assert.instanceOf(err, Error);
assert.isUndefined(output);
emptyString.call(null, null, function(err, output) {
assert.instanceOf(err, Error);
assert.isUndefined(output);
done();
});
});
});
});
});
it('can complete asynchronously', function(done) {
var func = new Func('test', function(data, cb) {
setTimeout(function() {
cb(null, 'delayed success');
}, 10);
});
func.call(null, null, function(err, output) {
assert.isNull(err);
assert.equal(output, 'delayed success');
done();
});
});
});
});