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var async = require('../lib');
var expect = require('chai').expect;
describe('transform', function() {
it('transform implictly determines memo if not provided', function(done) {
async.transform([1,2,3], function(memo, x, v, callback){
memo.push(x + 1);
callback();
}, function(err, result){
expect(result).to.eql([2, 3, 4]);
done();
});
});
it('transform async with object memo', function(done) {
async.transform([1,3,2], {}, function(memo, v, k, callback){
setTimeout(function() {
memo[k] = v;
callback();
});
}, function(err, result) {
expect(err).to.equal(null);
expect(result).to.eql({
0: 1,
1: 3,
2: 2
});
done();
});
});
it('transform iterating object', function(done) {
async.transform({a: 1, b: 3, c: 2}, function(memo, v, k, callback){
setTimeout(function() {
memo[k] = v + 1;
callback();
});
}, function(err, result) {
expect(err).to.equal(null);
expect(result).to.eql({a: 2, b: 4, c: 3});
done();
});
});
it('transform error', function(done) {
async.transform([1,2,3], function(a, v, k, callback){
callback('error');
}, function(err){
expect(err).to.equal('error');
done();
});
});
it('transform with two arguments', function(done) {
try {
async.transform([1, 2, 3], function (a, v, k, callback) {
callback();
});
done();
} catch (e) {
expect.fail();
}
});
});
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