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var async = require('../lib');
var {expect} = require('chai');
describe('transform', () => {
it('transform implictly determines memo if not provided', (done) => {
async.transform([1,2,3], (memo, x, v, callback) => {
memo.push(x + 1);
callback();
}, (err, result) => {
expect(result).to.eql([2, 3, 4]);
done();
});
});
it('transform async with object memo', (done) => {
async.transform([1,3,2], {}, (memo, v, k, callback) => {
setTimeout(() => {
memo[k] = v;
callback();
});
}, (err, result) => {
expect(err).to.equal(null);
expect(result).to.eql({
0: 1,
1: 3,
2: 2
});
done();
});
});
it('transform iterating object', (done) => {
async.transform({a: 1, b: 3, c: 2}, (memo, v, k, callback) => {
setTimeout(() => {
memo[k] = v + 1;
callback();
});
}, (err, result) => {
expect(err).to.equal(null);
expect(result).to.eql({a: 2, b: 4, c: 3});
done();
});
});
it('transform error', (done) => {
async.transform([1,2,3], (a, v, k, callback) => {
callback('error');
}, (err) => {
expect(err).to.equal('error');
done();
});
});
it('transform canceled', (done) => {
var call_order = [];
async.transform([1,2,3], (a, v, k, callback) => {
call_order.push(v);
a.push(v + 1);
callback(v === 2 ? false : null);
}, () => {
throw new Error('should not get here');
});
setTimeout(() => {
expect(call_order).to.eql([1, 2, 3]);
done();
}, 25);
});
it('transform with two arguments', (done) => {
try {
async.transform([1, 2, 3], (a, v, k, callback) => {
callback();
});
done();
} catch (e) {
expect.fail();
}
});
});
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