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chunk-spec.js
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chunk-spec.js
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'use strict';
var assert = require('assert');
var stream = require('stream');
var Chunk = require('./chunk');
describe('Chunk', function () {
describe('hasNext', function () {
it('returns true before data is available', function () {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
assert(c.hasNext());
});
it('returns true after data is available', function () {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end('abc');
assert(c.hasNext());
});
it('returns false after all data has been read', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end();
c.next(function (chunk) {
assert(!chunk.hasNext());
}).done(done);
});
});
describe('next', function () {
describe('error', function () {
it('catches errors before the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var e = new Error('MEH!');
s.emit('error', e);
c.next(null, function (err) {
assert.equal(err, e);
done();
});
});
it('catches errors after the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var e = new Error('MEH!');
c.next(null, function (err) {
assert.equal(err, e);
done();
});
s.emit('error', e);
});
it('catches error in the long form (next-then)', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var e = new Error('MEH!');
c.next().then(null, function (err) {
assert.equal(err, e);
done();
});
s.emit('error', e);
});
it('catches error in a second handler', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d = new Buffer('MEH!');
var e = new Error('MEH!');
c.next(function (chunk) {
assert.equal(chunk.data, d);
chunk.next(null, function (err) {
assert.equal(err, e);
done();
});
});
s.write(d);
s.emit('error', e);
});
});
describe('data', function () {
it('gets data emitted before the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d = new Buffer('MEH!');
s.write(d);
c.next(function (chunk) {
assert.equal(chunk.data, d);
done();
});
});
it('gets data emitted after the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d = new Buffer('MEH!');
c.next(function (chunk) {
assert.equal(chunk.data, d);
done();
});
s.write(d);
});
it('gets data in the long form (next-then)', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d = new Buffer('MEH!');
c.next().then(function (chunk) {
assert.equal(chunk.data, d);
done();
});
s.write(d);
});
it('gets data in a second handler', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d1 = new Buffer('MEH!1');
var d2 = new Buffer('MEH!2');
c.next(function (chunk1) {
assert.equal(chunk1.data, d1);
chunk1.next(function (chunk2) {
assert.equal(chunk2.data, d2);
done();
});
});
s.write(d1);
s.write(d2);
});
});
describe('end', function () {
it('gets end emitted before the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end();
c.next(function (chunk) {
assert(!chunk.hasNext());
done();
});
});
it('gets end emitted after the next request', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
c.next(function (chunk) {
assert(!chunk.hasNext());
done();
});
s.end();
});
it('gets end in the long form (next-then)', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
c.next().then(function (chunk) {
assert(!chunk.hasNext());
done();
});
s.end();
});
it('gets end in a second handler', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
var d = new Buffer('MEH!');
c.next(function (chunk1) {
assert.equal(chunk1.data, d);
chunk1.next(function (chunk2) {
assert(!chunk2.hasNext());
done();
});
});
s.end(d);
});
});
});
describe('hasNextAvailable', function () {
it('returns false before data is available', function () {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
assert(!c.hasNextAvailable());
});
it('returns true after data is available', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end('abc');
c.next(function () {
assert(c.hasNextAvailable());
}).done(done);
});
it('returns false after all data has been read', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end();
c.next(function (chunk) {
assert(!chunk.hasNextAvailable());
}).done(done);
});
});
describe('nextAvailable', function () {
it('returns null before data is available', function () {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
assert.equal(c.nextAvailable(), null);
});
it('returns data after data is available', function (done) {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.end('abc');
c.next(function (chunk) {
assert.equal(c.nextAvailable(), chunk);
}).done(done);
});
it('throws after a stream error', function () {
var s = new stream.PassThrough();
var c = new Chunk(null, s);
s.emit('error', new Error('MEH!'));
assert.throws(function () {
c.nextAvailable();
});
});
});
});