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110 lines
2.3 KiB
110 lines
2.3 KiB
6 years ago
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var expect = require('chai').expect
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, unique = require('..')
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, Stream = require('stream')
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, after = require('after')
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, setImmediate = global.setImmediate || process.nextTick;
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describe('unique stream', function() {
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function makeStream(type) {
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var s = new Stream();
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s.readable = true;
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var n = 10;
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var next = after(n, function () {
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setImmediate(function () {
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s.emit('end');
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});
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});
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for (var i = 0; i < n; i++) {
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var o = {
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type: type,
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name: 'name ' + i,
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number: i * 10
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};
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(function (o) {
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setImmediate(function () {
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s.emit('data', o);
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next();
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});
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})(o);
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}
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return s;
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}
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it('should be able to uniqueify objects based on JSON data', function(done) {
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var aggregator = unique();
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makeStream('a')
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.pipe(aggregator);
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makeStream('a')
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.pipe(aggregator);
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var n = 0;
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aggregator
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.on('data', function () {
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n++;
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})
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.on('end', function () {
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expect(n).to.equal(10);
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done();
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});
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});
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it('should be able to uniqueify objects based on a property', function(done) {
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var aggregator = unique('number');
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makeStream('a')
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.pipe(aggregator);
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makeStream('b')
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.pipe(aggregator);
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var n = 0;
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aggregator
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.on('data', function () {
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n++;
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})
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.on('end', function () {
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expect(n).to.equal(10);
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done();
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});
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});
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it('should be able to uniqueify objects based on a function', function(done) {
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var aggregator = unique(function (data) {
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return data.name;
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});
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makeStream('a')
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.pipe(aggregator);
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makeStream('b')
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.pipe(aggregator);
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var n = 0;
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aggregator
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.on('data', function () {
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n++;
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})
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.on('end', function () {
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expect(n).to.equal(10);
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done();
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});
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});
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it('should be able to handle uniqueness when not piped', function(done) {
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var stream = unique();
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var count = 0;
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stream.on('data', function (data) {
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expect(data).to.equal('hello');
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count++;
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});
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stream.on('end', function() {
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expect(count).to.equal(1);
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done();
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});
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stream.write('hello');
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stream.write('hello');
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stream.end();
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});
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});
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