Current Dev State

static/js/ketcher2/node_modules/ordered-read-streams/test/main.js

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+var should = require('should');
+var through = require('through2');
+var OrderedStreams = require('../');
+
+describe('ordered-read-streams', function () {
+  it('should end if no streams are given', function (done) {
+    var streams = OrderedStreams();
+    streams.on('data', function () {
+      done('error');
+    });
+    streams.on('end', done);
+  });
+
+  it('should throw error if one or more streams are not readable', function (done) {
+    var writable = { readable: false };
+
+    try {
+      new OrderedStreams(writable);
+    } catch (e) {
+      e.message.should.equal('All input streams must be readable');
+      done();
+    }
+  });
+
+  it('should emit data from all streams', function(done) {
+    var s1 = through.obj(function (data, enc, next) {
+      this.push(data);
+      next();
+    });
+    var s2 = through.obj(function (data, enc, next) {
+      this.push(data);
+      next();
+    });
+    var s3 = through.obj(function (data, enc, next) {
+      this.push(data);
+      next();
+    });
+
+    var streams = new OrderedStreams([s1, s2, s3]);
+    var results = [];
+    streams.on('data', function (data) {
+      results.push(data);
+    });
+    streams.on('end', function () {
+      results.length.should.be.exactly(3);
+      results[0].should.equal('stream 1');
+      results[1].should.equal('stream 2');
+      results[2].should.equal('stream 3');
+      done();
+    });
+
+    s1.write('stream 1');
+    s1.end();
+
+    s2.write('stream 2');
+    s2.end();
+
+    s3.write('stream 3');
+    s3.end();
+  });
+
+  it('should emit all data event from each stream', function (done) {
+    var s = through.obj(function (data, enc, next) {
+      this.push(data);
+      next();
+    });
+
+    var streams = new OrderedStreams(s);
+    var results = [];
+    streams.on('data', function (data) {
+      results.push(data);
+    });
+    streams.on('end', function () {
+      results.length.should.be.exactly(3);
+      done();
+    });
+
+    s.write('data1');
+    s.write('data2');
+    s.write('data3');
+    s.end();
+  });
+
+  it('should preserve streams order', function(done) {
+    var s1 = through.obj(function (data, enc, next) {
+      var self = this;
+      setTimeout(function () {
+        self.push(data);
+        next();
+      }, 200);
+    });
+    var s2 = through.obj(function (data, enc, next) {
+      var self = this;
+      setTimeout(function () {
+        self.push(data);
+        next();
+      }, 30);
+    });
+    var s3 = through.obj(function (data, enc, next) {
+      var self = this;
+      setTimeout(function () {
+        self.push(data);
+        next();
+      }, 100);
+    });
+
+    var streams = new OrderedStreams([s1, s2, s3]);
+    var results = [];
+    streams.on('data', function (data) {
+      results.push(data);
+    });
+    streams.on('end', function () {
+      results.length.should.be.exactly(3);
+      results[0].should.equal('stream 1');
+      results[1].should.equal('stream 2');
+      results[2].should.equal('stream 3');
+      done();
+    });
+
+    s1.write('stream 1');
+    s1.end();
+
+    s2.write('stream 2');
+    s2.end();
+
+    s3.write('stream 3');
+    s3.end();
+  });
+
+  it('should emit stream errors downstream', function (done) {
+    var s = through.obj(function (data, enc, next) {
+      this.emit('error', new Error('stahp!'));
+      next();
+    });
+    var s2 = through.obj(function (data, enc, next) {
+      this.push(data);
+      next();
+    });
+
+    var errMsg;
+    var streamData;
+    var streams = new OrderedStreams([s, s2]);
+    streams.on('data', function (data) {
+      streamData = data;
+    });
+    streams.on('error', function (err) {
+      errMsg = err.message;
+    });
+    streams.on('end', function () {
+      errMsg.should.equal('stahp!');
+      streamData.should.equal('Im ok!');
+      done();
+    });
+
+    s.write('go');
+    s.end();
+    s2.write('Im ok!');
+    s2.end();
+  });
+});