node-postgres/packages/pg-query-stream/test/concat.js

var assert = require('assert');
var concat = require('concat-stream');
var through = require('through');
var helper = require('./helper');

var QueryStream = require('../');

helper('concat', function (client) {
  it('concats correctly', function (done) {
    var stream = new QueryStream('SELECT * FROM generate_series(0, 200) num', []);
    var query = client.query(stream);
    query
      .pipe(
        through(function (row) {
          this.push(row.num);
        })
      )
      .pipe(
        concat(function (result) {
          var total = result.reduce(function (prev, cur) {
            return prev + cur;
          });
          assert.equal(total, 20100);
        })
      );
    stream.on('end', done);
  });
});