node-postgres/packages/pg-cursor/test/no-data-handling.js

const assert = require('assert');
const pg = require('pg');
const Cursor = require('../');

describe('queries with no data', function () {
  beforeEach(function (done) {
    const client = (this.client = new pg.Client());
    client.connect(done);
  });

  afterEach(function () {
    this.client.end();
  });

  it('handles queries that return no data', function (done) {
    const cursor = new Cursor('CREATE TEMPORARY TABLE whatwhat (thing int)');
    this.client.query(cursor);
    cursor.read(100, function (err, rows) {
      assert.ifError(err);
      assert.strictEqual(rows.length, 0);
      done();
    });
  });

  it('handles empty query', function (done) {
    let cursor = new Cursor('-- this is a comment');
    cursor = this.client.query(cursor);
    cursor.read(100, function (err, rows) {
      assert.ifError(err);
      assert.strictEqual(rows.length, 0);
      done();
    });
  });
});