node-postgres/test/integration/connection-pool/error-tests.js

var helper = require(__dirname + "/../test-helper");
var pg = require(__dirname + "/../../../lib");
helper.pg = pg;

var conString = helper.connectionString();

//first make pool hold 2 clients
pg.defaults.poolSize = 2;

var killIdleQuery = 'SELECT procpid, (SELECT pg_terminate_backend(procpid)) AS killed FROM pg_stat_activity WHERE current_query LIKE \'<IDLE>\'';

//get first client
pg.connect(conString, assert.success(function(client) {
  client.id = 1;
  pg.connect(conString, assert.success(function(client2) {
    client2.id = 2;
    //subscribe to the pg error event
    assert.emits(pg, 'error', function(error, brokenClient) {
      assert.ok(error);
      assert.ok(brokenClient);
      assert.equal(client.id, brokenClient.id);
      pg.end();
    });
    //kill the connection from client
    client2.query(killIdleQuery, assert.success(function(res) {
      //check to make sure client connection actually was killed
      assert.length(res.rows, 1);
    }));
  }));
}));