Add a test to try to identify file descriptor leaks across nginx reloads

See: 18F/api.data.gov#188

test/integration/processes.js

@@ -0,0 +1,67 @@
+'use strict';
+
+require('../test_helper');
+
+var _ = require('lodash'),
+    apiUmbrellaConfig = require('api-umbrella-config'),
+    async = require('async'),
+    execFile = require('child_process').execFile,
+    Factory = require('factory-lady'),
+    fs = require('fs'),
+    ipaddr = require('ipaddr.js'),
+    mongoose = require('mongoose'),
+    path = require('path'),
+    processEnv = require('../../lib/process_env'),
+    request = require('request'),
+    Tail = require('tail').Tail;
+
+var config = apiUmbrellaConfig.load(path.resolve(__dirname, '../config/test.yml'));
+
+describe('server processes', function() {
+  describe('nginx', function() {
+    it('does not leak file descriptors across reloads', function(done) {
+      this.timeout(30000);
+
+      var configPath = processEnv.supervisordConfigPath();
+      var execOpts = { env: processEnv.env() };
+      execFile('supervisorctl', ['-c', configPath, 'pid', 'router-nginx'], execOpts, function(error, stdout, stderr) {
+        if(error) {
+          return done('Error fetching nginx pid: ' + error.message + '\n\nSTDOUT: ' + stdout + '\n\nSTDERR:' + stderr);
+        }
+
+        var parentPid = stdout.trim();
+
+        async.timesSeries(10, function(index, next) {
+          execFile('supervisorctl', ['-c', configPath, 'kill', 'HUP', 'router-nginx'], execOpts, function(error, stdout, stderr) {
+            if(error) {
+              return next('Error reloading nginx: ' + error.message + '\n\nSTDOUT: ' + stdout + '\n\nSTDERR:' + stderr);
+            }
+
+            setTimeout(function() {
+              execFile('lsof', ['-R', '-c', 'nginx'], execOpts, function(error, stdout, stderr) {
+                if(error) {
+                  return next('Error gathering lsof details: ' + error.message + '\n\nSTDOUT: ' + stdout + '\n\nSTDERR:' + stderr);
+                }
+
+                var lines = _.filter(stdout.split('\n'), function(line) {
+                  var columns = line.split(/\s+/);
+                  return columns[2] == parentPid;
+                });
+                setTimeout(function() {
+                  next(null, lines.length);
+                }, 500);
+              });
+            }, 500);
+          });
+        }, function(error, descriptorCounts) {
+          if(error) {
+            return done(error);
+          }
+
+          _.uniq(descriptorCounts).length.should.eql(1);
+          done();
+        });
+      });
+    });
+  });
+});