'use strict';
  
  // stdlib
  var tap = require('tap');
  var test = tap.test;
  var EventEmitter = require('events').EventEmitter;
  
  // module under test
  var context = require('../context.js');
  
  // multiple contexts in use
  var tracer = context.createNamespace('tracer');
  
  function Trace(harvester) {
    this.harvester = harvester;
  }
  
  Trace.prototype.runHandler = function (callback) {
    var wrapped = tracer.bind(function () {
      callback();
      this.harvester.emit('finished', tracer.get('transaction'));
    }.bind(this));
    wrapped();
  };
  
  
  test("simple tracer built on contexts", function (t) {
    t.plan(6);
  
    var harvester = new EventEmitter();
    var trace = new Trace(harvester);
  
    harvester.on('finished', function (transaction) {
      t.ok(transaction, "transaction should have been passed in");
      t.equal(transaction.status, 'ok', "transaction should have finished OK");
      t.equal(Object.keys(process.namespaces).length, 1, "Should only have one namespace.");
    });
  
    trace.runHandler(function inScope() {
      t.ok(tracer.active, "tracer should have an active context");
      tracer.set('transaction', {status : 'ok'});
      t.ok(tracer.get('transaction'), "can retrieve newly-set value");
      t.equal(tracer.get('transaction').status, 'ok', "value should be correct");
    });
  });