text: var async = require('../lib/async');
  
  
  exports['auto'] = function(test){
      var callOrder = [];
      var testdata = [{test: 'test'}];
      async.auto({
          task1: ['task2', function(callback){
              setTimeout(function(){
                  callOrder.push('task1');
                  callback();
              }, 25);
          }],
          task2: function(callback){
              setTimeout(function(){
                  callOrder.push('task2');
                  callback();
              }, 50);
          },
          task3: ['task2', function(callback){
              callOrder.push('task3');
              callback();
          }],
          task4: ['task1', 'task2', function(callback){
              callOrder.push('task4');
              callback();
          }]
      },
      function(err){
          test.same(callOrder, ['task2','task3','task1','task4']);
          test.done();
      });
  };
  
  exports['auto results'] = function(test){
      var callOrder = [];
      async.auto({
        task1: ['task2', function(callback, results){
            test.same(results.task2, 'task2');
            setTimeout(function(){
                callOrder.push('task1');
                callback(null, 'task1a', 'task1b');
            }, 25);
        }],
        task2: function(callback){
            setTimeout(function(){
                callOrder.push('task2');
                callback(null, 'task2');
            }, 50);
        },
        task3: ['task2', function(callback, results){
            test.same(results.task2, 'task2');
            callOrder.push('task3');
            callback(null);
        }],
        task4: ['task1', 'task2', function(callback, results){
            test.same(results.task1, ['task1a','task1b']);
            test.same(results.task2, 'task2');
            callOrder.push('task4');
            callback(null, 'task4');
        }]
      },
      function(err, results){
          test.same(callOrder, ['task2','task3','task1','task4']);
          test.same(results, {task1: ['task1a','task1b'], task2: 'task2', task3: undefined, task4: 'task4'});
          test.done();
      });
  };
  
  
  exports['auto empty object'] = function(test){
      async.auto({}, function(err){
          test.done();
      });
  };
  
  exports['auto error'] = function(test){
      test.expect(1);
      async.auto({
          task1: function(callback){
              callback('testerror');
          },
          task2: ['task1', function(callback){
              test.ok(false, 'task2 should not be called');
              callback();
          }],
          task3: function(callback){
              callback('testerror2');
          }
      },
      function(err){
          test.equals(err, 'testerror');
      });
      setTimeout(test.done, 100);
  };
  
  exports['auto no callback'] = function(test){
      async.auto({
          task1: function(callback){callback();},
          task2: ['task1', function(callback){callback(); test.done();}]
      });
  };
  
  exports['waterfall'] = function(test){
      test.expect(6);
      var call_order = [];
      async.waterfall([
          function(callback){
              call_order.push('fn1');
              setTimeout(function(){callback(null, 'one', 'two');}, 0);
          },
          function(arg1, arg2, callback){
              call_order.push('fn2');
              test.equals(arg1, 'one');
              test.equals(arg2, 'two');
              setTimeout(function(){callback(null, arg1, arg2, 'three');}, 25);
          },
          function(arg1, arg2, arg3, callback){
              call_order.push('fn3');
              test.equals(arg1, 'one');
              test.equals(arg2, 'two');
              test.equals(arg3, 'three');
              callback(null, 'four');
          },
          function(arg4, callback){
              call_order.push('fn4');
              test.same(call_order, ['fn1','fn2','fn3','fn4']);
              callback(null, 'test');
          }
      ], function(err){
          test.done();
      });
  };
  
  exports['waterfall empty array'] = function(test){
      async.waterfall([], function(err){
          test.done();
      });
  };
  
  exports['waterfall no callback'] = function(test){
      async.waterfall([
          function(callback){callback();},
          function(callback){callback(); test.done();}
      ]);
  };
  
  exports['waterfall async'] = function(test){
      var call_order = [];
      async.waterfall([
          function(callback){
              call_order.push(1);
              callback();
              call_order.push(2);
          },
          function(callback){
              call_order.push(3);
              callback();
          },
          function(){
              test.same(call_order, [1,2,3]);
              test.done();
          }
      ]);
  };
  
  exports['waterfall error'] = function(test){
      test.expect(1);
      async.waterfall([
          function(callback){
              callback('error');
          },
          function(callback){
              test.ok(false, 'next function should not be called');
              callback();
          }
      ], function(err){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['waterfall multiple callback calls'] = function(test){
      var call_order = [];
      var arr = [
          function(callback){
              call_order.push(1);
              // call the callback twice. this should call function 2 twice
              callback(null, 'one', 'two');
              callback(null, 'one', 'two');
          },
          function(arg1, arg2, callback){
              call_order.push(2);
              callback(null, arg1, arg2, 'three');
          },
          function(arg1, arg2, arg3, callback){
              call_order.push(3);
              callback(null, 'four');
          },
          function(arg4){
              call_order.push(4);
              arr[3] = function(){
                  call_order.push(4);
                  test.same(call_order, [1,2,2,3,3,4,4]);
                  test.done();
              };
          }
      ];
      async.waterfall(arr);
  };
  
  
  exports['parallel'] = function(test){
      var call_order = [];
      async.parallel([
          function(callback){
              setTimeout(function(){
                  call_order.push(1);
                  callback(null, 1);
              }, 50);
          },
          function(callback){
              setTimeout(function(){
                  call_order.push(2);
                  callback(null, 2);
              }, 100);
          },
          function(callback){
              setTimeout(function(){
                  call_order.push(3);
                  callback(null, 3,3);
              }, 25);
          }
      ],
      function(err, results){
          test.equals(err, null);
          test.same(call_order, [3,1,2]);
          test.same(results, [1,2,[3,3]]);
          test.done();
      });
  };
  
  exports['parallel empty array'] = function(test){
      async.parallel([], function(err, results){
          test.equals(err, null);
          test.same(results, []);
          test.done();
      });
  };
  
  exports['parallel error'] = function(test){
      async.parallel([
          function(callback){
              callback('error', 1);
          },
          function(callback){
              callback('error2', 2);
          }
      ],
      function(err, results){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 100);
  };
  
  exports['parallel no callback'] = function(test){
      async.parallel([
          function(callback){callback();},
          function(callback){callback(); test.done();},
      ]);
  };
  
  exports['parallel object'] = function(test){
      var call_order = [];
      async.parallel({
          one: function(callback){
              setTimeout(function(){
                  call_order.push(1);
                  callback(null, 1);
              }, 25);
          },
          two: function(callback){
              setTimeout(function(){
                  call_order.push(2);
                  callback(null, 2);
              }, 50);
          },
          three: function(callback){
              setTimeout(function(){
                  call_order.push(3);
                  callback(null, 3,3);
              }, 15);
          }
      },
      function(err, results){
          test.equals(err, null);
          test.same(call_order, [3,1,2]);
          test.same(results, {
              one: 1,
              two: 2,
              three: [3,3]
          });
          test.done();
      });
  };
  
  exports['series'] = function(test){
      var call_order = [];
      async.series([
          function(callback){
              setTimeout(function(){
                  call_order.push(1);
                  callback(null, 1);
              }, 25);
          },
          function(callback){
              setTimeout(function(){
                  call_order.push(2);
                  callback(null, 2);
              }, 50);
          },
          function(callback){
              setTimeout(function(){
                  call_order.push(3);
                  callback(null, 3,3);
              }, 15);
          }
      ],
      function(err, results){
          test.equals(err, null);
          test.same(results, [1,2,[3,3]]);
          test.same(call_order, [1,2,3]);
          test.done();
      });
  };
  
  exports['series empty array'] = function(test){
      async.series([], function(err, results){
          test.equals(err, null);
          test.same(results, []);
          test.done();
      });
  };
  
  exports['series error'] = function(test){
      test.expect(1);
      async.series([
          function(callback){
              callback('error', 1);
          },
          function(callback){
              test.ok(false, 'should not be called');
              callback('error2', 2);
          }
      ],
      function(err, results){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 100);
  };
  
  exports['series no callback'] = function(test){
      async.series([
          function(callback){callback();},
          function(callback){callback(); test.done();},
      ]);
  };
  
  exports['series object'] = function(test){
      var call_order = [];
      async.series({
          one: function(callback){
              setTimeout(function(){
                  call_order.push(1);
                  callback(null, 1);
              }, 25);
          },
          two: function(callback){
              setTimeout(function(){
                  call_order.push(2);
                  callback(null, 2);
              }, 50);
          },
          three: function(callback){
              setTimeout(function(){
                  call_order.push(3);
                  callback(null, 3,3);
              }, 15);
          }
      },
      function(err, results){
          test.equals(err, null);
          test.same(results, {
              one: 1,
              two: 2,
              three: [3,3]
          });
          test.same(call_order, [1,2,3]);
          test.done();
      });
  };
  
  exports['iterator'] = function(test){
      var call_order = [];
      var iterator = async.iterator([
          function(){call_order.push(1);},
          function(arg1){
              test.equals(arg1, 'arg1');
              call_order.push(2);
          },
          function(arg1, arg2){
              test.equals(arg1, 'arg1');
              test.equals(arg2, 'arg2');
              call_order.push(3);
          }
      ]);
      iterator();
      test.same(call_order, [1]);
      var iterator2 = iterator();
      test.same(call_order, [1,1]);
      var iterator3 = iterator2('arg1');
      test.same(call_order, [1,1,2]);
      var iterator4 = iterator3('arg1', 'arg2');
      test.same(call_order, [1,1,2,3]);
      test.equals(iterator4, undefined);
      test.done();
  };
  
  exports['iterator empty array'] = function(test){
      var iterator = async.iterator([]);
      test.equals(iterator(), undefined);
      test.equals(iterator.next(), undefined);
      test.done();
  };
  
  exports['iterator.next'] = function(test){
      var call_order = [];
      var iterator = async.iterator([
          function(){call_order.push(1);},
          function(arg1){
              test.equals(arg1, 'arg1');
              call_order.push(2);
          },
          function(arg1, arg2){
              test.equals(arg1, 'arg1');
              test.equals(arg2, 'arg2');
              call_order.push(3);
          }
      ]);
      var fn = iterator.next();
      var iterator2 = fn('arg1');
      test.same(call_order, [2]);
      iterator2('arg1','arg2');
      test.same(call_order, [2,3]);
      test.equals(iterator2.next(), undefined);
      test.done();
  };
  
  exports['forEach'] = function(test){
      var args = [];
      async.forEach([1,3,2], function(x, callback){
          setTimeout(function(){
              args.push(x);
              callback();
          }, x*25);
      }, function(err){
          test.same(args, [1,2,3]);
          test.done();
      });
  };
  
  exports['forEach empty array'] = function(test){
      test.expect(1);
      async.forEach([], function(x, callback){
          test.ok(false, 'iterator should not be called');
          callback();
      }, function(err){
          test.ok(true, 'should call callback');
      });
      setTimeout(test.done, 25);
  };
  
  exports['forEach error'] = function(test){
      test.expect(1);
      async.forEach([1,2,3], function(x, callback){
          callback('error');
      }, function(err){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['forEachSeries'] = function(test){
      var args = [];
      async.forEachSeries([1,3,2], function(x, callback){
          setTimeout(function(){
              args.push(x);
              callback();
          }, x*25);
      }, function(err){
          test.same(args, [1,3,2]);
          test.done();
      });
  };
  
  exports['forEachSeries empty array'] = function(test){
      test.expect(1);
      async.forEachSeries([], function(x, callback){
          test.ok(false, 'iterator should not be called');
          callback();
      }, function(err){
          test.ok(true, 'should call callback');
      });
      setTimeout(test.done, 25);
  };
  
  exports['forEachSeries error'] = function(test){
      test.expect(2);
      var call_order = [];
      async.forEachSeries([1,2,3], function(x, callback){
          call_order.push(x);
          callback('error');
      }, function(err){
          test.same(call_order, [1]);
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['forEachLimit'] = function(test){
      var args = [];
      var arr = [0,1,2,3,4,5,6,7,8,9];
      async.forEachLimit(arr, 2, function(x,callback){
          setTimeout(function(){
              args.push(x);
              callback();
          }, x*5);
      }, function(err){
          test.same(args, arr);
          test.done();
      });
  };
  
  exports['forEachLimit empty array'] = function(test){
      test.expect(1);
      async.forEachLimit([], 2, function(x, callback){
          test.ok(false, 'iterator should not be called');
          callback();
      }, function(err){
          test.ok(true, 'should call callback');
      });
      setTimeout(test.done, 25);
  };
  
  exports['forEachLimit limit exceeds size'] = function(test){
      var args = [];
      var arr = [0,1,2,3,4,5,6,7,8,9];
      async.forEachLimit(arr, 20, function(x,callback){
          setTimeout(function(){
              args.push(x);
              callback();
          }, x*5);
      }, function(err){
          test.same(args, arr);
          test.done();
      });
  };
  
  exports['forEachLimit limit equal size'] = function(test){
      var args = [];
      var arr = [0,1,2,3,4,5,6,7,8,9];
      async.forEachLimit(arr, 10, function(x,callback){
          setTimeout(function(){
              args.push(x);
              callback();
          }, x*5);
      }, function(err){
          test.same(args, arr);
          test.done();
      });
  };
  
  exports['forEachLimit zero limit'] = function(test){
      test.expect(1);
      async.forEachLimit([0,1,2,3,4,5], 0, function(x, callback){
          test.ok(false, 'iterator should not be called');
          callback();
      }, function(err){
          test.ok(true, 'should call callback');
      });
      setTimeout(test.done, 25);
  };
  
  exports['forEachLimit error'] = function(test){
      test.expect(2);
      var arr = [0,1,2,3,4,5,6,7,8,9];
      var call_order = [];
      
      async.forEachLimit(arr, 3, function(x, callback){
          call_order.push(x);
          if (x === 2) {
              callback('error');
          }
      }, function(err){
          test.same(call_order, [0,1,2]);
          test.equals(err, 'error');
      });
      setTimeout(test.done, 25);
  };
  
  exports['map'] = function(test){
      var call_order = [];
      async.map([1,3,2], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(null, x*2);
          }, x*25);
      }, function(err, results){
          test.same(call_order, [1,2,3]);
          test.same(results, [2,6,4]);
          test.done();
      });
  };
  
  exports['map original untouched'] = function(test){
      var a = [1,2,3];
      async.map(a, function(x, callback){
          callback(null, x*2);
      }, function(err, results){
          test.same(results, [2,4,6]);
          test.same(a, [1,2,3]);
          test.done();
      });
  };
  
  exports['map error'] = function(test){
      test.expect(1);
      async.map([1,2,3], function(x, callback){
          callback('error');
      }, function(err, results){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['mapSeries'] = function(test){
      var call_order = [];
      async.mapSeries([1,3,2], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(null, x*2);
          }, x*25);
      }, function(err, results){
          test.same(call_order, [1,3,2]);
          test.same(results, [2,6,4]);
          test.done();
      });
  };
  
  exports['mapSeries error'] = function(test){
      test.expect(1);
      async.mapSeries([1,2,3], function(x, callback){
          callback('error');
      }, function(err, results){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['reduce'] = function(test){
      var call_order = [];
      async.reduce([1,2,3], 0, function(a, x, callback){
          call_order.push(x);
          callback(null, a + x);
      }, function(err, result){
          test.equals(result, 6);
          test.same(call_order, [1,2,3]);
          test.done();
      });
  };
  
  exports['reduce async with non-reference memo'] = function(test){
      async.reduce([1,3,2], 0, function(a, x, callback){
          setTimeout(function(){callback(null, a + x)}, Math.random()*100);
      }, function(err, result){
          test.equals(result, 6);
          test.done();
      });
  };
  
  exports['reduce error'] = function(test){
      test.expect(1);
      async.reduce([1,2,3], 0, function(a, x, callback){
          callback('error');
      }, function(err, result){
          test.equals(err, 'error');
      });
      setTimeout(test.done, 50);
  };
  
  exports['inject alias'] = function(test){
      test.equals(async.inject, async.reduce);
      test.done();
  };
  
  exports['foldl alias'] = function(test){
      test.equals(async.foldl, async.reduce);
      test.done();
  };
  
  exports['reduceRight'] = function(test){
      var call_order = [];
      var a = [1,2,3];
      async.reduceRight(a, 0, function(a, x, callback){
          call_order.push(x);
          callback(null, a + x);
      }, function(err, result){
          test.equals(result, 6);
          test.same(call_order, [3,2,1]);
          test.same(a, [1,2,3]);
          test.done();
      });
  };
  
  exports['foldr alias'] = function(test){
      test.equals(async.foldr, async.reduceRight);
      test.done();
  };
  
  exports['filter'] = function(test){
      async.filter([3,1,2], function(x, callback){
          setTimeout(function(){callback(x % 2);}, x*25);
      }, function(results){
          test.same(results, [3,1]);
          test.done();
      });
  };
  
  exports['filter original untouched'] = function(test){
      var a = [3,1,2];
      async.filter(a, function(x, callback){
          callback(x % 2);
      }, function(results){
          test.same(results, [3,1]);
          test.same(a, [3,1,2]);
          test.done();
      });
  };
  
  exports['filterSeries'] = function(test){
      async.filterSeries([3,1,2], function(x, callback){
          setTimeout(function(){callback(x % 2);}, x*25);
      }, function(results){
          test.same(results, [3,1]);
          test.done();
      });
  };
  
  exports['select alias'] = function(test){
      test.equals(async.select, async.filter);
      test.done();
  };
  
  exports['selectSeries alias'] = function(test){
      test.equals(async.selectSeries, async.filterSeries);
      test.done();
  };
  
  exports['reject'] = function(test){
      async.reject([3,1,2], function(x, callback){
          setTimeout(function(){callback(x % 2);}, x*25);
      }, function(results){
          test.same(results, [2]);
          test.done();
      });
  };
  
  exports['reject original untouched'] = function(test){
      var a = [3,1,2];
      async.reject(a, function(x, callback){
          callback(x % 2);
      }, function(results){
          test.same(results, [2]);
          test.same(a, [3,1,2]);
          test.done();
      });
  };
  
  exports['rejectSeries'] = function(test){
      async.rejectSeries([3,1,2], function(x, callback){
          setTimeout(function(){callback(x % 2);}, x*25);
      }, function(results){
          test.same(results, [2]);
          test.done();
      });
  };
  
  exports['some true'] = function(test){
      async.some([3,1,2], function(x, callback){
          setTimeout(function(){callback(x === 1);}, 0);
      }, function(result){
          test.equals(result, true);
          test.done();
      });
  };
  
  exports['some false'] = function(test){
      async.some([3,1,2], function(x, callback){
          setTimeout(function(){callback(x === 10);}, 0);
      }, function(result){
          test.equals(result, false);
          test.done();
      });
  };
  
  exports['some early return'] = function(test){
      var call_order = [];
      async.some([1,2,3], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x === 1);
          }, x*25);
      }, function(result){
          call_order.push('callback');
      });
      setTimeout(function(){
          test.same(call_order, [1,'callback',2,3]);
          test.done();
      }, 100);
  };
  
  exports['any alias'] = function(test){
      test.equals(async.any, async.some);
      test.done();
  };
  
  exports['every true'] = function(test){
      async.every([1,2,3], function(x, callback){
          setTimeout(function(){callback(true);}, 0);
      }, function(result){
          test.equals(result, true);
          test.done();
      });
  };
  
  exports['every false'] = function(test){
      async.every([1,2,3], function(x, callback){
          setTimeout(function(){callback(x % 2);}, 0);
      }, function(result){
          test.equals(result, false);
          test.done();
      });
  };
  
  exports['every early return'] = function(test){
      var call_order = [];
      async.every([1,2,3], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x === 1);
          }, x*25);
      }, function(result){
          call_order.push('callback');
      });
      setTimeout(function(){
          test.same(call_order, [1,2,'callback',3]);
          test.done();
      }, 100);
  };
  
  exports['all alias'] = function(test){
      test.equals(async.all, async.every);
      test.done();
  };
  
  exports['detect'] = function(test){
      var call_order = [];
      async.detect([3,2,1], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x == 2);
          }, x*25);
      }, function(result){
          call_order.push('callback');
          test.equals(result, 2);
      });
      setTimeout(function(){
          test.same(call_order, [1,2,'callback',3]);
          test.done();
      }, 100);
  };
  
  exports['detect - mulitple matches'] = function(test){
      var call_order = [];
      async.detect([3,2,2,1,2], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x == 2);
          }, x*25);
      }, function(result){
          call_order.push('callback');
          test.equals(result, 2);
      });
      setTimeout(function(){
          test.same(call_order, [1,2,'callback',2,2,3]);
          test.done();
      }, 100);
  };
  
  exports['detectSeries'] = function(test){
      var call_order = [];
      async.detectSeries([3,2,1], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x == 2);
          }, x*25);
      }, function(result){
          call_order.push('callback');
          test.equals(result, 2);
      });
      setTimeout(function(){
          test.same(call_order, [3,2,'callback']);
          test.done();
      }, 200);
  };
  
  exports['detectSeries - multiple matches'] = function(test){
      var call_order = [];
      async.detectSeries([3,2,2,1,2], function(x, callback){
          setTimeout(function(){
              call_order.push(x);
              callback(x == 2);
          }, x*25);
      }, function(result){
          call_order.push('callback');
          test.equals(result, 2);
      });
      setTimeout(function(){
          test.same(call_order, [3,2,'callback']);
          test.done();
      }, 200);
  };
  
  exports['sortBy'] = function(test){
      async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
          setTimeout(function(){callback(null, x.a);}, 0);
      }, function(err, result){
          test.same(result, [{a:1},{a:6},{a:15}]);
          test.done();
      });
  };
  
  exports['apply'] = function(test){
      test.expect(6);
      var fn = function(){
          test.same(Array.prototype.slice.call(arguments), [1,2,3,4])
      };
      async.apply(fn, 1, 2, 3, 4)();
      async.apply(fn, 1, 2, 3)(4);
      async.apply(fn, 1, 2)(3, 4);
      async.apply(fn, 1)(2, 3, 4);
      async.apply(fn)(1, 2, 3, 4);
      test.equals(
          async.apply(function(name){return 'hello ' + name}, 'world')(),
          'hello world'
      );
      test.done();
  };
  
  
  // generates tests for console functions such as async.log
  var console_fn_tests = function(name){
  
      if (typeof console !== 'undefined') {
          exports[name] = function(test){
              test.expect(5);
              var fn = function(arg1, callback){
                  test.equals(arg1, 'one');
                  setTimeout(function(){callback(null, 'test');}, 0);
              };
              var fn_err = function(arg1, callback){
                  test.equals(arg1, 'one');
                  setTimeout(function(){callback('error');}, 0);
              };
              var _console_fn = console[name];
              var _error = console.error;
              console[name] = function(val){
                  test.equals(val, 'test');
                  test.equals(arguments.length, 1);
                  console.error = function(val){
                      test.equals(val, 'error');
                      console[name] = _console_fn;
                      console.error = _error;
                      test.done();
                  };
                  async[name](fn_err, 'one');
              };
              async[name](fn, 'one');
          };
  
          exports[name + ' with multiple result params'] = function(test){
              var fn = function(callback){callback(null,'one','two','three');};
              var _console_fn = console[name];
              var called_with = [];
              console[name] = function(x){
                  called_with.push(x);
              };
              async[name](fn);
              test.same(called_with, ['one','two','three']);
              console[name] = _console_fn;
              test.done();
          };
      }
  
      // browser-only test
      exports[name + ' without console.' + name] = function(test){
          if (typeof window !== 'undefined') {
              var _console = window.console;
              window.console = undefined;
              var fn = function(callback){callback(null, 'val');};
              var fn_err = function(callback){callback('error');};
              async[name](fn);
              async[name](fn_err);
              window.console = _console;
          }
          test.done();
      };
  
  };
  
  console_fn_tests('log');
  console_fn_tests('dir');
  /*console_fn_tests('info');
  console_fn_tests('warn');
  console_fn_tests('error');*/
  
  exports['nextTick'] = function(test){
      var call_order = [];
      async.nextTick(function(){call_order.push('two');});
      call_order.push('one');
      setTimeout(function(){
          test.same(call_order, ['one','two']);
          test.done();
      }, 50);
  };
  
  exports['nextTick in the browser'] = function(test){
      if (typeof process !== 'undefined') {
          // skip this test in node
          return test.done();
      }
      test.expect(1);
  
      var call_order = [];
      async.nextTick(function(){call_order.push('two');});
  
      call_order.push('one');
      setTimeout(function(){
          if (typeof process !== 'undefined') {
              process.nextTick = _nextTick;
          }
          test.same(call_order, ['one','two']);
      }, 50);
      setTimeout(test.done, 100);
  };
  
  exports['noConflict - node only'] = function(test){
      if (typeof process !== 'undefined') {
          // node only test
          test.expect(3);
          var fs = require('fs');
          var filename = __dirname + '/../lib/async.js';
          fs.readFile(filename, function(err, content){
              if(err) return test.done();
              var Script = require('vm').Script;
  
              var s = new Script(content, filename);
              var s2 = new Script(
                  content + 'this.async2 = this.async.noConflict();',
                  filename
              );
  
              var sandbox1 = {async: 'oldvalue'};
              s.runInNewContext(sandbox1);
              test.ok(sandbox1.async);
  
              var sandbox2 = {async: 'oldvalue'};
              s2.runInNewContext(sandbox2);
              test.equals(sandbox2.async, 'oldvalue');
              test.ok(sandbox2.async2);
  
              test.done();
          });
      }
      else test.done();
  };
  
  exports['concat'] = function(test){
      var call_order = [];
      var iterator = function (x, cb) {
          setTimeout(function(){
              call_order.push(x);
              var r = [];
              while (x > 0) {
                  r.push(x);
                  x--;
              }
              cb(null, r);
          }, x*25);
      };
      async.concat([1,3,2], iterator, function(err, results){
          test.same(results, [1,2,1,3,2,1]);
          test.same(call_order, [1,2,3]);
          test.ok(!err);
          test.done();
      });
  };
  
  exports['concat error'] = function(test){
      var iterator = function (x, cb) {
          cb(new Error('test error'));
      };
      async.concat([1,2,3], iterator, function(err, results){
          test.ok(err);
          test.done();
      });
  };
  
  exports['concatSeries'] = function(test){
      var call_order = [];
      var iterator = function (x, cb) {
          setTimeout(function(){
              call_order.push(x);
              var r = [];
              while (x > 0) {
                  r.push(x);
                  x--;
              }
              cb(null, r);
          }, x*25);
      };
      async.concatSeries([1,3,2], iterator, function(err, results){
          test.same(results, [1,3,2,1,2,1]);
          test.same(call_order, [1,3,2]);
          test.ok(!err);
          test.done();
      });
  };
  
  exports['until'] = function (test) {
      var call_order = [];
  
      var count = 0;
      async.until(
          function () {
              call_order.push(['test', count]);
              return (count == 5);
          },
          function (cb) {
              call_order.push(['iterator', count]);
              count++;
              cb();
          },
          function (err) {
              test.same(call_order, [
                  ['test', 0],
                  ['iterator', 0], ['test', 1],
                  ['iterator', 1], ['test', 2],
                  ['iterator', 2], ['test', 3],
                  ['iterator', 3], ['test', 4],
                  ['iterator', 4], ['test', 5],
              ]);
              test.equals(count, 5);
              test.done();
          }
      );
  };
  
  exports['whilst'] = function (test) {
      var call_order = [];
  
      var count = 0;
      async.whilst(
          function () {
              call_order.push(['test', count]);
              return (count < 5);
          },
          function (cb) {
              call_order.push(['iterator', count]);
              count++;
              cb();
          },
          function (err) {
              test.same(call_order, [
                  ['test', 0],
                  ['iterator', 0], ['test', 1],
                  ['iterator', 1], ['test', 2],
                  ['iterator', 2], ['test', 3],
                  ['iterator', 3], ['test', 4],
                  ['iterator', 4], ['test', 5],
              ]);
              test.equals(count, 5);
              test.done();
          }
      );
  };
  
  exports['queue'] = function (test) {
      var call_order = [],
          delays = [40,20,60,20];
  
      // worker1: --1-4
      // worker2: -2---3
      // order of completion: 2,1,4,3
  
      var q = async.queue(function (task, callback) {
          setTimeout(function () {
              call_order.push('process ' + task);
              callback('error', 'arg');
          }, delays.splice(0,1)[0]);
      }, 2);
  
      q.push(1, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 1);
          call_order.push('callback ' + 1);
      });
      q.push(2, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 2);
          call_order.push('callback ' + 2);
      });
      q.push(3, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 0);
          call_order.push('callback ' + 3);
      });
      q.push(4, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 0);
          call_order.push('callback ' + 4);
      });
      test.equal(q.length(), 4);
      test.equal(q.concurrency, 2);
  
      setTimeout(function () {
          test.same(call_order, [
              'process 2', 'callback 2',
              'process 1', 'callback 1',
              'process 4', 'callback 4',
              'process 3', 'callback 3'
          ]);
          test.equal(q.concurrency, 2);
          test.equal(q.length(), 0);
          test.done();
      }, 200);
  };
  
  exports['queue changing concurrency'] = function (test) {
      var call_order = [],
          delays = [40,20,60,20];
  
      // worker1: --1-2---3-4
      // order of completion: 1,2,3,4
  
      var q = async.queue(function (task, callback) {
          setTimeout(function () {
              call_order.push('process ' + task);
              callback('error', 'arg');
          }, delays.splice(0,1)[0]);
      }, 2);
  
      q.push(1, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 3);
          call_order.push('callback ' + 1);
      });
      q.push(2, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 2);
          call_order.push('callback ' + 2);
      });
      q.push(3, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 1);
          call_order.push('callback ' + 3);
      });
      q.push(4, function (err, arg) {
          test.equal(err, 'error');
          test.equal(arg, 'arg');
          test.equal(q.length(), 0);
          call_order.push('callback ' + 4);
      });
      test.equal(q.length(), 4);
      test.equal(q.concurrency, 2);
      q.concurrency = 1;
  
      setTimeout(function () {
          test.same(call_order, [
              'process 1', 'callback 1',
              'process 2', 'callback 2',
              'process 3', 'callback 3',
              'process 4', 'callback 4'
          ]);
          test.equal(q.concurrency, 1);
          test.equal(q.length(), 0);
          test.done();
      }, 250);
  };
  
  exports['queue push without callback'] = function (test) {
      var call_order = [],
          delays = [40,20,60,20];
  
      // worker1: --1-4
      // worker2: -2---3
      // order of completion: 2,1,4,3
  
      var q = async.queue(function (task, callback) {
          setTimeout(function () {
              call_order.push('process ' + task);
              callback('error', 'arg');
          }, delays.splice(0,1)[0]);
      }, 2);
  
      q.push(1);
      q.push(2);
      q.push(3);
      q.push(4);
  
      setTimeout(function () {
          test.same(call_order, [
              'process 2',
              'process 1',
              'process 4',
              'process 3'
          ]);
          test.done();
      }, 200);
  };
  
  exports['memoize'] = function (test) {
      test.expect(4);
      var call_order = [];
  
      var fn = function (arg1, arg2, callback) {
          call_order.push(['fn', arg1, arg2]);
          callback(null, arg1 + arg2);
      };
  
      var fn2 = async.memoize(fn);
      fn2(1, 2, function (err, result) {
          test.equal(result, 3);
      });
      fn2(1, 2, function (err, result) {
          test.equal(result, 3);
      });
      fn2(2, 2, function (err, result) {
          test.equal(result, 4);
      });
  
      test.same(call_order, [['fn',1,2], ['fn',2,2]]);
      test.done();
  };
  
  exports['unmemoize'] = function(test) {
      test.expect(4);
      var call_order = [];
  
      var fn = function (arg1, arg2, callback) {
          call_order.push(['fn', arg1, arg2]);
          callback(null, arg1 + arg2);
      };
  
      var fn2 = async.memoize(fn);
      var fn3 = async.unmemoize(fn2);
      fn3(1, 2, function (err, result) {
          test.equal(result, 3);
      });
      fn3(1, 2, function (err, result) {
          test.equal(result, 3);
      });
      fn3(2, 2, function (err, result) {
          test.equal(result, 4);
      });
  
      test.same(call_order, [['fn',1,2], ['fn',1,2], ['fn',2,2]]);
  
      test.done();
  }
  
  exports['unmemoize a not memoized function'] = function(test) {
      test.expect(1);
  
      var fn = function (arg1, arg2, callback) {
          callback(null, arg1 + arg2);
      };
  
      var fn2 = async.unmemoize(fn);
      fn2(1, 2, function(err, result) {
          test.equal(result, 3);
      });
  
      test.done();
  }
  
  exports['memoize error'] = function (test) {
      test.expect(1);
      var testerr = new Error('test');
      var fn = function (arg1, arg2, callback) {
          callback(testerr, arg1 + arg2);
      };
      async.memoize(fn)(1, 2, function (err, result) {
          test.equal(err, testerr);
      });
      test.done();
  };
  
  exports['memoize multiple calls'] = function (test) {
      test.expect(3);
      var fn = function (arg1, arg2, callback) {
          test.ok(true);
          setTimeout(function(){
              callback(null, arg1, arg2);
          }, 10);
      };
      var fn2 = async.memoize(fn);
      fn2(1, 2, function(err, result) {
          test.equal(result, 1, 2);
      });
      fn2(1, 2, function(err, result) {
          test.equal(result, 1, 2);
          test.done();
      });
  };
  
  exports['memoize custom hash function'] = function (test) {
      test.expect(2);
      var testerr = new Error('test');
  
      var fn = function (arg1, arg2, callback) {
          callback(testerr, arg1 + arg2);
      };
      var fn2 = async.memoize(fn, function () {
          return 'custom hash';
      });
      fn2(1, 2, function (err, result) {
          test.equal(result, 3);
      });
      fn2(2, 2, function (err, result) {
          test.equal(result, 3);
      });
      test.done();
  };
  
  // Issue 10 on github: https://github.com/caolan/async/issues#issue/10
  exports['falsy return values in series'] = function (test) {
      function taskFalse(callback) {
          async.nextTick(function() {
              callback(null, false);
          });
      };
      function taskUndefined(callback) {
          async.nextTick(function() {
              callback(null, undefined);
          });
      };
      function taskEmpty(callback) {
          async.nextTick(function() {
              callback(null);
          });
      };
      function taskNull(callback) {
          async.nextTick(function() {
              callback(null, null);
          });
      };
      async.series(
          [taskFalse, taskUndefined, taskEmpty, taskNull],
          function(err, results) {
              test.equal(results.length, 4);
              test.strictEqual(results[0], false);
              test.strictEqual(results[1], undefined);
              test.strictEqual(results[2], undefined);
              test.strictEqual(results[3], null);
              test.done();
          }
      );
  };
  
  // Issue 10 on github: https://github.com/caolan/async/issues#issue/10
  exports['falsy return values in parallel'] = function (test) {
      function taskFalse(callback) {
          async.nextTick(function() {
              callback(null, false);
          });
      };
      function taskUndefined(callback) {
          async.nextTick(function() {
              callback(null, undefined);
          });
      };
      function taskEmpty(callback) {
          async.nextTick(function() {
              callback(null);
          });
      };
      function taskNull(callback) {
          async.nextTick(function() {
              callback(null, null);
          });
      };
      async.parallel(
          [taskFalse, taskUndefined, taskEmpty, taskNull],
          function(err, results) {
              test.equal(results.length, 4);
              test.strictEqual(results[0], false);
              test.strictEqual(results[1], undefined);
              test.strictEqual(results[2], undefined);
              test.strictEqual(results[3], null);
              test.done();
          }
      );
  };
  
  exports['queue events'] = function(test) {
      var calls = [];
      var q = async.queue(function(task, cb) {
          // nop
          calls.push('process ' + task);
          cb();
      }, 3);
  
      q.saturated = function() {
          test.ok(q.length() == 3, 'queue should be saturated now');
          calls.push('saturated');
      };
      q.empty = function() {
          test.ok(q.length() == 0, 'queue should be empty now');
          calls.push('empty');
      };
      q.drain = function() {
          test.ok(
              q.length() == 0 && q.running() == 0,
              'queue should be empty now and no more workers should be running'
          );
          calls.push('drain');
          test.same(calls, [
              'saturated',
              'process foo',
              'foo cb',
              'process bar',
              'bar cb',
              'process zoo',
              'zoo cb',
              'process poo',
              'poo cb',
              'empty',
              'process moo',
              'moo cb',
              'drain',
          ]);
          test.done();
      };
      q.push('foo', function () {calls.push('foo cb');});
      q.push('bar', function () {calls.push('bar cb');});
      q.push('zoo', function () {calls.push('zoo cb');});
      q.push('poo', function () {calls.push('poo cb');});
      q.push('moo', function () {calls.push('moo cb');});
  };
  