1 files changed, 70 insertions, 0 deletions
diff --git a/mocha_test/race.js b/mocha_test/race.js
new file mode 100644
index 0000000..d56205d
--- /dev/null
+++ b/mocha_test/race.js
@@ -0,0 +1,70 @@
+var async = require('../lib');
+var assert = require('assert');
+
+describe('race', function () {
+    it('should call each function in parallel and callback with first result', function raceTest10(done) {
+        var finished = 0;
+        var tasks = [];
+        function eachTest(i) {
+            var index = i;
+            return function (next) {
+                finished++;
+                next(null, index);
+            };
+        }
+        for (var i = 0; i < 10; i++) {
+            tasks[i] = eachTest(i);
+        }
+        async.race(tasks, function (err, result) {
+            assert.ifError(err);
+            //0 finished first
+            assert.strictEqual(result, 0);
+            assert.strictEqual(finished, 1);
+            async.setImmediate(function () {
+                assert.strictEqual(finished, 10);
+                done();
+            });
+        });
+    });
+    it('should callback with the first error', function raceTest20(done) {
+        var tasks = [];
+        function eachTest(i) {
+            var index = i;
+            return function (next) {
+                setTimeout(function () {
+                    next(new Error('ERR' + index));
+                }, 50 - index * 2);
+            };
+        }
+        for (var i = 0; i <= 5; i++) {
+            tasks[i] = eachTest(i);
+        }
+        async.race(tasks, function (err, result) {
+            assert.ok(err);
+            assert.ok(err instanceof Error);
+            assert.strictEqual(typeof result, 'undefined');
+            assert.strictEqual(err.message, 'ERR5');
+            done();
+        });
+    });
+    it('should callback when task is empty', function raceTest30(done) {
+        async.race([], function (err, result) {
+            assert.ifError(err);
+            assert.strictEqual(typeof result, 'undefined');
+            done();
+        });
+    });
+    it('should callback in error the task arg is not an Array', function raceTest40() {
+        var errors = [];
+        async.race(null, function (err) {
+            errors.push(err);
+        });
+        async.race({}, function (err) {
+            errors.push(err);
+        });
+        assert.strictEqual(errors.length, 2);
+        assert.ok(errors[0] instanceof TypeError);
+        assert.ok(errors[1] instanceof TypeError);
+    });
+});
+