1 files changed, 65 insertions, 0 deletions
diff --git a/test/transform.js b/test/transform.js
new file mode 100644
index 0000000..a02b54b
--- /dev/null
+++ b/test/transform.js
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+var async = require('../lib');
+var expect = require('chai').expect;
+
+describe('transform', function() {
+
+    it('transform implictly determines memo if not provided', function(done) {
+        async.transform([1,2,3], function(memo, x, v, callback){
+            memo.push(x + 1);
+            callback();
+        }, function(err, result){
+            expect(result).to.eql([2, 3, 4]);
+            done();
+        });
+    });
+
+    it('transform async with object memo', function(done) {
+        async.transform([1,3,2], {}, function(memo, v, k, callback){
+            setTimeout(function() {
+                memo[k] = v;
+                callback();
+            });
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql({
+                0: 1,
+                1: 3,
+                2: 2
+            });
+            done();
+        });
+    });
+
+    it('transform iterating object', function(done) {
+        async.transform({a: 1, b: 3, c: 2}, function(memo, v, k, callback){
+            setTimeout(function() {
+                memo[k] = v + 1;
+                callback();
+            });
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql({a: 2, b: 4, c: 3});
+            done();
+        });
+    });
+
+    it('transform error', function(done) {
+        async.transform([1,2,3], function(a, v, k, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+            done();
+        });
+    });
+
+    it('transform with two arguments', function(done) {
+        try {
+            async.transform([1, 2, 3], function (a, v, k, callback) {
+                callback();
+            });
+            done();
+        } catch (e) {
+            expect.fail();
+        }
+    });
+});