diff --git a/FourmiCrawler/pipelines.py b/FourmiCrawler/pipelines.py
index 2dfd531..1bcba3a 100644
--- a/FourmiCrawler/pipelines.py
+++ b/FourmiCrawler/pipelines.py
@@ -35,7 +35,7 @@ class DuplicatePipeline(object):
         """
         value = (item['attribute'], item['value'], item['conditions'])
         if value in self.known_values:
-            raise DropItem("Duplicate item found: %s" % item) # #[todo] append sources of first item.
+            raise DropItem("Duplicate item found: %s" % item) #[todo] append sources of first item.
         else:
             self.known_values.add(value)
             return item
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
new file mode 100644
index 0000000..9500272
--- /dev/null
+++ b/tests/test_pipeline.py
@@ -0,0 +1,48 @@
+import copy
+import unittest
+from FourmiCrawler import pipelines, spider, items
+from scrapy.exceptions import DropItem
+
+
+class TestPipelines(unittest.TestCase):
+
+    def setUp(self):
+        self.testItem = items.Result()
+
+    def test_NonePipeline(self):
+        self.testItem["value"] = "abc"
+        pipe = pipelines.RemoveNonePipeline()
+        processed = pipe.process_item(self.testItem, spider.FourmiSpider())
+
+        self.assertTrue(processed["value"] == "abc")
+
+        for key in self.testItem:
+            self.assertIsNotNone(processed[key])
+            if key is not "value":
+                self.assertIs(processed[key], "")
+
+    def test_DuplicatePipeline(self):
+        self.testItem["attribute"] = "test"
+        self.testItem["value"] = "test"
+        self.testItem["conditions"] = "test"
+
+        pipe = pipelines.DuplicatePipeline()
+        self.assertEqual(pipe.process_item(self.testItem, spider.FourmiSpider()), self.testItem)
+        self.assertRaises(DropItem, pipe.process_item, self.testItem, spider.FourmiSpider())
+
+        otherItem = copy.deepcopy(self.testItem)
+        otherItem["value"] = "test1"
+        self.assertEqual(pipe.process_item(otherItem, spider.FourmiSpider()), otherItem)
+
+    def test_AttributeSelection(self):
+        item1 = copy.deepcopy(self.testItem)
+        item2 = copy.deepcopy(self.testItem)
+
+        item1["attribute"] = "abd"
+        item2["attribute"] = "abc"
+
+        s = spider.FourmiSpider(selected_attributes=["a.d"])
+        pipe = pipelines.AttributeSelectionPipeline()
+
+        self.assertEqual(pipe.process_item(item1, s), item1)
+        self.assertRaises(DropItem, pipe.process_item, item2, s)
\ No newline at end of file