added tests for Link object

scrapy/tests/test_link.py

@@ -0,0 +1,28 @@
+import unittest
+
+from scrapy.link import Link
+
+class LinkTest(unittest.TestCase):
+
+    def test_eq_and_hash(self):
+        l1 = Link("http://www.example.com")
+        l2 = Link("http://www.example.com/other")
+        l3 = Link("http://www.example.com")
+
+        self.assertEqual(l1, l1)
+        self.assertEqual(hash(l1), hash(l1))
+        self.assertNotEqual(l1, l2)
+        self.assertNotEqual(hash(l1), hash(l2))
+        self.assertEqual(l1, l3)
+        self.assertEqual(hash(l1), hash(l3))
+
+        l4 = Link("http://www.example.com", text="test")
+        l5 = Link("http://www.example.com", text="test2")
+        l6 = Link("http://www.example.com", text="test")
+
+        self.assertEqual(l4, l4)
+        self.assertEqual(hash(l4), hash(l4))
+        self.assertNotEqual(l4, l5)
+        self.assertNotEqual(hash(l4), hash(l5))
+        self.assertEqual(l4, l6)
+        self.assertEqual(hash(l4), hash(l6))