diff -r 0a8509023c09 Lib/test/test_turtle.py
--- a/Lib/test/test_turtle.py	Sun Jun 05 01:38:29 2016 +0200
+++ b/Lib/test/test_turtle.py	Sat Jun 04 16:55:47 2016 -0700
@@ -1,3 +1,4 @@
+import pickle
 import unittest
 from test import support
 
@@ -129,6 +130,39 @@
 
 class TestVec2D(VectorComparisonMixin, unittest.TestCase):
 
+    def test_constructor(self):
+        vec = Vec2D(0, 1)
+        self.assertEqual(vec[0], 0)
+        self.assertEqual(vec[1], 1)
+        self.assertIsInstance(vec, Vec2D)
+
+        with self.assertRaises(TypeError):
+            Vec2D()
+
+        with self.assertRaises(TypeError):
+            Vec2D((0, 1))
+
+        with self.assertRaises(TypeError):
+            Vec2D(0, 1, 2)
+
+    def test_repr(self):
+        vec = Vec2D(0, 1)
+        self.assertEqual(repr(vec), '(0.00,1.00)')
+
+    def test_equality(self):
+        vec1 = Vec2D(0, 1)
+        vec2 = Vec2D(0.0, 1)
+        vec3 = Vec2D(42, 1)
+        self.assertEqual(vec1, vec2)
+        self.assertNotEqual(vec1, vec3)
+        self.assertNotEqual(vec2, vec3)
+
+    def test_pickling(self):
+        vec = Vec2D(0, 1)
+        pickled = pickle.dumps(vec)
+        unpickled = pickle.loads(pickled)
+        self.assertEqual(vec, unpickled)
+
     def _assert_arithmetic_cases(self, test_cases, lambda_operator):
         for test_case in test_cases:
             with self.subTest(case=test_case):