diff --git a/test/test_vector.py b/test/test_vector.py
index 3606b6d..53938f9 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -32,3 +32,16 @@ class TestVector(unittest.TestCase):
         v3 = v1 + v2
         self.assertIsInstance(v3, Vector)
         self.assertEqual(v3.x, v1.x + v2.x)
+        
+    def test_dot_failure(self):
+        with self.assertRaises(ValueError):
+            v1 = Vector(1, 2, 3)
+            v1.dot(3)
+
+    def test_dot_product(self):
+        v1 = Vector(1, 2, 3)
+        v2 = Vector(-3, -2, -1)
+        v3 = v1.dot(v2)
+        self.assertEqual(v3,v1.x * v2.x + v1.y * v2.y + v1.z * v2.z)
+        vzero = Vector(0, 0, 0)
+        self.assertEqual(v1.dot(vzero),0)