diff --git a/test/test_vector.py b/test/test_vector.py
index 7f0896e..aeb002f 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -15,6 +15,6 @@ class TestVector(unittest.TestCase):
         v1 = Vector(0, 0, 0)
         v2 = Vector(1, 2, 2)
         v3 = Vector(1, -2, 2)
-        self.assertEqual(v1.abs, 0)
-        self.assertEqual(v2.abs, 3)
-        self.assertEqual(v2.abs, v3.abs)
\ No newline at end of file
+        self.assertEqual(v1.abs(), 0)
+        self.assertEqual(v2.abs(), 3)
+        self.assertEqual(v2.abs(), v3.abs())
\ No newline at end of file