diff --git a/src/shamira/tests/test_gf256.py b/src/shamira/tests/test_gf256.py
--- a/src/shamira/tests/test_gf256.py
+++ b/src/shamira/tests/test_gf256.py
@@ -26,8 +26,8 @@ class TestGF256(TestCase):
 		for x in range(256):
 			(a0, a1, a2, a3) = (x, x>>1, x>>2, x>>3)
 			self.assertEqual(evaluate([17], x), 17)  # constant polynomial
-			self.assertEqual(evaluate([a0, a1, a2, a3], 0), x)  # any polynomial at 0
-			self.assertEqual(evaluate([a0, a1, a2, a3], 1), a0^a1^a2^a3)  # polynomial at 1 == sum of coefficients
+			self.assertEqual(evaluate([a3, a2, a1, a0], 0), x)  # any polynomial at 0
+			self.assertEqual(evaluate([a3, a2, a1, a0], 1), a0^a1^a2^a3)  # polynomial at 1 == sum of coefficients
 
 	def test_get_constant_coef(self):
 		weights = compute_weights((1, 2, 3))
@@ -60,7 +60,7 @@ class TestGF256(TestCase):
 
 		(xs, ys) = zip(*points[:m])
 		weights = compute_weights(xs)
-		return (get_constant_coef(weights, ys), coefs[0])
+		return (get_constant_coef(weights, ys), coefs[-1])
 
 
 if __name__=='__main__':