diff --git a/exp/tests/test_geometry.py b/exp/tests/test_geometry.py
--- a/exp/tests/test_geometry.py
+++ b/exp/tests/test_geometry.py
@@ -2,6 +2,8 @@ import math
 import random
 from unittest import TestCase
 
+import numpy as np
+
 from geometry import Line,EPoint
 
 random.seed(361)
@@ -89,3 +91,15 @@ class TestLine(TestCase):
 		q_=q.shiftBasis(newBasis)
 		self.assertAlmostEqual(q_._alpha,math.pi*7/4)
 		self.assertAlmostEqual(q_._d,3/2*diag)
+
+	def testTransform(self):
+		rot90=np.array([[0,-1,0],[1,0,0],[0,0,1]])
+		p=Line(math.pi/4,10)
+		p_=p.transform(rot90)
+		self.assertAlmostEqual(p_.alpha,math.pi*3/4)
+		self.assertAlmostEqual(p_.d,p.d)
+
+		shiftXY10=np.array([[1,0,10],[0,1,10],[0,0,1]])
+		p_=p.transform(shiftXY10)
+		self.assertAlmostEqual(p_.alpha,p.alpha)
+		self.assertAlmostEqual(p_.d,10+10*math.sqrt(2))