gcd works with negatives numbers and it is now tested

test/test_arthmetic.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+
+import unittest
+
+from pymath import arithmetic
+
+
+
+class TestArithmetic(unittest.TestCase):
+    """Testing functions from pymath.arithmetic"""
+
+    def test_gcd_commu(self):
+        self.assertEqual(arithmetic.gcd(3, 15), arithmetic.gcd(15,3))
+
+    def test_gcd1(self):
+        self.assertEqual(arithmetic.gcd(3, 15), 3)
+
+    def test_gcd2(self):
+        self.assertEqual(arithmetic.gcd(14, 21), 7)
+
+    def test_gcd_prem(self):
+        self.assertEqual(arithmetic.gcd(14, 19), 1)
+
+    def test_gcd_neg(self):
+        self.assertEqual(arithmetic.gcd(3, -15), 3)
+        self.assertEqual(arithmetic.gcd(-3, -15), -3)
+
+
+if __name__ == '__main__':
+    unittest.main()
+
+
+
+
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del 
+