1 files changed, 61 insertions, 0 deletions
diff --git a/python/rsa/tests/test_common.py b/python/rsa/tests/test_common.py
new file mode 100644
index 000000000..d105dc020
--- /dev/null
+++ b/python/rsa/tests/test_common.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import unittest2
+import struct
+from rsa._compat import byte, b
+from rsa.common import byte_size, bit_size, _bit_size
+
+
+class Test_byte(unittest2.TestCase):
+    def test_values(self):
+        self.assertEqual(byte(0), b('\x00'))
+        self.assertEqual(byte(255), b('\xff'))
+
+    def test_struct_error_when_out_of_bounds(self):
+        self.assertRaises(struct.error, byte, 256)
+        self.assertRaises(struct.error, byte, -1)
+
+class Test_byte_size(unittest2.TestCase):
+    def test_values(self):
+        self.assertEqual(byte_size(1 << 1023), 128)
+        self.assertEqual(byte_size((1 << 1024) - 1), 128)
+        self.assertEqual(byte_size(1 << 1024), 129)
+        self.assertEqual(byte_size(255), 1)
+        self.assertEqual(byte_size(256), 2)
+        self.assertEqual(byte_size(0xffff), 2)
+        self.assertEqual(byte_size(0xffffff), 3)
+        self.assertEqual(byte_size(0xffffffff), 4)
+        self.assertEqual(byte_size(0xffffffffff), 5)
+        self.assertEqual(byte_size(0xffffffffffff), 6)
+        self.assertEqual(byte_size(0xffffffffffffff), 7)
+        self.assertEqual(byte_size(0xffffffffffffffff), 8)
+
+    def test_zero(self):
+        self.assertEqual(byte_size(0), 1)
+
+    def test_bad_type(self):
+        self.assertRaises(TypeError, byte_size, [])
+        self.assertRaises(TypeError, byte_size, ())
+        self.assertRaises(TypeError, byte_size, dict())
+        self.assertRaises(TypeError, byte_size, "")
+        self.assertRaises(TypeError, byte_size, None)
+
+class Test_bit_size(unittest2.TestCase):
+    def test_zero(self):
+        self.assertEqual(bit_size(0), 0)
+
+    def test_values(self):
+        self.assertEqual(bit_size(1023), 10)
+        self.assertEqual(bit_size(1024), 11)
+        self.assertEqual(bit_size(1025), 11)
+        self.assertEqual(bit_size(1 << 1024), 1025)
+        self.assertEqual(bit_size((1 << 1024) + 1), 1025)
+        self.assertEqual(bit_size((1 << 1024) - 1), 1024)
+
+        self.assertEqual(_bit_size(1023), 10)
+        self.assertEqual(_bit_size(1024), 11)
+        self.assertEqual(_bit_size(1025), 11)
+        self.assertEqual(_bit_size(1 << 1024), 1025)
+        self.assertEqual(_bit_size((1 << 1024) + 1), 1025)
+        self.assertEqual(_bit_size((1 << 1024) - 1), 1024)