Added start of blocks module (varint impl)
diff --git a/tests/test_blocks.py b/tests/test_blocks.py
new file mode 100644
index 0000000..be7b640
--- /dev/null
+++ b/tests/test_blocks.py
@@ -0,0 +1,58 @@
+'''Tests block operations.'''
+
+from StringIO import StringIO
+import unittest
+
+from rsa import blocks
+
+class VarintTest(unittest.TestCase):
+
+ def test_read_varint(self):
+
+ encoded = '\xac\x02crummy'
+ infile = StringIO(encoded)
+
+ (decoded, read) = blocks.read_varint(infile)
+
+ # Test the returned values
+ self.assertEqual(300, decoded)
+ self.assertEqual(2, read)
+
+ # The rest of the file should be untouched
+ self.assertEqual('crummy', infile.read())
+
+ def test_read_zero(self):
+
+ encoded = '\x00crummy'
+ infile = StringIO(encoded)
+
+ (decoded, read) = blocks.read_varint(infile)
+
+ # Test the returned values
+ self.assertEqual(0, decoded)
+ self.assertEqual(1, read)
+
+ # The rest of the file should be untouched
+ self.assertEqual('crummy', infile.read())
+
+ def test_write_varint(self):
+
+ expected = '\xac\x02'
+ outfile = StringIO()
+
+ written = blocks.write_varint(outfile, 300)
+
+ # Test the returned values
+ self.assertEqual(expected, outfile.getvalue())
+ self.assertEqual(2, written)
+
+
+ def test_write_zero(self):
+
+ outfile = StringIO()
+ written = blocks.write_varint(outfile, 0)
+
+ # Test the returned values
+ self.assertEqual('\x00', outfile.getvalue())
+ self.assertEqual(1, written)
+