Fixing bug with appending varint of 0.

lib/cql/protocol/cql_byte_buffer.rb

@@ -251,6 +251,9 @@ def append_long(n)
       def append_varint(n)
         num = n
         bytes = []
+
+        bytes << 0 if num == 0
+
         until num == 0
           bytes << (num & 0xff)
           num = num >> 8
@@ -282,4 +285,4 @@ def append_float(n)
       DECIMAL_POINT = '.'.freeze
     end
   end
-end
+end

spec/cql/protocol/cql_byte_buffer_spec.rb

@@ -810,6 +810,11 @@ module Protocol
       end
 
       describe '#append_varint' do
+        it 'encodes zero' do
+          buffer.append_varint(0)
+          buffer.should eql_bytes("\x00")
+        end
+
         it 'encodes a variable length integer' do
           buffer.append_varint(1231312312331283012830129382342342412123)
           buffer.should eql_bytes("\x03\x9EV \x15\f\x03\x9DK\x18\xCDI\\$?\a[")
@@ -892,4 +897,4 @@ module Protocol
       end
     end
   end
-end
+end