round up gb numbers

tests/test_partitions.py

@@ -13,7 +13,7 @@ BS = 512
 
 
 def to_gbytes(size_bytes):
-    return size_bytes/(1024*1024*1024)
+    return int(round(size_bytes/(1024*1024*1024)))
 
 def read_file(fname):
     with open(fname, 'r') as f: