[vstest]: use BytesIO for file operations

this is another py3 fix Signed-off-by: Guohan Lu <lguohan@gmail.com>
lguohan · Jul 19, 2020 · d2bab10 · d2bab10
1 parent 982c9a3
commit d2bab10
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/tests/conftest.py b/tests/conftest.py
@@ -421,7 +421,7 @@ def runcmd(self, cmd):
         return (exitcode, out)
 
     def copy_file(self, path, filename):
-        tarstr = io.StringIO()
+        tarstr = io.BytesIO()
         tar = tarfile.open(fileobj=tarstr, mode="w")
         tar.add(filename, os.path.basename(filename))
         tar.close()