Merge pull request #602 from sbraz/invalid_escape_sequence

tests: fix "DeprecationWarning: invalid escape sequence"

Author: vassilit

tests/test_options/test_size.py

@@ -64,7 +64,7 @@ def trigger(*args):
             assert False
 
     # Not a valid range:
-    trigger('--size \-\-17')
+    trigger(r'--size --17')
 
     # max < min
     trigger('--size 10-9')