1 files changed, 12 insertions, 2 deletions
diff --git a/gbp/git.py b/gbp/git.py
index 2fc29c9b..014403e9 100644
--- a/gbp/git.py
+++ b/gbp/git.py
@@ -206,12 +206,22 @@ def create_repo(path):
 
 
 def build_tag(format, version):
-    """Generate a tag from a given format and a version"""
+    """Generate a tag from a given format and a version
+    >>> build_tag("debian/%(version)s", "0:0~0")
+    'debian/0.0'
+    """
     return format % dict(version=__sanitize_version(version))
 
 
 def __sanitize_version(version):
-    """sanitize a version so git accepts it as a tag"""
+    """sanitize a version so git accepts it as a tag
+    >>> __sanitize_version("0.0.0")
+    '0.0.0'
+    >>> __sanitize_version("0.0~0")
+    '0.0.0'
+    >>> __sanitize_version("0:0.0")
+    '0.0'
+    """
     if ':' in version: # strip of any epochs
         version = version.split(':', 1)[1]
     return version.replace('~', '.')