tests: move common test code to a separate file

Also: fix a few TODOs with the current expressions
Fun fact: the test identified a problem in our implementation of Payload::Transport::build !

1 files changed, 1 insertions, 1 deletions

diff --git a/src/expr/payload.rs b/src/expr/payload.rs
index 7612fd9..4ba47df 100644
--- a/src/expr/payload.rs
+++ b/src/expr/payload.rs
@@ -28,7 +28,7 @@ impl Payload {
             }),
             Payload::Transport(ref f) => RawPayload::Transport(RawPayloadData {
                 offset: f.offset(),
-                len: f.offset(),
+                len: f.len(),
             }),
         }
     }