Vroom seems to get confused and report old messages as the "received" message in "Expected message not received" errors.

For instance, given a vroom file like

   :echomsg 'Foo'
   ~ Foo

   :
   ~ Bar

Vroom will fail with the error

 FAILED on line 4: Expected message not received:
 "Bar" (verbatim mode)
 Message was "Foo"

Instead, it should say

 FAILED on line 4: Expected message not received:
 "Bar" (verbatim mode)
 There were no messages.

Note this doesn't seem to have any affect on vroom's checks themselves. Even though it says it received "Foo", an expectation for "Foo" will still fail.