Thunderbird 25 compatibility tests (bug 1019813)
Thunderbird 26 compatibility tests (bug 1019815)
Thunderbird 27 compatibility tests (bug 1019817)
Thunderbird 28 compatibility tests (bug 1019818)
Thunderbird 29 compatibility tests (bug 1019819)
Thunderbird 30 compatibility tests (bug 1019820)
Make sure compat helper fails if passing no method