We largely use the corpus under test/corpus for
testing. Unfortunately, many of our tests have grown to depend on
having exactly this set of messages, making it hard to add new message
files for testing specific cases.
We do use a lot of add_message from within the tests, but it's not
possible to use that for adding broken messages, and adding several
messages at once can get unwieldy.
Move the basic corpus under tests/corpora/default, and make it
possible to add new, independent corpora along its side. This means
tons of renames with a few tweaks to add_email_corpus function in
test-lib.sh to let tests specify which corpus to use.
Update the test mail corpus to have two files with the same content to
expose the bug where a single message with multiple filenames only
reports a single filename.
Update expected results for search --output=files to match new
behavior for multiple files corresponding to a single message
Signed-off-by: Mark Anderson <ma.skies@gmail.com>
