The files (test) scripts source (with builtin command `.`) provides
information which the scripts depend, and without the `source` to
succeed allowing script to continue may lead to dangerous situations
(e.g. rm -rf "${undefined_variable}"/*).
At the end of all source (.) lines construct ' || exit 1' was added;
In our case the script script will exit if it cannot find (or read) the
file to be sourced. Additionally script would also exits if the last
command of the sourced file exited nonzero.
We will need this for improved folder search tests, but having some
folders should exercise our code paths better anyway.
Modify the relevant test accordingly to make it pass.
This reorganization triggers a bug in the test suite, namely that it
expects the output of --output=files to be in a certain order. So we
add the fix for that into the same commit.
This mainly involves sorting, although the case --duplicate=$n
requires more subtlety.
Sanitize tabs and newlines to spaces rather than question marks in
--output=summary --format=text output.
This will also hide any difference in unfolding a header that has been
folded with a tab. Our own header parser replaces tabs with spaces,
while gmime would retain the tab.
All test scripts to be executed are now named as T\d\d\d-name.sh,
numers in increments of 10.
This eases adding new tests and developers to see which are test scripts
that are executed by test suite and in which order.
