tests: simplify sourcing of helper shell files Now that the early $PATH setup in both 'runtest' and AM_TESTS_ENVIRONMENT allow the '.' built-in to find to-be-sourced shell scripts in the 't/ax/' directory automatically, we can simplify several usages like: . "$am_testauxdir"/foo.sh to just: . foo.sh Also, because our test scripts run with the 'errexit' flag active, and because POSIX mandates that, when the '.' built-in is used, ... if no readable file is found, a non-interactive shell shall abort ... we can further simplify usages like: . "$am_testauxdir"/foo.sh || fatal_ "sourcing foo.sh" once again to to just: . foo.sh * ./defs, several tests: Adjusted. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>