lib/tests: Set hardening pragmas

Makes any programming errors more likely to show up early.

Non-obvious changes because of this:

- Ignore the `evalConfig` result in `reportFailure`; we're not checking
  it at that point.
- Pre-increment `$fail` and `$pass` to make sure the arithmetic doesn't
  result in a zero, which would result in a non-zero exit code for the
  expression.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/tests/sources.sh b/lib/tests/sources.sh
index 68d21d2aa6d..a7f490a79d7 100755
--- a/lib/tests/sources.sh
+++ b/lib/tests/sources.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 set -euo pipefail
+shopt -s inherit_errexit
 
 # Use
 #     || die