urchin/tests/Cross-shell testing/Environment variable TEST_SHELL should default to sh if unset.

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#!/bin/sh
# Tests support for either passing through or defining a default value for environment variable TEST_SHELL.
# (for test scripts that want to invoke shell scripts with a specified shell).
# Test if $TEST_SHELL - if *undefined* - is exported with value '/bin/sh' by urchin
# and thus has that value inside test scripts.
s="$TEST_SHELL"
unset -v TEST_SHELL
"$s" ../../urchin ./.test-TEST_SHELL-undefined_or_empty