self tests: avoid spurious failures on older bash

Fixes automake bug#11909.

* t/self-check-explicit-skips.sh: Remove or rework few checks for use
cases that are no more relevant nor supported now that we've got rid
of the need to use the 'Exit' function explicitly.  Make the other
existing checks stricter.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/t/self-check-explicit-skips.sh b/t/self-check-explicit-skips.sh
index eb60dc2..97f5288 100755 (executable)
--- a/t/self-check-explicit-skips.sh
+++ b/t/self-check-explicit-skips.sh
@@ -36,22 +36,19 @@ run_dummy_test ()
   " dummy.sh
 }
 
-run_dummy_test '(exit 77); exit 77'
+run_dummy_test 'exit 77'
 test $? -eq 77 || exit 1
 
 run_dummy_test 'sh -c "exit 77"' am_explicit_skips=no
 test $? -eq 77 || exit 1
 
-run_dummy_test '(exit 77); exit 77' am_explicit_skips=yes 
+run_dummy_test '$PERL -e "exit 77"; true' am_explicit_skips=yes
 test $? -eq 78 || exit 1
 
-run_dummy_test 'sh -c "exit 77"' am_explicit_skips=y
+run_dummy_test 'sh -c "exit 77"; exit 0' am_explicit_skips=y
 test $? -eq 78 || exit 1
 
-run_dummy_test 'exit 77' am_explicit_skips=yes
-test $? -eq 77 || exit 1
-
-run_dummy_test 'skip_ "foo"' am_explicit_skips=y
+run_dummy_test 'skip_ "foo"; :' am_explicit_skips=y
 test $? -eq 77 || exit 1
 
 :