test: report summary even when aborting

In certain cases of test suite failure, the summary report was not
being printed.  In particular, any failure on the parallel test suite,
and any aborted test in the serialized test suite would end up hiding
the summary.

It's better to always show the summary where we can (while preserving
the return code).  If we do abort due to this high-level failure,
though, we should also announce to the user that we're doing so as
close to the end of the process as possible, to make it easier to find
the problem.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

test/notmuch-test

@@ -45,6 +45,8 @@ else
 fi
 
 trap 'e=$?; kill $!; exit $e' HUP INT TERM
+
+META_FAILURE=
 # Run the tests
 if test -z "$NOTMUCH_TEST_SERIALIZE" && command -v parallel >/dev/null ; then
     test -t 1 && export COLORS_WITHOUT_TTY=t || :
@@ -57,8 +59,7 @@ if test -z "$NOTMUCH_TEST_SERIALIZE" && command -v parallel >/dev/null ; then
     fi
     RES=$?
     if [[ $RES != 0 ]]; then
-        echo "parallel test suite returned error code $RES"
-        exit $RES
+        META_FAILURE="parallel test suite returned error code $RES"
     fi
 else
     for test in $TESTS; do
@@ -69,7 +70,8 @@ else
         RES=$?
         testname=$(basename $test .sh)
         if [[ $RES != 0 && ! -e "$NOTMUCH_BUILDDIR/test/test-results/$testname" ]]; then
-            exit $RES
+            META_FAILURE="Aborting on $testname (returned $RES)"
+            break
         fi
     done
 fi
@@ -79,6 +81,12 @@ trap - HUP INT TERM
 echo
 $NOTMUCH_SRCDIR/test/aggregate-results.sh $NOTMUCH_BUILDDIR/test/test-results/*
 ev=$?
+if [ -n "$META_FAILURE" ]; then
+    printf 'ERROR: %s\n' "$META_FAILURE"
+    if [ $ev = 0 ]; then
+        ev=$RES
+    fi
+fi
 
 # Clean up
 rm -rf $NOTMUCH_BUILDDIR/test/test-results