junit5.eclass: use JAVA_TEST_SRC_DIR as an array

Some ebuilds using junit5.eclass had to call testng_src_test() multiple
times, once for each member of ${JAVA_TEST_SRC_DIR[@]}.

Closes: https://bugs.gentoo.org/965113
Signed-off-by: Volkmar W. Pogatzki <gentoo@pogatzki.net>
Part-of: https://github.com/gentoo/gentoo/pull/44442
Signed-off-by: Miroslav Šulc <fordfrog@gentoo.org>

eclass/junit5.eclass

@@ -387,8 +387,7 @@ _junit5_src_test_traditional() {
 	if [[ -n ${JAVA_TEST_RUN_ONLY} ]]; then
 		tests_to_run="${JAVA_TEST_RUN_ONLY[@]}"
 	else
-		pushd "${JAVA_TEST_SRC_DIR}" > /dev/null || die
-		tests_to_run=$(find * -type f\
+		tests_to_run=$(find ${JAVA_TEST_SRC_DIR[@]} -type f\
 			\( -name "*Test.java"\
 			-o -name "Test*.java"\
 			-o -name "*Tests.java"\
@@ -397,11 +396,10 @@ _junit5_src_test_traditional() {
 			! -name "*BaseTest*"\
 			! -name "*TestTypes*"\
 			! -name "*TestUtils*"\
-			! -name "*\$*")
+			! -name "*\$*" -printf '%P\n')
 		tests_to_run=${tests_to_run//"${classes}"\/}
 		tests_to_run=${tests_to_run//.java}
 		tests_to_run=${tests_to_run//\//.}
-		popd > /dev/null || die
 
 		# exclude extra test classes, usually corner cases
 		# that the code above cannot handle