update: some tests for upgrade

test/just-etc-test-1.0.PKGBUILD

@@ -0,0 +1,25 @@
+pkgname="just-etc-test"
+pkgver="1.0"
+homepage="https://gitea.phywyj.dynv6.net"
+pkgdesc="just touch /etc/test"
+license=("GPL")
+sources=()
+urls=()
+md5sums=()
+
+src_prepare() {
+  :
+}
+
+src_build() {
+  touch "test"
+}
+
+src_check() {
+  :
+}
+
+src_install() {
+  echo "src_install"
+  install -D -v -m644 "test" "${pkgdir}/etc/test"
+}