tests: add common tests

tests/common.bats

@@ -0,0 +1,61 @@
+#!/usr/bin/env bats
+
+: ${BRANCH:=edge}
+VER=${BRANCH#v}
+TAG=${VER}-test
+
+setup() {
+  docker history alpine:$TAG >/dev/null 2>&1
+}
+
+@test "version is correct $VER" {
+  case $BRANCH in
+  edge) skip;;
+  esac
+  run docker run alpine:$TAG sh -c '. ./etc/os-release; echo ${VERSION_ID%.*}'
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "$VER" ]
+}
+
+@test "package installs cleanly" {
+  run docker run alpine:$TAG apk add --no-cache bash
+  [ $status -eq 0 ]
+}
+
+@test "timezone" {
+  run docker run alpine:$TAG date +%Z
+  [ $status -eq 0 ]
+  [ "$output" = "UTC" ]
+}
+
+@test "repository list is correct" {
+  run docker run alpine:$TAG cat /etc/apk/repositories
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "http://dl-cdn.alpinelinux.org/alpine/$BRANCH/main" ]
+  [ "${lines[1]}" = "http://dl-cdn.alpinelinux.org/alpine/$BRANCH/community" ]
+  [ "${lines[2]}" = "" ]
+}
+
+@test "cache is empty" {
+  run docker run alpine:$TAG sh -c "ls -1 /var/cache/apk | wc -l"
+  [ $status -eq 0 ]
+  [ "$output" = "0" ]
+}
+
+@test "root password is disabled with default su" {
+  run docker run --user nobody alpine:$TAG su
+  [ $status -eq 1 ]
+}
+
+@test "root login is disabled" {
+  run docker run alpine:$TAG awk -F: '$1=="root"{print $2}' /etc/shadow
+  [ $status -eq 0 ]
+  [ "$output" = "!" ]
+}
+
+@test "/dev/null should be missing" {
+  run sh -c "docker export $(docker create alpine:$TAG) | tar -t dev/null"
+  [ "$output" != "dev/null" ]
+  [ $status -ne 0 ]
+}
+