tests: Wait at least 30 seconds before checking the health state of the container (#2777)

test/tests.bats

@@ -4,6 +4,7 @@ export IMAGE_NAME
 IMAGE_NAME="${NAME}"
 
 setup_file() {
+  export START_TIME
   local PRIVATE_CONFIG
   PRIVATE_CONFIG=$(duplicate_config_for_container . mail)
   mv "${PRIVATE_CONFIG}/user-patches/user-patches.sh" "${PRIVATE_CONFIG}/user-patches.sh"
@@ -41,6 +42,7 @@ setup_file() {
     --health-cmd "ss --listening --tcp | grep -P 'LISTEN.+:smtp' || exit 1" \
     "${NAME}"
 
+  START_TIME=$(date +%s)
   wait_for_finished_setup_in_container mail
 
   # generate accounts after container has been started
@@ -110,6 +112,13 @@ teardown_file() {
 # Be careful with re-locating this test if earlier tests could potentially fail it by
 # triggering the `changedetector` service.
 @test "checking container healthcheck" {
+  local NOW
+  NOW=$(date +%s)
+  # ensure, that at least 30 seconds have passed since container start
+  while (( NOW - START_TIME < 31 )); do
+    sleep 1
+    NOW=$(date +%s)
+  done
   run bash -c "docker inspect mail | jq -r '.[].State.Health.Status'"
   assert_output "healthy"
   assert_success