tests: add a test for the error message

plugins/domains/core-post-deploy

@@ -25,7 +25,7 @@ trigger-domains-core-post-deploy() {
     fi
 
     if [[ "$domain" =~ $RE_IPV6 ]]; then
-      dokku_log_warn "Detected IPv4 domain name with nginx proxy enabled."
+      dokku_log_warn "Detected IPv6 domain name with nginx proxy enabled."
       dokku_log_warn "Ensure the default nginx site is removed before continuing."
       break
     fi

tests/unit/domains.bats

@@ -355,3 +355,21 @@ teardown() {
   echo "status: $status"
   assert_success
 }
+
+@test "(domains) verify warning on ipv4/ipv6 domain name" {
+  touch /etc/nginx/sites-enabled/default
+  rm "$DOKKU_ROOT/VHOST"
+  echo "127.0.0.1" >"$DOKKU_ROOT/VHOST"
+  run deploy_app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Detected IPv4 domain name with nginx proxy enabled."
+
+  rm -f /etc/nginx/sites-enabled/default
+  run /bin/bash -c "dokku ps:rebuild $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Detected IPv4 domain name with nginx proxy enabled." 0
+}