diff --git a/.forgejo/workflows/pr.yml b/.forgejo/workflows/pr.yml
index d0c6bd1..a93d79b 100644
--- a/.forgejo/workflows/pr.yml
+++ b/.forgejo/workflows/pr.yml
@@ -19,17 +19,17 @@ jobs:
         id: test
         run: |
           go test -c
-          RUN_FOREVER=1 ./ovh-dns-update.test &
+          ACTION_TESTING=1 ./ovh-dns-update.test &
           sleep 1
           ls .
           echo $GITHUB_OUTPUT
       - name: update a record
         uses: ./
         with:
-          subdomain: sub
+          subdomain: _release
           domain: example.org
-          record-id: 123
-          value: v=1.2.3
+          record-id: 12345
+          value: v=42
           ovh-endpoint: ${{ steps.test.outputs.OVH_ENDPOINT }}
           ovh-app-key: KEY
           ovh-app-secret: SECRET
diff --git a/main_test.go b/main_test.go
index 5e1acf4..732068e 100644
--- a/main_test.go
+++ b/main_test.go
@@ -39,8 +39,6 @@ func TestRun(t *testing.T) {
 	t.Cleanup(s.Close)
 	action := githubactions.New(githubactions.WithGetenv(func(key string) string {
 		switch key {
-		case "GITHUB_OUTPUT":
-			return os.Getenv(key)
 		case "INPUT_OVH-ENDPOINT":
 			return "http://" + s.Listener.Addr().String()
 		}
@@ -50,8 +48,32 @@ func TestRun(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if os.Getenv("RUN_FOREVER") == "1" {
-		action.SetOutput("OVH_ENDPOINT", "http://"+s.Listener.Addr().String())
+
+	// for action testing (see .forgejo/workflows/pr.yml)
+	if os.Getenv("ACTION_TESTING") == "1" {
+		s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			switch r.URL.Path {
+			default:
+				msg := fmt.Sprintf("unexpected request on %s", r.URL.Path)
+				http.Error(w, msg, http.StatusBadRequest)
+				t.Error(msg)
+			case "/auth/time":
+			case "/domain/zone/example.org/record/12345":
+				buf, err := io.ReadAll(r.Body)
+				if err != nil {
+					msg := fmt.Sprintf("could not read request body: %v", err)
+					http.Error(w, msg, http.StatusBadRequest)
+					t.Error(msg)
+				}
+				if string(buf) != `{"subDomain":"_release","target":"\"v=1.42\""}` {
+					msg := fmt.Sprintf("unexpected body: %s", string(buf))
+					http.Error(w, msg, http.StatusBadRequest)
+					t.Error(msg)
+				}
+			}
+		}))
+		t.Cleanup(s.Close)
+		githubactions.SetOutput("OVH_ENDPOINT", "http://"+s.Listener.Addr().String())
 		select {}
 	}
 }