test(plugins): add yaegi plugin integration tests

- Smoke test: verify yaegi can load stdlib and vikunja symbols
- Loader test: load example plugin and verify Name/Version
- Routes test: verify plugin HTTP routes serve responses
- Events test: verify plugin event listener registration via Init()

pkg/plugins/yaegi/events_test.go

@@ -0,0 +1,48 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package yaegi
+
+import (
+	"testing"
+
+	"code.vikunja.io/api/pkg/log"
+)
+
+func TestPluginEventListener(t *testing.T) {
+	log.InitLogger()
+
+	loaded, err := LoadPluginFull(examplePluginDir)
+	if err != nil {
+		t.Fatalf("LoadPluginFull failed: %v", err)
+	}
+
+	// Call Init() — this registers the TestListener for TaskCreatedEvent.
+	// If the Listener interface boundary is broken, this will panic with a
+	// reflection error when calling events.RegisterListener.
+	err = loaded.Plugin.Init()
+	if err != nil {
+		t.Fatalf("plugin Init failed: %v", err)
+	}
+	t.Log("Init() succeeded — events.RegisterListener accepted the interpreted Listener")
+
+	// Verify Shutdown works too
+	err = loaded.Plugin.Shutdown()
+	if err != nil {
+		t.Fatalf("plugin Shutdown failed: %v", err)
+	}
+	t.Log("Shutdown() succeeded")
+}

pkg/plugins/yaegi/loader_test.go

@@ -0,0 +1,70 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package yaegi
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+const examplePluginDir = "../../../examples/plugins/example"
+
+func TestLoadPlugin(t *testing.T) {
+	pluginDir := examplePluginDir
+
+	mainGo := filepath.Join(pluginDir, "main.go")
+	if _, err := os.Stat(mainGo); err != nil {
+		t.Fatalf("example plugin source not found at %s: %v", mainGo, err)
+	}
+
+	p, err := LoadPlugin(pluginDir)
+	if err != nil {
+		t.Fatalf("LoadPlugin failed: %v", err)
+	}
+
+	if p.Name() != "example" {
+		t.Errorf("expected plugin name 'example', got %q", p.Name())
+	}
+	if p.Version() != "1.0.0" {
+		t.Errorf("expected version '1.0.0', got %q", p.Version())
+	}
+}
+
+func TestLoadPluginFull(t *testing.T) {
+	loaded, err := LoadPluginFull(examplePluginDir)
+	if err != nil {
+		t.Fatalf("LoadPluginFull failed: %v", err)
+	}
+
+	if loaded.Plugin == nil {
+		t.Fatal("Plugin is nil")
+	}
+	if loaded.Plugin.Name() != "example" {
+		t.Errorf("expected plugin name 'example', got %q", loaded.Plugin.Name())
+	}
+
+	if loaded.AuthRouter == nil {
+		t.Fatal("AuthRouter is nil — typed factory NewAuthenticatedRouterPlugin not found")
+	}
+	t.Logf("AuthRouter type: %T, name: %s", loaded.AuthRouter, loaded.AuthRouter.Name())
+
+	if loaded.UnauthRouter == nil {
+		t.Fatal("UnauthRouter is nil — typed factory NewUnauthenticatedRouterPlugin not found")
+	}
+	t.Logf("UnauthRouter type: %T, name: %s", loaded.UnauthRouter, loaded.UnauthRouter.Name())
+}

pkg/plugins/yaegi/routes_test.go

@@ -0,0 +1,63 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package yaegi
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"code.vikunja.io/api/pkg/log"
+	"github.com/labstack/echo/v5"
+)
+
+func TestPluginRoutesServeHTTP(t *testing.T) {
+	log.InitLogger()
+	loaded, err := LoadPluginFull(examplePluginDir)
+	if err != nil {
+		t.Fatalf("LoadPluginFull failed: %v", err)
+	}
+
+	if loaded.UnauthRouter == nil {
+		t.Fatal("UnauthRouter is nil — cannot test route registration")
+	}
+
+	// Create a real Echo instance and register the plugin's unauthenticated routes
+	e := echo.New()
+	g := e.Group("/plugins")
+	loaded.UnauthRouter.RegisterUnauthenticatedRoutes(g)
+
+	// Make an HTTP request to the plugin's /status endpoint
+	req := httptest.NewRequest(http.MethodGet, "/plugins/status", nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("expected status 200, got %d, body: %s", rec.Code, rec.Body.String())
+	}
+
+	body := rec.Body.String()
+	if !strings.Contains(body, "example") {
+		t.Errorf("response body should contain plugin name 'example', got: %s", body)
+	}
+	if !strings.Contains(body, "ok") {
+		t.Errorf("response body should contain status 'ok', got: %s", body)
+	}
+
+	t.Logf("HTTP response: %s", body)
+}

pkg/yaegi_symbols/stdlib_check_test.go

@@ -0,0 +1,26 @@
+package yaegi_symbols
+
+import (
+	"testing"
+
+	"github.com/traefik/yaegi/interp"
+	"github.com/traefik/yaegi/stdlib"
+)
+
+func TestYaegiSmoke(t *testing.T) {
+	i := interp.New(interp.Options{})
+	i.Use(stdlib.Symbols)
+
+	_, err := i.Eval(`import "fmt"`)
+	if err != nil {
+		t.Fatalf("import failed: %v", err)
+	}
+
+	v, err := i.Eval(`fmt.Sprintf("hello %s", "yaegi")`)
+	if err != nil {
+		t.Fatalf("eval failed: %v", err)
+	}
+	if v.String() != "hello yaegi" {
+		t.Fatalf("unexpected result: %s", v.String())
+	}
+}