feat: 补齐模块接口契约与管理 API 文档

internal/app/group/service_test.go

@@ -0,0 +1,25 @@
+package group
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"git.asio.asia/nixevol/NixMsg/internal/protocol"
+)
+
+func TestStubCreateNotImplemented(t *testing.T) {
+	s := NewStub()
+	_, err := s.Create(context.Background(), "a", &protocol.GroupCreate{Name: "g"})
+	if !errors.Is(err, ErrNotImplemented) {
+		t.Fatalf("got %v", err)
+	}
+}
+
+func TestStubListEmpty(t *testing.T) {
+	s := NewStub()
+	items, cursor, err := s.List(context.Background(), "a", &protocol.GroupList{})
+	if err != nil || len(items) != 0 || cursor != "" {
+		t.Fatalf("items=%v cursor=%q err=%v", items, cursor, err)
+	}
+}