refactor(*): 稳定期治理 - 收敛核心架构、错误语义并修复跨项目数据竞态

backend/internal/handler/api_test.go

@@ -0,0 +1,42 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"infinite-canvas/backend/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+func TestRegisterCanvasAPIExposesOpenAPIAndProjects(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	RegisterCanvasAPI(router.Group("/api"), &service.Service{})
+
+	wanted := map[string]bool{
+		"GET /api/openapi.yaml": false,
+		"GET /api/projects":     false,
+		"POST /api/tasks":       false,
+		"GET /api/resources":    false,
+	}
+	for _, route := range router.Routes() {
+		key := route.Method + " " + route.Path
+		if _, exists := wanted[key]; exists {
+			wanted[key] = true
+		}
+	}
+	for route, found := range wanted {
+		if !found {
+			t.Errorf("route %s is not registered", route)
+		}
+	}
+
+	recorder := httptest.NewRecorder()
+	router.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/api/openapi.yaml", nil))
+	if recorder.Code != http.StatusOK || !strings.Contains(recorder.Body.String(), "openapi: 3.0.3") || !strings.Contains(recorder.Body.String(), "url: /api") {
+		t.Fatalf("openapi.yaml status=%d body=%s", recorder.Code, recorder.Body.String())
+	}
+}