test(backend): setupAPI points BooksDir at os.TempDir and resets shared loginrl key

backend/internal/api/auth_test.go

@@ -7,8 +7,11 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"path/filepath"
 	"testing"
 
+	"github.com/redis/go-redis/v9"
+
 	"booklib/internal/auth"
 	"booklib/internal/db"
 	"booklib/internal/redispkg"
@@ -38,7 +41,16 @@ func setupAPI(t *testing.T) (*store.Store, http.Handler) {
 		t.Fatal(err)
 	}
 	cfg := testCfg()
+	cfg.BooksDir = filepath.Clean(os.TempDir())
+	cfg.CacheDir = t.TempDir()
 	r := NewRouter(cfg, st, redispkg.New(os.Getenv("REDIS_URL")))
+	if u := os.Getenv("REDIS_URL"); u != "" { // 测试卫生: 共享 redis 上重置登录限流桶, 防跨测试累计 429
+		if opt, e := redis.ParseURL(u); e == nil {
+			rc := redis.NewClient(opt)
+			rc.Del(ctx, "loginrl:192.0.2.1")
+			rc.Close()
+		}
+	}
 	return st, r
 }