优化结构

internal/data/system/media_test.go

@@ -0,0 +1,33 @@
+package system
+
+import (
+	"context"
+	"testing"
+
+	"kra/internal/biz"
+)
+
+func TestMediaListKeepsZeroPageSizeContract(t *testing.T) {
+	data := newTransactionTestData(t)
+	repo := &mediaRepo{data: data}
+	ctx := context.Background()
+	if err := repo.CreateMedia(ctx, &biz.MediaFile{Name: "one.txt"}); err != nil {
+		t.Fatal(err)
+	}
+
+	items, total, err := repo.ListMedia(ctx, biz.MediaFilter{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if total != 1 || len(items) != 0 {
+		t.Fatalf("zero-size media page = %d items with total %d, want 0/1", len(items), total)
+	}
+}
+
+func TestMediaBatchImportRejectsEmptySlice(t *testing.T) {
+	data := newTransactionTestData(t)
+	err := (&mediaRepo{data: data}).CreateMediaBatch(context.Background(), nil)
+	if err == nil {
+		t.Fatal("empty media import unexpectedly succeeded")
+	}
+}