MVP: 按 07 风格重写前端 + Go 后端落地（长文/短文、编辑器、后台管理）

backend/internal/db/db_test.go

@@ -0,0 +1,28 @@
+package db
+
+import "testing"
+
+func TestRebind(t *testing.T) {
+	sqlite := &DB{Dialect: SQLite}
+	pg := &DB{Dialect: Postgres}
+
+	q := "SELECT * FROM posts WHERE kind = ? AND status = ? LIMIT ? OFFSET ?"
+
+	if got := sqlite.Rebind(q); got != q {
+		t.Errorf("sqlite must keep ? placeholders, got %q", got)
+	}
+
+	want := "SELECT * FROM posts WHERE kind = $1 AND status = $2 LIMIT $3 OFFSET $4"
+	if got := pg.Rebind(q); got != want {
+		t.Errorf("postgres rebind:\n got %q\nwant %q", got, want)
+	}
+}
+
+func TestAutoInc(t *testing.T) {
+	if got := (&DB{Dialect: SQLite}).AutoInc(); got != "INTEGER PRIMARY KEY AUTOINCREMENT" {
+		t.Errorf("sqlite autoincrement = %q", got)
+	}
+	if got := (&DB{Dialect: Postgres}).AutoInc(); got != "BIGSERIAL PRIMARY KEY" {
+		t.Errorf("postgres autoincrement = %q", got)
+	}
+}