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import { opine } from "../../mod.ts";import { describe, it } from "../utils.ts";import { superdeno } from "../deps.ts";
describe("res.vary()", function () {  describe("with a string", function () {    it("should set the value", function (done) {      const app = opine();
      app.use(function (req, res) {        res.vary("Accept");        res.end();      });
      superdeno(app)        .get("/")        .expect("vary", /Accept/)        .expect(200, done);    });  });
  describe("when the value is present", function () {    it("should not add it again", function (done) {      const app = opine();
      app.use(function (_req, res) {        res.vary("Accept");        res.vary("Accept-Encoding");        res.vary("Accept-Encoding");        res.vary("Accept-Encoding");        res.vary("Accept");        res.end();      });
      superdeno(app)        .get("/")        .expect("Vary", "Accept, Accept-Encoding")        .expect(200, done);    });  });});