const memoizer = require("./..");
const assert = require("chai").assert;

describe("lru-memoizer (freeze)", function () {
  var loadTimes = 0,
    memoized;

  beforeEach(function () {
    loadTimes = 0;

    memoized = memoizer({
      load: function (key, callback) {
        loadTimes++;
        callback(null, { foo: "bar", buffer: Buffer.from("1234") });
      },
      hash: function (key) {
        return key;
      },
      freeze: true,
    });
  });

  it("should return a freeze every time with the same cached structure", function (done) {
    memoized("test", function (err, r1) {
      assert.isNull(err);
      assert.strictEqual(loadTimes, 1);
      assert.equal(r1.foo, "bar");
      r1.foo = "bax";
      assert.isFrozen(r1);

      memoized("test", function (err, r2) {
        assert.isNull(err);

        assert.strictEqual(loadTimes, 1);
        assert.equal(r2.foo, "bar");
        assert.strictEqual(r1, r2);
        assert.isFrozen(r2);

        done();
      });
    });
  });
});