rsxjs/__tests__/integration/channel/test-ro.js

Resilience Extensions for JS.

/**
 * @file tests/channel/test-ro.js
 * @copyright 2018-present Karim Alibhai. All rights reserved.
 */

import { test } from "../../helpers";

import { makeChan } from "../../../";

function isReadable(t, c, shouldPass) {
  const method = shouldPass ? "is" : "not";
  t[method](
    typeof c.take,
    "function",
    `channel should${shouldPass ? "" : " not"} have a take() method`
  );
  t[method](
    typeof c.select,
    "function",
    `channel should${shouldPass ? "" : " not"} have a select() method`
  );
  t[method](
    typeof c[Symbol.asyncIterator],
    "function",
    `channel should${shouldPass ? "" : " not"} support async iterator protocol`
  );
}

function isWritable(t, c, shouldPass) {
  const method = shouldPass ? "is" : "not";
  t[method](
    typeof c.put,
    "function",
    `channel should${shouldPass ? "" : " not"} have a put() method`
  );
}

test("readonly & writeonly channels", async (t) => {
  const chan = makeChan();

  // default channel should be readwrite
  isReadable(t, chan, true);
  isWritable(t, chan, true);

  // test readOnly channel
  const ro = chan.readOnly();
  isReadable(t, ro, true);
  isWritable(t, ro, false);

  // test writeOnly channel
  const wo = chan.writeOnly();
  isReadable(t, wo, false);
  isWritable(t, wo, true);
});