rafa/test/unit/core/Stream-collect.js

Rafa.js is a Javascript framework for building concurrent applications.

module.exports = (assert, Rafa) => {
  suite("collect", () => {
    test("maps values", () => {
      var values = [];
      var a = Rafa.stream();
      a.collect(v => v + 1).each(value => values.push(value));
      a.push(Rafa.context(), Rafa.message(1));
      assert.equal(values.length, 1);
      assert.equal(values[0], 2);
    });

    test("does not notify when collector returns undefined", () => {
      var values = [];
      var a = Rafa.stream();
      a.collect(v => undefined).each(value => values.push(value));
      a.push(Rafa.context(), Rafa.message(1));
      assert.equal(values.length, 0);
    });

    test("does not notify when collector returns null", () => {
      var values = [];
      var a = Rafa.stream();
      a.collect(v => null).each(value => values.push(value));
      a.push(Rafa.context(), Rafa.message(1));
      assert.equal(values.length, 0);
    });

  });
};