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

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

module.exports = (assert, Rafa) => {
  suite("reduce", () => {
    test("sum", () => {
      var stream = Rafa.stream();
      var values = [];
      stream.reduce((a, b) => a + b)
        .each(v => values.push(v))
        .done(v => values.push(v));
      stream.enumerate(Rafa.Enumerator.array([1,2,3]));
      assert.equal(values.length, 2);
      assert.equal(values[0], 6);
    });

    test("single done message with undefined value", () => {
      var stream = Rafa.stream();
      var values = [];
      stream.reduce((a, b) => a + b)
        .each(v => values.push(v))
        .done(v => values.push(v));
      Rafa.doneMessage().push(stream);
      assert.equal(values.length, 1);
      assert.isUndefined(values[1]);
      assert.isUndefined(values[2]);
    });
    
    test("single done message with value", () => {
      var stream = Rafa.stream();
      var values = [];
      stream.reduce((a, b) => a + b)
        .each(v => values.push(v))
        .done(v => values.push(v));
      Rafa.doneMessage(1).push(stream);
      assert.equal(values.length, 2);
      assert.equal(values[0], 1);
      assert.equal(values[1], 1);
    });

  });
};