rafa/test/unit/core/Enumerator-until.js

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

module.exports = (assert, Rafa) => {
  suite("until", () => {
    test("emit until value", () => {
      var values = [1,2];
      var idx = 0;
      var messages = [];
      var it = Rafa.Enumerator.until(() => values[idx++], 2);
      var callback = m => messages.push(m);
      it.next(callback);
      it.next(callback);
      assert.equal(messages[0].value, 1);
      assert.equal(messages[1].value, 2);
      assert.ok(messages[1].isDone);
    });
    
    test("emit until undefined", () => {
      var values = [1];
      var idx = 0;
      var messages = [];
      var it = Rafa.Enumerator.until(() => values[idx++]);
      var callback = m => messages.push(m);
      it.next(callback);
      it.next(callback);
      assert.equal(messages[0].value, 1);
      assert.isUndefined(messages[1].value);
      assert.ok(messages[1].isDone);
    });
    
    test("throws CompleteError", () => {
      var it = Rafa.Enumerator.until(() => undefined) 
      it.next(it.noop);
      assert.throws(() => it.next(it.noop), RangeError, "Enumerator is complete");
    });

    test("emit error", () => {
      var it = Rafa.Enumerator.until(() => new Error("foo"));
      it.next(function(message){
        assert.ok(message.isError);
        assert.ok(message.error instanceof Error);
        assert.equal(message.error.message, "foo");
      });
    });
  });
};