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

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

module.exports = (assert, Rafa) => {
  suite("drop", () => {
    test("-1", () => {
      var stream = Rafa.stream();
      var results = [];
      var child = stream.drop(-1);
      child.each(v => results.push(v));
      stream.enumerate(Rafa.Enumerator.array([1,2]));
      assert.equal(results.length, 2);
      assert.equal(results[0], 1);
      assert.equal(results[1], 2);
    });

    test("0", () => {
      var stream = Rafa.stream();
      var results = [];
      var child = stream.drop(0);
      child.each(v => results.push(v));
      stream.enumerate(Rafa.Enumerator.array([1,2]));
      assert.equal(results.length, 2);
      assert.equal(results[0], 1);
      assert.equal(results[1], 2);
    });

    test("1", () => {
      var stream = Rafa.stream();
      var results = [];
      var child = stream.drop(1);
      child.each(v => results.push(v));
      stream.enumerate(Rafa.Enumerator.array([1,2]));
      assert.equal(results.length, 1);
      assert.equal(results[0], 2);
    });

    test("2", () => {
      var stream = Rafa.stream();
      var results = [];
      var child = stream.drop(2);
      child.each(v => results.push(v));
      stream.enumerate(Rafa.Enumerator.array([1,2,3]));
      assert.equal(results.length, 1);
      assert.equal(results[0], 3);
    });
  });
};