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

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

module.exports = (assert, Rafa) => {
  suite("merge", () => {
    test("structure", () => {
      var stream1 = Rafa.stream();
      var stream2 = Rafa.stream();
      var stream3 = Rafa.stream();
      var merged = stream1.merge(stream2, stream3);
      assert.isNotNull(stream1.child);
      assert.isNotNull(stream2.child);
      assert.isNotNull(stream3.child);
      assert.isNull(merged.parent);
      assert.equal(stream1.child.handler, stream2.child.handler);
      assert.equal(stream1.child.handler, stream3.child.handler);
    });

    test("values", () => {
      var stream1 = Rafa.stream();
      var stream2 = Rafa.stream();
      var merged = stream1.merge(stream2);
      var values = [];
      merged.each(v => values.push(v));
      stream1.enumerate(Rafa.Enumerator.array([1]));
      stream2.enumerate(Rafa.Enumerator.array([2]));
      assert.equal(values.length, 2);
      assert.equal(values[0], 1);
      assert.equal(values[1], 2);
    });
    
    test("errors", () => {
      var stream1 = Rafa.stream();
      var stream2 = Rafa.stream();
      var merged = stream1.merge(stream2);
      var values = [];
      merged.error(v => values.push(v));
      stream1.push(Rafa.context(), Rafa.errorMessage(1));
      stream2.push(Rafa.context(), Rafa.errorMessage(2));
      assert.equal(values.length, 2);
      assert.equal(values[0], 1);
      assert.equal(values[1], 2);
    });

    test("done", () => {
      var stream1 = Rafa.stream();
      var stream2 = Rafa.stream();
      var merged = stream1.merge(stream2);
      var dones = 0;
      merged.done(v => dones++);
      stream1.push(Rafa.context(), Rafa.doneMessage());
      stream2.push(Rafa.context(), Rafa.doneMessage());
      assert.equal(dones, 1);
    });

    test("detach", () => {
      var stream1 = Rafa.stream();
      var stream2 = Rafa.stream();
      var merged = stream1.merge(stream2);
      var proxy1 = stream1.child;
      var proxy2 = stream2.child;
      merged.detach();
      assert.isNull(stream1.child);
      assert.isNull(stream2.child);
    });
  });
};