rafa/test/unit/core/Channel-write.js

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

module.exports = function(assert, Rafa) {
  suite("write", () => {
    test("has callback", () => {
      var l = Rafa.channel();
      var value;
      var callback = m => value = m;
      l.callback = callback;
      l.write(1);
      assert.equal(value, 1);
      assert.isNull(l.callback);
    });

    test("has size & no callback", () => {
      var l = Rafa.channel(2);
      l.write(1);
      assert.equal(l.buffer.length, 1);
      assert.equal(l.buffer.buffer[0], 1);
      
      l.write(2);
      assert.equal(l.buffer.length, 2);
      assert.equal(l.buffer.buffer[0], 1);
      assert.equal(l.buffer.buffer[1], 2);
    });

    test("drop & keep first in: size of 1", () => {
      var l = Rafa.channel(1);
      l.write(1);
      l.write(2);
      assert.equal(l.buffer.length, 1);
      assert.equal(l.buffer.buffer[0], 1);
    });
    
    test("drop & keep first in: size of 4", () => {
      var l = Rafa.channel(4);
      var i = 0;
      while (i < 6) l.write(i++);
      assert.equal(l.buffer.length, 4);
      assert.equal(l.buffer.buffer[0], 0);
      assert.equal(l.buffer.buffer[1], 1);
      assert.equal(l.buffer.buffer[2], 2);
      assert.equal(l.buffer.buffer[3], 3);
    });

    test("drop & keep last in: rotate with size of 1", () => {
      var l = Rafa.channel(1, 'rotate');
      l.write(1);
      l.write(2);
      assert.equal(l.buffer.length, 1);
      assert.equal(l.buffer.buffer[0], 2);
    });

    test("drop & keep last in: rotate with size of 4", () => {
      var l = Rafa.channel(4, 'rotate');
      var i = 0;
      while (i < 6) l.write(i++);
      assert.equal(l.buffer.length, 4);
      assert.equal(l.buffer.buffer[0], 4);
      assert.equal(l.buffer.buffer[1], 5);
      assert.equal(l.buffer.buffer[2], 2);
      assert.equal(l.buffer.buffer[3], 3);
    });
  });
};