rafa/test/unit/core/RingBuffer-push.js

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

module.exports = (assert, Rafa) => {
  suite("push", () => {
    test("fill to capacity without overwrite", () => {
      var buffer = Rafa.buffer(3, false);
      assert.equal(buffer.capacity, 3);
      assert.equal(buffer.buffer.length, 3);
      assert.equal(buffer.start, 0);
      assert.equal(buffer.length, 0);
      assert.ok(!buffer.overwrite);
      assert.isUndefined(buffer.head());
      assert.isUndefined(buffer.tail());

      for (var i = 1; i <= 3; i++) {
        assert.equal(buffer.push(i), 1);
        assert.equal(buffer.start, 0);
        assert.equal(buffer.length, i);
        assert.equal(buffer.buffer[i-1], i);
        assert.equal(buffer.head(), buffer.buffer[0]);
        assert.equal(buffer.tail(), buffer.buffer[i-1]);
      }

      assert.equal(buffer.push(4), 0);
      assert.equal(buffer.head(), buffer.buffer[0]);
      assert.equal(buffer.tail(), buffer.buffer[2]);
    });
    
    test("fill to capacity with overwrite", () => {
      var buffer = Rafa.buffer(3);
      assert.equal(buffer.capacity, 3);
      assert.equal(buffer.buffer.length, 3);
      assert.equal(buffer.start, 0);
      assert.equal(buffer.length, 0);
      assert.ok(buffer.overwrite);

      for (var i = 1; i <= 3; i++) {
        assert.equal(buffer.push(i), 1);
        assert.equal(buffer.start, 0);
        assert.equal(buffer.length, i);
        assert.equal(buffer.buffer[i-1], i);
      }

      assert.equal(buffer.push(4), 2);
      assert.equal(buffer.start, 1);
      assert.equal(buffer.length, 3);
      assert.equal(buffer.buffer[0], 4);
      assert.equal(buffer.head(), buffer.buffer[1]);
      assert.equal(buffer.tail(), buffer.buffer[0]);
      
      assert.equal(buffer.push(5), 2);
      assert.equal(buffer.start, 2);
      assert.equal(buffer.buffer[1], 5);
      
      assert.equal(buffer.push(6), 2);
      assert.equal(buffer.start, 0);
      assert.equal(buffer.buffer[2], 6);
    });
  });
};