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

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

module.exports = (assert, Rafa) => {
  suite("shift", () => {
    test("length is 0", () => {
      assert.isUndefined(Rafa.buffer(1).shift());
    });

    test("length is 1 start is 0", () => {
      var buffer = Rafa.buffer(3);
      buffer.push(1);
      assert.equal(buffer.shift(), 1);
      assert.equal(buffer.start, 0);
      assert.equal(buffer.length, 0);
      assert.isNull(buffer.buffer[0]);
    });

    test("length is 2 start is 0", () => {
      var buffer = Rafa.buffer(3);
      buffer.push(1);
      buffer.push(2);
      assert.equal(buffer.shift(), 1);
      assert.equal(buffer.start, 1);
      assert.equal(buffer.length, 1);
      assert.isNull(buffer.buffer[0]);
      assert.equal(buffer.head(), 2);
      assert.equal(buffer.tail(), 2);
    });

    test("start is upper bound", () => {
      var buffer = Rafa.buffer(2);
      buffer.push(1);
      buffer.push(2);
      assert.equal(buffer.shift(), 1);
      assert.equal(buffer.start, 1);
      assert.equal(buffer.length, 1);

      assert.equal(buffer.shift(), 2);
      assert.equal(buffer.start, 1);
      assert.equal(buffer.length, 0);
    });
  });
};