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// Flags: --expose-internals
'use strict';
require('../common');
const assert = require('assert');
const FixedQueue = require('internal/fixed_queue');
{
const queue = new FixedQueue();
assert.strictEqual(queue.head, queue.tail);
assert(queue.isEmpty());
queue.push('a');
assert(!queue.isEmpty());
assert.strictEqual(queue.shift(), 'a');
assert.strictEqual(queue.shift(), null);
}
{
const queue = new FixedQueue();
for (let i = 0; i < 2047; i++)
queue.push('a');
assert(queue.head.isFull());
queue.push('a');
assert(!queue.head.isFull());
assert.notStrictEqual(queue.head, queue.tail);
for (let i = 0; i < 2047; i++)
assert.strictEqual(queue.shift(), 'a');
assert.strictEqual(queue.head, queue.tail);
assert(!queue.isEmpty());
assert.strictEqual(queue.shift(), 'a');
assert(queue.isEmpty());
}