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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()); }