node-teen_process/test/circular-buffer.spec.ts at 0533d7408ce2c866fab9c07783ea3d86e2da1db2 · mykola-mokhnach/node-teen_process · GitHub

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import assert from 'node:assert/strict';
import {CircularBuffer} from '../lib/circular-buffer.js';
import {describe, it} from 'node:test';

describe('CircularBuffer', function () {
  it('should properly rotate', function () {
    const maxSize = 100;
    const buffer = new CircularBuffer(maxSize);
    assert.strictEqual(buffer.count, 0);
    assert.strictEqual(buffer.size, 0);
    buffer.add(Buffer.from('x'.repeat(maxSize)));
    assert.strictEqual(buffer.count, 1);
    assert.strictEqual(buffer.size, maxSize);
    assert.deepStrictEqual(buffer.value(), Buffer.from('x'.repeat(maxSize)));
    buffer.add(Buffer.from('y'.repeat(maxSize)));
    assert.strictEqual(buffer.count, 1);
    assert.strictEqual(buffer.size, 85);
    assert.deepStrictEqual(buffer.value(), Buffer.from('y'.repeat(85)));
  });

  it('should properly rotate if the incoming value is too large', function () {
    const maxSize = 100;
    const buffer = new CircularBuffer(maxSize);
    assert.strictEqual(buffer.count, 0);
    assert.strictEqual(buffer.size, 0);
    buffer.add(Buffer.from('x'.repeat(maxSize)));
    assert.strictEqual(buffer.count, 1);
    assert.strictEqual(buffer.size, maxSize);
    assert.deepStrictEqual(buffer.value(), Buffer.from('x'.repeat(maxSize)));
    buffer.add(Buffer.from('y'.repeat(maxSize + 10)));
    assert.strictEqual(buffer.count, 1);
    assert.strictEqual(buffer.size, 85);
    assert.deepStrictEqual(buffer.value(), Buffer.from('y'.repeat(85)));
  });
});