tests/runtime/RuntimeMetricsCollector.test.ts

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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
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 *     http://www.apache.org/licenses/LICENSE-2.0
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/* eslint-env jest */

import RuntimeMetricsCollector from '../../src/agent/core/meter/RuntimeMetricsCollector';

describe('RuntimeMetricsCollector', () => {
  let collector: RuntimeMetricsCollector;

  beforeEach(() => {
    collector = new RuntimeMetricsCollector();
  });

  afterEach(() => {
    collector.destroy();
  });

  it('maps Node.js runtime data into nodejs meter fields', () => {
    const snapshot = collector.sample();
    const meters = collector.toMeterData(snapshot);
    const names = meters.map((meter) => meter.getSinglevalue()?.getName());

    expect(names).toEqual(
      expect.arrayContaining([
        'instance_nodejs_process_cpu',
        'instance_nodejs_heap_used',
        'instance_nodejs_heap_total',
        'instance_nodejs_heap_limit',
        'instance_nodejs_rss',
        'instance_nodejs_external_memory',
      ]),
    );

    expect(names).toHaveLength(6);

    for (const meter of meters) {
      expect(meter.getSinglevalue()?.getValue()).toBeGreaterThanOrEqual(0);
    }
  });
});