from linetoday.metrics import MetricsRecorder


def test_metrics_recorder_snapshot_and_format():
    metrics = MetricsRecorder()
    metrics.inc('requests')
    metrics.inc('requests', 2)
    metrics.observe('latency_ms', 100.0)
    metrics.observe('latency_ms', 50.0)

    snap = metrics.snapshot()
    assert snap['counters']['requests'] == 3
    assert snap['timers']['latency_ms']['count'] == 2
    assert snap['timers']['latency_ms']['avg'] == 75.0

    formatted = metrics.format_snapshot()
    assert 'requests=3' in formatted
    assert 'latency_ms' in formatted