def test_kubernetes_metrics_get_memory_used(
        kubernetes_metrics_obj: KubernetesMetrics) -> None:
    """
    This test verifies that KubernetesMetrics.get_memory_used() returns the correct value for defined metrics.

    :param kubernetes_metrics_obj: The pre-loaded KubernetesMetrics fixture object for testing.
    """
    assert kubernetes_metrics_obj.get_memory_used("node") == "14%"
    assert kubernetes_metrics_obj.get_memory_used("pod") is None
def test_kubernetes_metrics_get_memory_used_missing(
        kubernetes_metrics_obj: KubernetesMetrics) -> None:
    """
    This test verifies that KubernetesMetrics.get_memory_used() returns None for undefined metrics.

    :param kubernetes_metrics_obj: The pre-loaded KubernetesMetrics fixture object for testing.
    """
    assert kubernetes_metrics_obj.get_memory_used("foo") is None