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

    :param kubernetes_metrics_obj: The pre-loaded KubernetesMetrics fixture object for testing.
    """
    assert kubernetes_metrics_obj.get_cpu_cores("node") == "398m"
    assert kubernetes_metrics_obj.get_cpu_cores("pod") == "13m"
def test_kubernetes_metrics_get_cpu_cores_missing(
        kubernetes_metrics_obj: KubernetesMetrics) -> None:
    """
    This test verifies that KubernetesMetrics.get_cpu_cores() returns None for undefined metrics.

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