pkg/kubeapiserver/options/testdata/client.config.json

{
    "signing": {
        "profiles": {
            "valid": {
                "expiry": "876000h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "expired": {
                "expiry": "1h",
                "not_before": "1990-12-31T23:59:00Z",
                "not_after": "1990-12-31T23:59:00Z",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            }
        }
    }
}