kubernetes/staging/src/k8s.io/client-go/util/cert/cert_test.go

const COMMON_NAME …

// TestSelfSignedCertHasSAN verifies the existing of
// a SAN on the generated self-signed certificate.
// a SAN ensures that the certificate is considered
// valid by default in go 1.15 and above, which
// turns off fallback to Common Name by default.
func TestSelfSignedCertHasSAN(t *testing.T) { … }