diff --git a/pkg/controller/csr_check_test.go b/pkg/controller/csr_check_test.go
index 4709d0f35..dd41cc40e 100644
--- a/pkg/controller/csr_check_test.go
+++ b/pkg/controller/csr_check_test.go
@@ -42,24 +42,26 @@ var goodCSR, goodCSRECDSA, extraAddr, otherName, noNamePrefix, noGroup, clientGo
 var presetTimeCorrect, presetTimeExpired time.Time
 
 const (
+	// differentCert is a self-signed certificate with CN=test.local, valid until 2125-12-27.
+	// Used to test scenarios where the serving cert has an incorrect common name.
 	differentCert = `-----BEGIN CERTIFICATE-----
-MIIB6zCCAZGgAwIBAgIUNukOeYC/OJTuAHe8x0dZGxo/UPcwCgYIKoZIzj0EAwIw
-SDELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAkNBMRYwFAYDVQQHEw1TYW4gRnJhbmNp
-c2NvMRQwEgYDVQQDEwtleGFtcGxlLm5ldDAeFw0yMDExMTkxMjU1MDBaFw0yNTEx
-MTgxMjU1MDBaMEgxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDQTEWMBQGA1UEBxMN
-U2FuIEZyYW5jaXNjbzEUMBIGA1UEAxMLZXhhbXBsZS5uZXQwWTATBgcqhkjOPQIB
-BggqhkjOPQMBBwNCAAStQMOkXCI/byn1MPc5KYM1d5NsPF4gexjeKqjJrrHcaTow
-jJAQOslKXAhHKp0y+jhFzr8lQdDrt5eHUK/LfDpKo1kwVzAOBgNVHQ8BAf8EBAMC
-AQYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUhJoVW5gCXH0QwkspeVOA4EBG
-sBMwFQYDVR0RBA4wDIcEfwAAAYcECgAAATAKBggqhkjOPQQDAgNIADBFAiEAzTu+
-fuo0nJuh1ta+w+X7iwhx29AG/1TAPY/S+tnG4OUCIBvy9g6GCEUbgYgwPKF2k8G3
-zrzrJ5SCjYy4UbElrjNx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 -----END CERTIFICATE-----
 `
 	differentKey = `-----BEGIN EC PRIVATE KEY-----
-MHcCAQEEIFU6aDkXYwx8YYtXd9AZPIst87daWX49Rzhxsd7D7UwroAoGCCqGSM49
-AwEHoUQDQgAErUDDpFwiP28p9TD3OSmDNXeTbDxeIHsY3iqoya6x3Gk6MIyQEDrJ
-SlwIRyqdMvo4Rc6/JUHQ67eXh1Cvy3w6Sg==
+MHcCAQEEICFHW0k1ha6ASzT2MTJmWLhBVaSPK7F5m5HRQTVORJVtoAoGCCqGSM49
+AwEHoUQDQgAE1HEXRXELYUrJzS0aXZERGiiEfCpoE3NmLyiSeei9gidY/Di/XWEl
+jypTtAfFeztBB3HccSL5PAPpL0ovuJr9RA==
 -----END EC PRIVATE KEY-----
 `
 )