internal/server: fix dropped testing error (#3015)

internal/server/testing.go

@@ -64,6 +64,7 @@ func TestRootCertificate(ctx context.Context, t *testing.T, conn *db.DB, kmsKey
 
 	cert, err := newRootCertificate(ctx, mathRand.Uint64(), populateBytes(defaultLength), beforeTimestamp, afterTimestamp,
 		rootCertKeys, kmsKey, CurrentState)
+	require.NoError(t, err)
 	err = rw.Create(ctx, cert)
 	require.NoError(t, err)
 	return cert