diff --git a/tests/suites/test_suite_pkwrite.data b/tests/suites/test_suite_pkwrite.data
index 81cae972df..4199ff2646 100644
--- a/tests/suites/test_suite_pkwrite.data
+++ b/tests/suites/test_suite_pkwrite.data
@@ -42,10 +42,18 @@ Public key write check EC X25519
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
 pk_write_pubkey_check:"data_files/ec_x25519_pub.pem":TEST_PEM
 
+Public key write check EC X25519 (DER)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_write_pubkey_check:"data_files/ec_x25519_pub.der":TEST_DER
+
 Public key write check EC X448
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
 pk_write_pubkey_check:"data_files/ec_x448_pub.pem":TEST_PEM
 
+Public key write check EC X448 (DER)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_write_pubkey_check:"data_files/ec_x448_pub.der":TEST_DER
+
 Private key write check RSA
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PEM_PARSE_C:MBEDTLS_PEM_WRITE_C
 pk_write_key_check:"data_files/server1.key":TEST_PEM
@@ -106,10 +114,18 @@ Private key write check EC X25519
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
 pk_write_key_check:"data_files/ec_x25519_prv.pem":TEST_PEM
 
+Private key write check EC X25519 (DER)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_write_key_check:"data_files/ec_x25519_prv.der":TEST_DER
+
 Private key write check EC X448
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
 pk_write_key_check:"data_files/ec_x448_prv.pem":TEST_PEM
 
+Private key write check EC X448 (DER)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_write_key_check:"data_files/ec_x448_prv.der":TEST_DER
+
 Derive public key RSA
 depends_on:MBEDTLS_RSA_C
 pk_write_public_from_private:"data_files/server1.key.der":"data_files/server1.pubkey.der"