diff --git a/tests/api/test_evp.c b/tests/api/test_evp.c
index a2dfb2841..b41293a8c 100644
--- a/tests/api/test_evp.c
+++ b/tests/api/test_evp.c
@@ -29,9 +29,19 @@
 
 #include <tests/unit.h>
 #include <wolfssl/openssl/evp.h>
+#include <tests/api/test_evp.h>
 
 #ifdef OPENSSL_EXTRA
 
+/* Test for NULL_CIPHER_TYPE in wolfSSL_EVP_CipherUpdate() */
+static int TestNullCipherUpdate(void);
+/* Test for NULL_CIPHER_TYPE with empty data */
+static int TestNullCipherUpdateEmptyData(void);
+/* Test for NULL_CIPHER_TYPE with large data */
+static int TestNullCipherUpdateLargeData(void);
+/* Test for NULL_CIPHER_TYPE with multiple updates */
+static int TestNullCipherUpdateMultiple(void);
+
 /* Test for NULL_CIPHER_TYPE in wolfSSL_EVP_CipherUpdate() */
 static int TestNullCipherUpdate(void)
 {
diff --git a/tests/api/test_evp.h b/tests/api/test_evp.h
index 90750cbe3..dce6b3330 100644
--- a/tests/api/test_evp.h
+++ b/tests/api/test_evp.h
@@ -23,6 +23,7 @@
 #define WOLFSSL_TEST_EVP_H
 
 #ifdef OPENSSL_EXTRA
+/* Function to register all EVP tests */
 int TestEvpAll(void);
 #endif /* OPENSSL_EXTRA */