diff --git a/tests/suites/test_suite_ctr_drbg.function b/tests/suites/test_suite_ctr_drbg.function
index 7d81608..c689699 100644
--- a/tests/suites/test_suite_ctr_drbg.function
+++ b/tests/suites/test_suite_ctr_drbg.function
@@ -31,15 +31,13 @@
                                        data_t *result)
 {
     mbedtls_ctr_drbg_context ctx;
+    mbedtls_ctr_drbg_init(&ctx);
     unsigned char buf[64];
 
     size_t entropy_chunk_len = (size_t) entropy_len_arg;
-
     TEST_ASSERT(entropy_chunk_len <= sizeof(buf));
 
     test_offset_idx = 0;
-    mbedtls_ctr_drbg_init(&ctx);
-
     test_max_idx = entropy->len;
 
     /* CTR_DRBG_Instantiate(entropy[:entropy->len], nonce, perso, <ignored>)
diff --git a/tests/suites/test_suite_pkwrite.function b/tests/suites/test_suite_pkwrite.function
index 730bb88..733909e 100644
--- a/tests/suites/test_suite_pkwrite.function
+++ b/tests/suites/test_suite_pkwrite.function
@@ -68,6 +68,7 @@
 static void pk_write_check_common(char *key_file, int is_public_key, int is_der)
 {
     mbedtls_pk_context key;
+    mbedtls_pk_init(&key);
     unsigned char *buf = NULL;
     unsigned char *check_buf = NULL;
     unsigned char *start_buf;
@@ -78,9 +79,6 @@
 
     USE_PSA_INIT();
 
-    mbedtls_pk_init(&key);
-    USE_PSA_INIT();
-
     /* Note: if mbedtls_pk_load_file() successfully reads the file, then
        it also allocates check_buf, which should be freed on exit */
     TEST_EQUAL(mbedtls_pk_load_file(key_file, &check_buf, &check_buf_len), 0);
diff --git a/tests/suites/test_suite_psa_crypto_se_driver_hal.function b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
index 9c5ef23..8e96984 100644
--- a/tests/suites/test_suite_psa_crypto_se_driver_hal.function
+++ b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
@@ -1297,7 +1297,7 @@
     mbedtls_svc_key_id_t returned_id;
     mbedtls_svc_key_id_t sw_key = MBEDTLS_SVC_KEY_ID_INIT;
     psa_key_attributes_t sw_attributes = PSA_KEY_ATTRIBUTES_INIT;
-    psa_key_attributes_t drv_attributes;
+    psa_key_attributes_t drv_attributes = PSA_KEY_ATTRIBUTES_INIT;
     uint8_t signature[PSA_SIGNATURE_MAX_SIZE];
     size_t signature_length;
 
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index eb2407d..8a837bb 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -24,6 +24,7 @@
 {
     enum { MSGLEN = 10 };
     mbedtls_test_ssl_buffer buf;
+    mbedtls_test_ssl_buffer_init(&buf);
     unsigned char input[MSGLEN];
     unsigned char output[MSGLEN];
 
@@ -43,8 +44,6 @@
 
     /* Make sure calling put and get on a buffer that hasn't been set up results
      * in error. */
-    mbedtls_test_ssl_buffer_init(&buf);
-
     TEST_ASSERT(mbedtls_test_ssl_buffer_put(&buf, input, sizeof(input))
                 == -1);
     TEST_ASSERT(mbedtls_test_ssl_buffer_get(&buf, output, sizeof(output))
@@ -1787,7 +1786,9 @@
 {
     mbedtls_ssl_key_set keys;
     mbedtls_ssl_transform transform_send;
+    mbedtls_ssl_transform_init(&transform_send);
     mbedtls_ssl_transform transform_recv;
+    mbedtls_ssl_transform_init(&transform_recv);
     mbedtls_record rec;
     unsigned char *buf = NULL;
     size_t buf_len;
@@ -1818,8 +1819,6 @@
     keys.key_len = server_write_key->len;
     keys.iv_len  = server_write_iv->len;
 
-    mbedtls_ssl_transform_init(&transform_recv);
-    mbedtls_ssl_transform_init(&transform_send);
     MD_OR_USE_PSA_INIT();
 
     TEST_ASSERT(mbedtls_ssl_tls13_populate_transform(
@@ -3122,6 +3121,7 @@
     mbedtls_psa_stats_t stats;
     size_t free_slots_before = -1;
     mbedtls_test_handshake_test_options options;
+    mbedtls_test_init_handshake_options(&options);
 
     uint16_t iana_tls_group_list[] = { MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1,
                                        MBEDTLS_SSL_IANA_TLS_GROUP_NONE };
@@ -3129,7 +3129,6 @@
     mbedtls_platform_zeroize(&client, sizeof(client));
     mbedtls_platform_zeroize(&server, sizeof(server));
 
-    mbedtls_test_init_handshake_options(&options);
     options.pk_alg = MBEDTLS_PK_ECDSA;
     options.server_min_version = MBEDTLS_SSL_VERSION_TLS1_2;
     options.server_max_version = MBEDTLS_SSL_VERSION_TLS1_2;
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 114bd52..c38a372 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -928,15 +928,17 @@
     int ret = 0, i;
     size_t len = 0, out_size;
     mbedtls_asn1_named_data *names = NULL;
-    mbedtls_x509_name parsed, *parsed_cur;
+    mbedtls_x509_name parsed;
+    memset(&parsed, 0, sizeof(parsed));
+    mbedtls_x509_name *parsed_cur;
     // Size of buf is maximum required for test cases
-    unsigned char buf[80], *out = NULL, *c;
+    unsigned char buf[80] = {0};
+    unsigned char *out = NULL;
+    unsigned char *c = buf + sizeof(buf);
     const char *short_name;
 
     USE_PSA_INIT();
-    memset(&parsed, 0, sizeof(parsed));
-    memset(buf, 0, sizeof(buf));
-    c = buf + sizeof(buf);
+
     // Additional size required for trailing space
     out_size = strlen(expected_oids) + 2;
     TEST_CALLOC(out, out_size);
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index a7ed262..06e0816 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -699,16 +699,16 @@
     int ret;
     size_t len = 0;
     mbedtls_asn1_named_data *names = NULL;
-    mbedtls_x509_name parsed, *parsed_cur, *parsed_prv;
-    unsigned char buf[1024], out[1024], *c;
+    mbedtls_x509_name parsed;
+    memset(&parsed, 0, sizeof(parsed));
+    mbedtls_x509_name *parsed_cur = NULL;
+    mbedtls_x509_name *parsed_prv = NULL;
+    unsigned char buf[1024] = {0};
+    unsigned char out[1024] = {0};
+    unsigned char *c = buf + sizeof(buf);
 
     USE_PSA_INIT();
 
-    memset(&parsed, 0, sizeof(parsed));
-    memset(out, 0, sizeof(out));
-    memset(buf, 0, sizeof(buf));
-    c = buf + sizeof(buf);
-
     ret = mbedtls_x509_string_to_names(&names, name);
     TEST_EQUAL(ret, result);