diff -ru a/test/test_client.c b/test/test_client.c
--- a/test/test_client.c	2022-01-29 20:52:43.000000000 +0300
+++ b/test/test_client.c	2023-06-28 03:11:52.567358498 +0300
@@ -541,7 +541,7 @@
 
   axc_buf * pt_buf_p;
   assert_int_equal(axc_pre_key_message_process(ct_buf_p, &addr_alice, ctx_b_p, &pt_buf_p), 0);
-  assert_string_equal(axc_buf_get_data(pt_buf_p), "hello");
+  assert_string_equal((char const *)axc_buf_get_data(pt_buf_p), "hello");
   assert_memory_equal(axc_buf_get_data(msg_buf_p), axc_buf_get_data(pt_buf_p), axc_buf_get_len(msg_buf_p));
   assert_int_equal(axc_session_exists_initiated(&addr_alice, ctx_b_p), 1);
 
diff -ru a/test/test_store.c b/test/test_store.c
--- a/test/test_store.c	2022-01-29 20:52:43.000000000 +0300
+++ b/test/test_store.c	2023-06-28 03:21:09.631802550 +0300
@@ -17,11 +17,11 @@
 #include "../src/axc.c"
 #include "../src/axc_store.c"
 
-sqlite3 * db_p;
-sqlite3_stmt * pstmt_p;
+sqlite3 * db_p = NULL;
+sqlite3_stmt * pstmt_p = NULL;
 
 char * db_filename = "test/test.sqlite";
-axc_context * ctx_global_p;
+axc_context * ctx_global_p = NULL;
 
 signal_protocol_address addr_alice_42 = {.name = "alice", .name_len = 5, .device_id = 42};
 signal_protocol_address addr_alice_21 = {.name = "alice", .name_len = 5, .device_id = 21};
@@ -145,24 +145,24 @@
   assert_int_equal(db_conn_open(&db_p, &pstmt_p, stmt, ctx_global_p), 0);
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "name");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "TEXT");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "name");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "TEXT");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "name_len");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "name_len");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "device_id");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "device_id");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "session_record");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "BLOB");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "session_record");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "BLOB");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "record_len");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "record_len");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_DONE);
   assert_int_equal(sqlite3_finalize(pstmt_p), SQLITE_OK);
@@ -171,16 +171,16 @@
   assert_int_equal(sqlite3_prepare_v2(db_p, stmt, -1, &pstmt_p, (void *) 0), SQLITE_OK);
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "id");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "id");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "pre_key_record");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "BLOB");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "pre_key_record");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "BLOB");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "record_len");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "record_len");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_DONE);
   assert_int_equal(sqlite3_finalize(pstmt_p), SQLITE_OK);
@@ -189,16 +189,16 @@
   assert_int_equal(sqlite3_prepare_v2(db_p, stmt, -1, &pstmt_p, (void *) 0), SQLITE_OK);
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "id");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "id");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "signed_pre_key_record");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "BLOB");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "signed_pre_key_record");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "BLOB");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "record_len");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "record_len");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_DONE);
   assert_int_equal(sqlite3_finalize(pstmt_p), SQLITE_OK);
@@ -207,20 +207,20 @@
   assert_int_equal(sqlite3_prepare_v2(db_p, stmt, -1, &pstmt_p, (void *) 0), SQLITE_OK);
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "name");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "TEXT");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "name");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "TEXT");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "key");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "BLOB");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "key");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "BLOB");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "key_len");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "key_len");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "trusted");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "trusted");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_DONE);
   assert_int_equal(sqlite3_finalize(pstmt_p), SQLITE_OK);
@@ -229,12 +229,12 @@
   assert_int_equal(sqlite3_prepare_v2(db_p, stmt, -1, &pstmt_p, (void *) 0), SQLITE_OK);
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "name");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "TEXT");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "name");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "TEXT");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 1), "property");
-  assert_string_equal(sqlite3_column_text(pstmt_p, 2), "INTEGER");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 1), "property");
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 2), "INTEGER");
 
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_DONE);
 }
@@ -335,7 +335,7 @@
 
   assert_int_equal(db_conn_open(&db_p, &pstmt_p, "SELECT * FROM session_store WHERE name='alice' AND device_id IS 42;", ctx_global_p), 0);
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 0), addr_alice_42.name);
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 0), addr_alice_42.name);
   assert_int_equal(sqlite3_column_int(pstmt_p, 1), strlen(addr_alice_42.name));
   assert_int_equal(sqlite3_column_int(pstmt_p, 2), addr_alice_42.device_id);
   assert_memory_equal(sqlite3_column_blob(pstmt_p, 3), bytes_1, bytes_1_len);
@@ -405,7 +405,7 @@
   assert_int_equal(axc_db_session_contains(&addr_alice, ctx_b_p), 0);
   assert_int_equal(axc_db_session_contains(&addr_bob, ctx_a_p), 0);
 
-  axc_bundle * bundle_bob_p;
+  axc_bundle * bundle_bob_p = NULL;
   assert_int_equal(axc_bundle_collect(AXC_PRE_KEYS_AMOUNT, ctx_b_p, &bundle_bob_p), 0);
   addr_bob.device_id = bundle_bob_p->registration_id;
 
@@ -423,7 +423,7 @@
   axc_buf * msg_buf_p = axc_buf_create((uint8_t *)data, strlen(data) + 1);
   assert_ptr_not_equal(msg_buf_p, (void *) 0);
 
-  axc_buf * ct_buf_p;
+  axc_buf * ct_buf_p = NULL;
   assert_int_equal(axc_message_encrypt_and_serialize(msg_buf_p, &addr_bob, ctx_a_p, &ct_buf_p), 0);
 
   uint32_t alice_id;
@@ -431,7 +431,7 @@
 
   addr_alice.device_id = alice_id;
 
-  axc_buf * pt_buf_p;
+  axc_buf * pt_buf_p = NULL;
   assert_int_equal(axc_pre_key_message_process(ct_buf_p, &addr_alice, ctx_b_p, &pt_buf_p), 0);
 
   assert_int_equal(axc_session_exists_initiated(&addr_bob, ctx_a_p), 1);
@@ -713,7 +713,7 @@
 
   assert_int_equal(db_conn_open(&db_p, &pstmt_p, stmt, ctx_global_p), 0);
   assert_int_equal(sqlite3_step(pstmt_p), SQLITE_ROW);
-  assert_string_equal(sqlite3_column_text(pstmt_p, 0), addr_alice_21.name);
+  assert_string_equal((char const *)sqlite3_column_text(pstmt_p, 0), addr_alice_21.name);
   assert_memory_equal(sqlite3_column_blob(pstmt_p, 1), bytes_1, bytes_1_len);
   assert_int_equal(sqlite3_column_int(pstmt_p, 2), bytes_1_len);
   assert_int_equal(sqlite3_column_int(pstmt_p, 3), IDENTITY_KEY_TRUSTED);