diff --git a/src/neofs_testlib/utils/wallet.py b/src/neofs_testlib/utils/wallet.py
index 656c41f..9cd248b 100644
--- a/src/neofs_testlib/utils/wallet.py
+++ b/src/neofs_testlib/utils/wallet.py
@@ -34,4 +34,4 @@ def get_last_address_from_wallet(wallet_path: str, wallet_password: str):
         wallet = neo3_wallet.Wallet.from_json(json.load(wallet_file), password=wallet_password)
     address = wallet.accounts[-1].address
     logger.info(f"got address: {address}")
-    return address
\ No newline at end of file
+    return address
diff --git a/tests/test_ulils.py b/tests/test_ulils.py
new file mode 100644
index 0000000..50cf5fc
--- /dev/null
+++ b/tests/test_ulils.py
@@ -0,0 +1,74 @@
+import json
+import os
+from unittest import TestCase
+from uuid import uuid4
+
+from neo3 import wallet as neo3_wallet
+
+from neofs_testlib.utils import converters, wallet
+
+
+class TestUtils(TestCase):
+    def test_converters_str_to_ascii_hex(self):
+        source_str = ""
+        result_str = ""
+        self.assertEqual(converters.str_to_ascii_hex(source_str), result_str)
+
+        source_str = '"test_data" f0r ^convert*'
+        result_str = "22746573745f646174612220663072205e636f6e766572742a"
+        self.assertEqual(converters.str_to_ascii_hex(source_str), result_str)
+
+        source_str = ""
+        result_bytes = b""
+        self.assertEqual(converters.ascii_hex_to_str(source_str), result_bytes)
+
+        source_str = "22746573745f646174612220663072205e636f6e766572742a"
+        result_bytes = b'"test_data" f0r ^convert*'
+        self.assertEqual(converters.ascii_hex_to_str(source_str), result_bytes)
+
+    def test_process_b64_bytearray_reverse(self):
+        source_str = ""
+        result_bytes = b""
+        self.assertEqual(converters.process_b64_bytearray_reverse(source_str), result_bytes)
+
+        source_str = "InRlc3RfZGF0YSIgZjByIF5jb252ZXJ0Kg=="
+        result_bytes = b"2a747265766e6f635e207230662022617461645f7473657422"
+        self.assertEqual(converters.process_b64_bytearray_reverse(source_str), result_bytes)
+
+    def test_process_b64_bytearray(self):
+        source_str = ""
+        result_bytes = b""
+        self.assertEqual(converters.process_b64_bytearray(source_str), result_bytes)
+
+        source_str = "InRlc3RfZGF0YSIgZjByIF5jb252ZXJ0Kg=="
+        result_bytes = b"22746573745f646174612220663072205e636f6e766572742a"
+        self.assertEqual(converters.process_b64_bytearray(source_str), result_bytes)
+
+    def test_contract_hash_to_address(self):
+        source_str = "d01a381aae45f1ed181db9d554cc5ccc69c69f4e"
+        result_str = "NT5hJ5peVmvYdZCsFKUM5MTcEGw5TB4k89"
+        self.assertEqual(converters.contract_hash_to_address(source_str), result_str)
+
+    def test_init_wallet(self):
+        wallet_file_path = f"{str(uuid4())}.json"
+        for password in ("", "password"):
+            wrong_password = "wrong_password"
+            wallet.init_wallet(wallet_file_path, password)
+            self.assertTrue(os.path.exists(wallet_file_path))
+            with open(wallet_file_path, "r") as wallet_file:
+                neo3_wallet.Wallet.from_json(json.load(wallet_file), password=password)
+            with self.assertRaises(Exception):
+                neo3_wallet.Wallet.from_json(json.load(wallet_file), password=wrong_password)
+            os.unlink(wallet_file_path)
+
+    def test_get_last_address_from_wallet(self):
+        wallet_file_path = f"{str(uuid4())}.json"
+        for password in ("", "password"):
+            wallet.init_wallet(wallet_file_path, password)
+            with open(wallet_file_path, "r") as wallet_file:
+                wlt = neo3_wallet.Wallet.from_json(json.load(wallet_file), password=password)
+            last_address = wlt.accounts[-1].address
+            self.assertEqual(
+                wallet.get_last_address_from_wallet(wallet_file_path, password), last_address
+            )
+            os.unlink(wallet_file_path)