diff --git a/tests/test_arg_opts.py b/tests/test_arg_opts.py
new file mode 100644
index 0000000..f0ecf7d
--- /dev/null
+++ b/tests/test_arg_opts.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import sys
+import pytest
+from src import boot
+
+
+@pytest.fixture(autouse=True)
+def argv_cleanup():
+    """
+    Clean up the command line arguments before each test.
+    """
+    boot.init_opts()
+    argv_backup = sys.argv
+    sys.argv = ['syncplay']
+    yield
+    sys.argv = argv_backup
+
+
+def test_args_empty():
+    """
+    Test command line arguments in the empty case.
+    """
+    options = boot.load_from_args()
+    assert isinstance(options, dict) and not options
+
+
+@pytest.mark.parametrize(
+    'name, arg_tag',
+    [
+        ('port', '--port'),
+        ('max_username', '--max-username'),
+        ('max_chat_message', '--max-chat-message'),
+    ],
+)
+def test_args_single_int(name: str, arg_tag: str):
+    """
+    Test command line arguments for single integer option.
+    """
+    sys.argv += [arg_tag, '0']
+    assert boot.load_from_args() == {name: 0}
+
+    sys.argv += [arg_tag, '42']
+    assert boot.load_from_args() == {name: 42}
+
+
+@pytest.mark.parametrize(
+    'name, arg_tag',
+    [
+        ('config', '--config'),
+        ('password', '--password'),
+        ('motd', '--motd'),
+        ('salt', '--salt'),
+        ('listen_ipv4', '--listen-ipv4'),
+        ('listen_ipv6', '--listen-ipv6'),
+    ],
+)
+def test_args_single_str(name: str, arg_tag: str):
+    """
+    Test command line arguments for single string option.
+    """
+    sys.argv += [arg_tag, '']
+    assert boot.load_from_args() == {name: ''}
+
+    sys.argv += [arg_tag, 'TeSt \n0123456789\t']
+    assert boot.load_from_args() == {name: 'TeSt \n0123456789\t'}
+
+
+@pytest.mark.parametrize(
+    'name, arg_tag',
+    [
+        ('random_salt', '--random-salt'),
+        ('isolate_rooms', '--isolate-rooms'),
+        ('disable_chat', '--disable-chat'),
+        ('disable_ready', '--disable-ready'),
+        ('enable_stats', '--enable-stats'),
+        ('enable_tls', '--enable-tls'),
+        ('persistent', '--persistent'),
+    ],
+)
+def test_args_single_bool(name: str, arg_tag: str):
+    """
+    Test command line arguments for single boolean option.
+    """
+    sys.argv += [arg_tag]
+    assert boot.load_from_args() == {name: True}
+
+
+def test_args_full():
+    """
+    Test all command line arguments options.
+    """
+    # fmt: off
+    sys.argv += [
+        '--config', 'config.yml',
+        '--port', '8999',
+        '--password', 'PASSWD',
+        '--motd', 'MESSAGE',
+        '--salt', 'SALT',
+        '--random-salt',
+        '--isolate-rooms',
+        '--disable-chat',
+        '--disable-ready',
+        '--enable-stats',
+        '--enable-tls',
+        '--persistent',
+        '--max-username', '120',
+        '--max-chat-message', '240',
+        '--listen-ipv4', '127.0.0.1',
+        '--listen-ipv6', '::1',
+    ]  # fmt: on
+    excepted_opts = {
+        'config': 'config.yml',
+        'port': 8999,
+        'password': 'PASSWD',
+        'motd': 'MESSAGE',
+        'salt': 'SALT',
+        'random_salt': True,
+        'isolate_rooms': True,
+        'disable_chat': True,
+        'disable_ready': True,
+        'enable_stats': True,
+        'enable_tls': True,
+        'persistent': True,
+        'max_username': 120,
+        'max_chat_message': 240,
+        'listen_ipv4': '127.0.0.1',
+        'listen_ipv6': '::1',
+    }
+    assert boot.load_from_args() == excepted_opts
diff --git a/tests/test_env_opts.py b/tests/test_env_opts.py
index 8e6e824..d016d43 100644
--- a/tests/test_env_opts.py
+++ b/tests/test_env_opts.py
@@ -36,7 +36,7 @@ def test_env_empty():
         ('max_chat_message', 'MAX_CHAT_MESSAGE'),
     ],
 )
-def test_env_int(name: str, env_tag: str):
+def test_env_single_int(name: str, env_tag: str):
     """
     Test environment variables for single integer option.
     """
@@ -58,7 +58,7 @@ def test_env_int(name: str, env_tag: str):
         ('listen_ipv6', 'LISTEN_IPV6'),
     ],
 )
-def test_env_str(name: str, env_tag: str):
+def test_env_single_str(name: str, env_tag: str):
     """
     Test environment variables for single string option.
     """
@@ -81,7 +81,7 @@ def test_env_str(name: str, env_tag: str):
         ('persistent', 'PERSISTENT'),
     ],
 )
-def test_env_bool(name: str, env_tag: str):
+def test_env_single_bool(name: str, env_tag: str):
     """
     Test environment variables for single boolean option.
     """