"""Placeholder tests for VPN Monitor.

This module contains placeholder tests to verify the test infrastructure
is working correctly. Replace these with actual unit tests as the project
develops.
"""

import pytest


class TestPlaceholder:
    """Placeholder test class to verify pytest setup."""

    def test_placeholder_passes(self):
        """Verify that the test infrastructure is working."""
        assert True

    def test_addition(self):
        """Simple arithmetic test to verify pytest execution."""
        assert 1 + 1 == 2

    @pytest.mark.parametrize(
        "input_value,expected",
        [
            (1, 1),
            (2, 4),
            (3, 9),
            (4, 16),
        ],
    )
    def test_square(self, input_value, expected):
        """Parametrized test example."""
        assert input_value**2 == expected


class TestImports:
    """Verify that project modules can be imported."""

    def test_import_vpn_monitor(self):
        """Verify vpn_monitor package can be imported."""
        try:
            import vpn_monitor

            assert vpn_monitor is not None
        except ImportError as e:
            pytest.skip(f"Could not import vpn_monitor: {e}")

    def test_import_monitor_module(self):
        """Verify monitor module can be imported."""
        try:
            from vpn_monitor import monitor

            assert monitor is not None
        except ImportError as e:
            pytest.skip(f"Could not import monitor: {e}")

    def test_import_gui_module(self):
        """Verify gui module can be imported."""
        try:
            from vpn_monitor import gui

            assert gui is not None
        except ImportError as e:
            pytest.skip(f"Could not import gui: {e}")

    def test_import_tray_module(self):
        """Verify tray module can be imported."""
        try:
            from vpn_monitor import tray

            assert tray is not None
        except ImportError as e:
            pytest.skip(f"Could not import tray: {e}")


# TODO: Add actual unit tests for:
# - monitor.py: Process detection, region checking
# - gui.py: Warning window display
# - tray.py: System tray functionality
# - main.py: CLI argument parsing, startup integration
