diff --git a/tests/test_theme_nerv_fx.py b/tests/test_theme_nerv_fx.py
new file mode 100644
index 0000000..ea3bf6a
--- /dev/null
+++ b/tests/test_theme_nerv_fx.py
@@ -0,0 +1,56 @@
+import unittest
+from unittest.mock import MagicMock, patch
+import math
+from src.theme_nerv_fx import ScanlineOverlay, StatusFlicker
+
+class TestThemeNervFx(unittest.TestCase):
+ @patch("src.theme_nerv_fx.imgui")
+ def test_scanline_overlay_render(self, mock_imgui):
+  # Setup
+  mock_draw_list = MagicMock()
+  mock_imgui.get_foreground_draw_list.return_value = mock_draw_list
+  mock_imgui.get_color_u32.return_value = 0x12345678
+  
+  overlay = ScanlineOverlay()
+  width, height = 100.0, 10.0
+  
+  # Act
+  overlay.render(width, height)
+  
+  # Assert
+  mock_imgui.get_foreground_draw_list.assert_called_once()
+  # height is 10, range(0, 10, 2) is [0, 2, 4, 6, 8] -> 5 calls
+  self.assertEqual(mock_draw_list.add_line.call_count, 5)
+  
+  # Verify some calls
+  mock_draw_list.add_line.assert_any_call((0.0, 0.0), (100.0, 0.0), 0x12345678, 1.0)
+  mock_draw_list.add_line.assert_any_call((0.0, 8.0), (100.0, 8.0), 0x12345678, 1.0)
+
+ @patch("src.theme_nerv_fx.time")
+ def test_status_flicker_get_alpha(self, mock_time):
+  flicker = StatusFlicker()
+  
+  # Test at multiple points in time to ensure range [0.7, 1.0]
+  # sin(0) = 0 -> 0.85
+  mock_time.time.return_value = 0.0
+  self.assertAlmostEqual(flicker.get_alpha(), 0.85)
+  
+  # sin(pi/2) = 1 -> 1.0
+  # time * 20.0 = pi/2 -> time = pi/40
+  mock_time.time.return_value = math.pi / 40.0
+  self.assertAlmostEqual(flicker.get_alpha(), 1.0)
+  
+  # sin(3pi/2) = -1 -> 0.7
+  # time * 20.0 = 3pi/2 -> time = 3pi/40
+  mock_time.time.return_value = 3 * math.pi / 40.0
+  self.assertAlmostEqual(flicker.get_alpha(), 0.7)
+  
+  # Verify range for many samples
+  for i in range(100):
+   mock_time.time.return_value = i * 0.1
+   alpha = flicker.get_alpha()
+   self.assertGreaterEqual(alpha, 0.7)
+   self.assertLessEqual(alpha, 1.0)
+
+if __name__ == "__main__":
+ unittest.main()