diff --git a/test/simpleshop_theme/settings_test.exs b/test/simpleshop_theme/settings_test.exs
index 10ecb2c..98a8efe 100644
--- a/test/simpleshop_theme/settings_test.exs
+++ b/test/simpleshop_theme/settings_test.exs
@@ -63,6 +63,31 @@ defmodule SimpleshopTheme.SettingsTest do
       assert settings.typography == "editorial"
     end
 
+    test "regenerates CSS cache when settings change" do
+      alias SimpleshopTheme.Theme.CSSCache
+
+      # Get initial cached CSS
+      {:ok, initial_css} = CSSCache.get()
+      assert initial_css =~ ".themed {"
+
+      # Update to a different accent color
+      {:ok, _settings} = Settings.update_theme_settings(%{accent_color: "#ff0000"})
+
+      # Cache should now contain new CSS with the red accent color
+      {:ok, updated_css} = CSSCache.get()
+      assert updated_css =~ ".themed {"
+      assert updated_css =~ "--t-accent-h: 0"  # Red = hue 0
+
+      # Change to blue
+      {:ok, _settings} = Settings.update_theme_settings(%{accent_color: "#0000ff"})
+
+      {:ok, blue_css} = CSSCache.get()
+      assert blue_css =~ "--t-accent-h: 240"  # Blue = hue 240
+
+      # Restore default
+      CSSCache.warm()
+    end
+
     test "validates mood values" do
       {:error, changeset} = Settings.update_theme_settings(%{mood: "invalid"})
       assert "is invalid" in errors_on(changeset).mood