Add test

docs/settings.rst

@@ -34,7 +34,7 @@ The ``BOOTSTRAP5`` dict variable contains these settings and defaults:
         # The complete URL to the Bootstrap CSS theme file (None means no theme).
         "theme_url": None,
 
-        # Theme color: light, dark https://getbootstrap.com/docs/5.3/customize/color-modes/
+        # Color mode (None means do not set color mode).
         "color_mode": None,
 
         # Put JavaScript in the HEAD section of the HTML document (only relevant if you use bootstrap5.html).

tests/test_templates.py

@@ -8,6 +8,19 @@ def test_empty_template(self):
     def test_text_template(self):
         self.assertEqual(self.render("some text").strip(), "some text")
 
+    def test_bootstrap5_html_template_color_mode(self):
+        html = self.render(
+            '{% extends "django_bootstrap5/bootstrap5.html" %}',
+            load_bootstrap=False,
+        )
+        self.assertNotIn("data-bs-theme", html)
+        with self.settings(BOOTSTRAP5={"color_mode": "dark"}):
+            html = self.render(
+                '{% extends "django_bootstrap5/bootstrap5.html" %}',
+                load_bootstrap=False,
+            )
+            self.assertIn('data-bs-theme="dark"', html)
+
     def test_bootstrap5_html_template_title(self):
         html = self.render(
             '{% extends "django_bootstrap5/bootstrap5.html" %}{% block bootstrap5_title %}x-title-x{% endblock %}',