added tests for all formatters; stylecheck workflow now also checks in tests now

tests/formatters/tests_static_formatter.py

@@ -0,0 +1,17 @@
+from unittest import TestCase
+from bs4 import BeautifulSoup
+from html_to_django.formatters import static_formatter
+
+
+class StaticTests(TestCase):
+    def test_basic(self) -> None:
+        soup = BeautifulSoup('<img dj-static="src;image.png"/>', "html.parser")
+        static_formatter.format(soup)
+        expected_result = '<img src="{% static \'image.png\' %}"/>'
+        self.assertEqual(expected_result, str(soup))
+
+    def test_with_content(self) -> None:
+        soup = BeautifulSoup('<div dj-static="background;image.png">Test</div>', "html.parser")
+        static_formatter.format(soup)
+        expected_result = '<div background="{% static \'image.png\' %}">Test</div>'
+        self.assertEqual(expected_result, str(soup))