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

tests/formatters/tests_command_formatter.py

@@ -0,0 +1,17 @@
+from unittest import TestCase
+from bs4 import BeautifulSoup
+from html_to_django.formatters import command_formatter
+
+
+class CommandTests(TestCase):
+    def test_basic(self) -> None:
+        soup = BeautifulSoup('<div dj-command="command_name"></div>', "html.parser")
+        command_formatter.format(soup)
+        expected_result = "{% command_name %}"
+        self.assertEqual(expected_result, str(soup))
+
+    def test_with_content(self) -> None:
+        soup = BeautifulSoup('<div dj-command="command_name">Test</div>', "html.parser")
+        command_formatter.format(soup)
+        expected_result = "{% command_name %}"
+        self.assertEqual(expected_result, str(soup))