Add tests

tests/test_size.py

@@ -0,0 +1,26 @@
+from django.test import TestCase
+
+from django_bootstrap5.size import get_size_class, parse_size
+
+
+class SizeTestCase(TestCase):
+    def test_parse_size(self):
+        self.assertEqual(parse_size("sm"), "sm")
+        self.assertEqual(parse_size("md"), "md")
+        self.assertEqual(parse_size("lg"), "lg")
+        with self.assertRaises(ValueError):
+            self.assertEqual(parse_size("xl"), "xl")
+
+    def test_parse_size_default_value(self):
+        for empty_value in ["", None, False]:
+            self.assertEqual(parse_size(empty_value, "sm"), "sm")
+            self.assertEqual(parse_size(empty_value, "md"), "md")
+            self.assertEqual(parse_size(empty_value, "lg"), "lg")
+        with self.assertRaises(ValueError):
+            self.assertEqual(parse_size("", "xl"), "xl")
+
+    def test_get_size_class(self):
+        self.assertEqual(get_size_class("sm", prefix="test"), "test-sm")
+        self.assertEqual(get_size_class("", default="sm", prefix="test"), "test-sm")
+        self.assertEqual(get_size_class("sm", prefix="test", skip="md"), "test-sm")
+        self.assertEqual(get_size_class("sm", prefix="test", skip="sm"), "")