Move logic to render HTML and text content to dedicated methods, fixing #21.

django_pony_express/services/base.py

@@ -230,6 +230,19 @@ def _add_attachments(self, msg: EmailMultiAlternatives):
 
         return msg
 
+    def _generate_html_content(self, mail_attributes: dict) -> str:
+        return render_to_string(self.template_name, mail_attributes)
+
+    def _generate_text_content(self, mail_attributes: dict, html_content: str) -> str:
+        # Render TXT body part if a template is explicitly set, otherwise convert HTML template to plain text
+        if not self.template_txt_name:
+            h = html2text.HTML2Text()
+            # Set body width to "infinite" to avoid weird line breaks
+            h.body_width = 0
+            return h.handle(html_content)
+        else:
+            return render_to_string(self.template_txt_name, mail_attributes)
+
     def _build_mail_object(self) -> EmailMultiAlternatives:
         """
         This method creates a mail object. It collects the required variables, sets the subject and makes sure that
@@ -245,16 +258,8 @@ def _build_mail_object(self) -> EmailMultiAlternatives:
         mail_attributes = self.get_context_data()
 
         # Render HTML body content
-        html_content = render_to_string(self.template_name, mail_attributes)
-
-        # Render TXT body part if a template is explicitly set, otherwise convert HTML template to plain text
-        if not self.template_txt_name:
-            h = html2text.HTML2Text()
-            # Set body width to "infinite" to avoid weird line breaks
-            h.body_width = 0
-            text_content = h.handle(html_content)
-        else:
-            text_content = render_to_string(self.template_txt_name, mail_attributes)
+        html_content = self._generate_html_content(mail_attributes)
+        text_content = self._generate_text_content(mail_attributes, html_content)
 
         # Build mail object
         msg = EmailMultiAlternatives(

tests/services/base/test_base_mail_service.py

@@ -406,3 +406,40 @@ def test_process_with_error(self):
     def test_process_is_valid_invalid(self, *args):
         factory = BaseEmailService()
         self.assertEqual(factory.process(), 0)
+
+    def test_html_templates_rendering(self):
+        my_var = "Lorem ipsum dolor!"
+        service = BaseEmailService()
+        service.template_name = "testapp/test_email.html"
+        msg_html = service._generate_html_content({"my_var": my_var})
+
+        # Assertions
+        self.assertIsInstance(msg_html, str)
+
+        self.assertIn("Lorem ipsum dolor", msg_html)
+        self.assertNotIn("I am a different content", msg_html)
+
+    def test_text_templates_rendering(self):
+        my_var = "Lorem ipsum dolor!"
+        service = BaseEmailService()
+        service.template_txt_name = "testapp/test_email.txt"
+        msg_html = service._generate_text_content({"my_var": my_var}, "")
+
+        # Assertions
+        self.assertIsInstance(msg_html, str)
+
+        self.assertIn("Lorem ipsum dolor", msg_html)
+        self.assertIn("I am a different content", msg_html)
+        self.assertNotIn("Current date test", msg_html)
+
+    def test_text_templates_rendering_fallback(self):
+        my_var = "Lorem ipsum dolor!"
+        service = BaseEmailService()
+        msg_html = service._generate_text_content({"my_var": my_var}, "Lorem ipsum dolor")
+
+        # Assertions
+        self.assertIsInstance(msg_html, str)
+
+        self.assertIn("Lorem ipsum dolor", msg_html)
+        self.assertNotIn("I am a different content", msg_html)
+        self.assertNotIn("Current date test", msg_html)