diff --git a/lemarche/www/conversations/tests.py b/lemarche/www/conversations/tests.py
new file mode 100644
index 000000000..578e4cb92
--- /dev/null
+++ b/lemarche/www/conversations/tests.py
@@ -0,0 +1,38 @@
+from unittest import mock
+
+from django.test import TestCase
+
+from lemarche.conversations.factories import ConversationFactory
+from lemarche.siaes.factories import SiaeFactory
+from lemarche.users.factories import UserFactory
+from lemarche.www.conversations.tasks import send_first_email_from_conversation
+
+
+class TestConversationTasks(TestCase):
+    def test_send_first_email_from_conversation(self):
+        conversation = ConversationFactory()
+
+        with mock.patch("lemarche.www.conversations.tasks.send_mail_async") as mock_send_mail_async:
+            send_first_email_from_conversation(conversation)
+
+        mock_send_mail_async.assert_called_once()
+        email_body = mock_send_mail_async.call_args[1]["email_body"]
+        self.assertTrue(f"{conversation.sender_first_name} {conversation.sender_last_name}" in email_body)
+        self.assertTrue("Ce client vous a contacté via le Marché de l'inclusion." in email_body)
+
+        # conversation with authenticated user
+        user = UserFactory()
+        siae_with_user = SiaeFactory()
+        siae_with_user.users.add(user)
+
+        conversation_with_user = ConversationFactory(sender_user=user)
+        with mock.patch("lemarche.www.conversations.tasks.send_mail_async") as mock_send_mail_async:
+            send_first_email_from_conversation(conversation_with_user)
+
+        mock_send_mail_async.assert_called_once()
+        email_body = mock_send_mail_async.call_args[1]["email_body"]
+        self.assertTrue(
+            f"{conversation_with_user.sender_first_name} {conversation_with_user.sender_last_name}" in email_body
+        )
+        self.assertTrue(siae_with_user.name in email_body)
+        self.assertTrue("Ce client vous a contacté via le Marché de l'inclusion." in email_body)