add basic delta chat tests

online-tests/test_deltachat.py

@@ -0,0 +1,13 @@
+
+
+class TestMailSending:
+    def test_one_on_one(self, cmfactory, lp):
+        ac1, ac2 = cmfactory.get_online_accounts(2)
+        chat = cmfactory.get_accepted_chat(ac1, ac2)
+
+        lp.sec("ac1: prepare and send text message to ac2")
+        msg1 = chat.send_text("message0")
+
+        lp.sec("wait for ac2 to receive message")
+        msg2 = ac2._evtracker.wait_next_incoming_message()
+        assert msg2.text == "message0"