examples: Asio tests consolidation to use loopback interface

Closes IDF-3072


* Original commit: espressif/esp-idf@a06357ab62

examples/protocols/asio/asio_chat/example_test.py

@@ -0,0 +1,29 @@
+# This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+# Unless required by applicable law or agreed to in writing, this
+# software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+# CONDITIONS OF ANY KIND, either express or implied.
+
+# -*- coding: utf-8 -*-
+
+from __future__ import print_function, unicode_literals
+
+import re
+
+import ttfw_idf
+
+
+@ttfw_idf.idf_example_test(env_tag='Example_GENERIC')
+def test_examples_asio_chat(env, _):  # type: (ttfw_idf.TinyFW.Env, None) -> None
+    msg = 'asio-chat: received hi'
+    dut = env.get_dut('asio_chat', 'examples/protocols/asio/asio_chat')
+    # start the test and expect the client to receive back it's original data
+    dut.start_app()
+    dut.expect(re.compile(r'{}'.format('Waiting for input')), timeout=30)
+    dut.write(msg)
+    dut.write('exit')
+    dut.expect(re.compile(r'{}'.format(msg)), timeout=30)
+
+
+if __name__ == '__main__':
+    test_examples_asio_chat()