esp-idf: cpp: add pytest

Add pytest for automated testing of the cpp sample.

Signed-off-by: Mike Szczys <[email protected]>

examples/esp_idf/cpp/pytest/README.md

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+# CPP Test
+
+Compile an application in CPP and confirm it successfully connects to
+Golioth.
+
+See esp_idf/README.md for test requirements and commands to run the
+test.

examples/esp_idf/cpp/pytest/conftest.py

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+# Copyright (c) 2024 Golioth, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import pytest
+
+@pytest.fixture(scope='session')
+def anyio_backend():
+    return 'trio'

examples/esp_idf/cpp/pytest/test_sample.py

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+import logging
+import pytest
+from datetime import datetime, timezone
+import re
+
+pytestmark = pytest.mark.anyio
+
+async def test_hello(board, device):
+    # Set Golioth credential
+    golioth_cred = (await device.credentials.list())[0]
+    await board.set_golioth_psk_credentials(golioth_cred.identity, golioth_cred.key)
+
+    # Record timestamp and wait for fourth hello message
+    start = datetime.now(timezone.utc)
+    await board.wait_for_regex_in_line('.*Hello, Golioth 2!', timeout_s=90.0)
+
+    # Check logs for hello messages
+    end = datetime.now(timezone.utc)
+    logs = await device.get_logs({'start': start.strftime('%Y-%m-%dT%H:%M:%S.%fZ'), 'end': end.strftime('%Y-%m-%dT%H:%M:%S.%fZ')})
+
+    # Test logs received from server
+    r = re.compile(".*Hello, Golioth 1!")
+    matching_log = list(filter(r.match, [str(l) for l in logs]))
+    assert len(matching_log) == 1