CI: migrated system example tests to pytest-embedded framework

examples/system/unit_test/pytest_unittest.py

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: CC0-1.0
+
+import pytest
+from pytest_embedded import Dut
+
+
+@pytest.mark.supported_targets
+@pytest.mark.generic
+def test_unit_test(dut: Dut) -> None:
+
+    def get_reg_nums(number: int) -> str:
+        return r'\d{1,2}\s+' * number
+
+    dut.expect_exact('In main application. Collecting 32 random numbers from 1 to 100:')
+    dut.expect(get_reg_nums(10))
+    dut.expect(get_reg_nums(10))
+    dut.expect(get_reg_nums(10))
+    dut.expect(get_reg_nums(2))