Add system example tests

examples/system/unit_test/example_test.py

@@ -0,0 +1,24 @@
+from __future__ import unicode_literals
+import re
+import ttfw_idf
+
+
+@ttfw_idf.idf_example_test(env_tag='Example_WIFI')
+def test_examples_unit_test(env, extra_data):
+
+    dut = env.get_dut('unit_test', 'examples/system/unit_test')
+    dut.start_app()
+
+    def get_reg_nums(number):
+        return re.compile(r'\d{1,2}\s+' * number)
+
+    dut.expect_all('In main application. Collecting 32 random numbers from 1 to 100:',
+                   get_reg_nums(10),
+                   get_reg_nums(10),
+                   get_reg_nums(10),
+                   get_reg_nums(2),
+                   timeout=30)
+
+
+if __name__ == '__main__':
+    test_examples_unit_test()