vfs: fix build & ci errors

examples/system/eventfd/example_test.py

@@ -0,0 +1,29 @@
+from __future__ import unicode_literals
+
+import os
+
+import ttfw_idf
+from tiny_test_fw import Env, Utility
+
+
+@ttfw_idf.idf_example_test(env_tag='Example_GENERIC')
+def test_examples_eventfd(env, extra_data):
+    # type: (Env, None) -> None
+
+    dut = env.get_dut('eventfd', 'examples/system/eventfd')
+    dut.start_app()
+
+    dut.expect('cpu_start: Starting scheduler', timeout=30)
+
+    exp_list = [
+        'eventfd_example: Select timeouted for 4 times',
+        'eventfd_example: Timer triggerred for 4 times',
+        'eventfd_example: Progress triggerred for 3 times',
+    ]
+
+    Utility.console_log('Expecting:{}{}'.format(os.linesep, os.linesep.join(exp_list)))
+    dut.expect_all(*exp_list, timeout=60)
+
+
+if __name__ == '__main__':
+    test_examples_eventfd()