examples/gnrc_networking: add a test that app did not crash

Ensure the application did not crash as the shell is answering

examples/gnrc_networking/tests/01-run.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2019 Freie Universität Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import sys
+from testrunner import run
+
+
+def _check_shell_is_working(child, tries=5):
+    """Dirty check that the shell is working.
+
+    It ensures the application did not crash.
+    """
+    for i in range(0, tries):
+        child.sendline('help')
+        try:
+            child.expect_exact('Command              Description', timeout=1)
+            child.expect_exact('---------------------------------------',
+                               timeout=1)
+            child.expect_exact('> ', timeout=1)
+            break
+        except Exception:
+            pass
+    else:
+        child.expect('>')
+
+
+def testfunc(child):
+    _check_shell_is_working(child)
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))