test-bootup: check if router does not specify WAN access after boot

This checks if there is no configuration fo WAN after clean boot. This
is intended as default that foces user to go immediately trough first
setup guide and configure router and primarily the administration
password.

tests/test_bootup.py

@@ -93,3 +93,11 @@ def test_lighttpd(lan1_client):
     """
     pexp = Shell(lan1_client.pexpect())
     pexp.run("wget 192.168.1.1 && rm index.html")
+
+
+def test_no_wan(client_board):
+    """The router should not have WAN interface configured to any valid setting as we want to force users to first go
+    trough first setup guide and set password there.
+    """
+    client_board.run("uci get network.wan.proto")
+    assert client_board.output == "none"