tests: add wg-quick stub; fix wg with no args

tests/wg

@@ -1,6 +1,9 @@
 #!/bin/sh
 
 case $1 in
+    '')
+        echo "nothing to see here"
+        ;;
     genkey)
         echo "ILICZ3yBMCGAWNIq5Pn0bewBVimW3Q2yRVJ/Be+b1Uc="
         ;;

tests/wg-quick

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+case $1 in
+    up)
+        echo "up $2"
+        ;;
+    pubkey)
+        echo "down $2"
+        ;;
+    *)
+        echo "what?"
+        exit 1
+        ;;
+esac