vpnc: Use _parse_help instead of hardcoding options, add basic test case.

completions/vpnc

@@ -25,12 +25,8 @@ _vpnc()
     esac
 
     if [[ "$cur" == -* ]]; then
-        COMPREPLY=( $( compgen -W '--version --print-config --help \
-            --long-help --gateway --id --username --udp --domain \
-            --xauth-inter --script --dh --pfs --enable-1des \
-            --application-version --ifname --debug --no-detach \
-            --pid-file --local-port  --udp-port --disable-natt \
-            --non-inter' -- "$cur" ) )
+        COMPREPLY=( $( compgen -W '$( _parse_help "$1" --long-help )' \
+            -- "$cur" ) )
     else
         COMPREPLY=( $( compgen -W '$( command ls /etc/vpnc )' -- "$cur" ) )
     fi

test/completion/vpnc.exp

@@ -0,0 +1 @@
+assert_source_completions vpnc

test/lib/completions/vpnc.exp

@@ -0,0 +1,18 @@
+proc setup {} {
+    save_env
+}
+
+
+proc teardown {} {
+    assert_env_unmodified
+}
+
+
+setup
+
+
+assert_complete_any "vpnc -"
+sync_after_int
+
+
+teardown