Improve testing of %pythonprepend and %pythonappend

Examples/test-suite/python_append.i

@@ -4,19 +4,34 @@ Testcase to test %pythonprepend and %pythonappend
 
 %module python_append 
 
+%pythoncode %{
+  import os.path
+  mypath = os.path.dirname("/a/b/c/d.txt")
+  funcpath = None
+  staticfuncpath = None
+  def grabpath():
+    return funcpath
+  def grabstaticpath():
+    return staticfuncpath
+%}
+
 %pythonappend Test::func %{
-    pass
+    funcpath = os.path.dirname(funcpath)
 %}
 
 %pythonprepend Test::func %{
-        pass
+        global funcpath
+        funcpath = mypath
 %}
 
 %pythonappend Test::static_func %{
+staticfuncpath = os.path.basename(staticfuncpath)
 pass   
 %}
 
 %pythonprepend Test::static_func {
+    global staticfuncpath
+    staticfuncpath = mypath
     pass
 }