plugins/python/regress: add test for callback error msg return

plugins/python/regress/plugin_errorstr.py

@@ -0,0 +1,18 @@
+import sudo
+
+
+# The purpose of this class is that all methods you call on its object
+# raises a PluginError with a message containing the name of the called method.
+# Eg. if you call "ErrorMsgPlugin().some_method()" it will raise
+#   "Something wrong in some_method"
+class ErrorMsgPlugin(sudo.Plugin):
+    def __getattr__(self, name):
+        def raiser_func(*args):
+            raise sudo.PluginError("Something wrong in " + name)
+
+        return raiser_func
+
+
+class ConstructErrorPlugin(sudo.Plugin):
+    def __init__(self, **kwargs):
+        raise sudo.PluginError("Something wrong in plugin constructor")