add test py code

Author: AllyW

src/attestation/azext_attestation/__init__.py

@@ -21,8 +21,7 @@ def __init__(self, cli_ctx=None):
         from azure.cli.core.commands import CliCommandType
         attestation_custom = CliCommandType(
             operations_tmpl='azext_attestation.custom#{}')
-        parent = super(AttestationManagementClientCommandsLoader, self)
-        parent.__init__(cli_ctx=cli_ctx, custom_command_type=attestation_custom)
+        super().__init__(cli_ctx=cli_ctx, custom_command_type=attestation_custom)
 
     def load_command_table(self, args):
         from azext_attestation.commands import load_command_table