openchannel: test new hook chainable mechanics

tests/plugins/openchannel_hook_reject.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+"""Plugin to test openchannel_hook
+
+Will simply reject any channel with message "reject on principle".
+Useful fot testing chained hook.
+"""
+
+from pyln.client import Plugin
+
+plugin = Plugin()
+
+
+@plugin.hook('openchannel')
+def on_openchannel(openchannel, plugin, **kwargs):
+    msg = "reject on principle"
+    plugin.log(msg)
+    return {'result': 'reject', 'error_message': msg}
+
+
+plugin.run()