Plugins: Add a test for the 'invoice_payment' notfication

contrib/plugins/helloworld.py

@@ -34,6 +34,14 @@ def on_disconnect(plugin, id):
     plugin.log("Received disconnect event for peer {}".format(id))
 
 
+@plugin.subscribe("invoice_payment")
+def on_payment(plugin, invoice_payment):
+    plugin.log("Received invoice_payment event for label {}, preimage {},"
+               " and amount of {}".format(invoice_payment.get("label"),
+                                          invoice_payment.get("preimage"),
+                                          invoice_payment.get("msat")))
+
+
 @plugin.hook("htlc_accepted")
 def on_htlc_accepted(onion, htlc, plugin):
     plugin.log('on_htlc_accepted called')

tests/test_plugin.py

@@ -476,3 +476,21 @@ def test_warning_notification(node_factory):
     l1.daemon.wait_for_log('plugin-pretend_badlog.py time: *')
     l1.daemon.wait_for_log('plugin-pretend_badlog.py source: plugin-pretend_badlog.py')
     l1.daemon.wait_for_log('plugin-pretend_badlog.py log: Test warning notification\\(for broken event\\)')
+
+
+def test_invoice_payment_notification(node_factory):
+    """
+    Test the 'invoice_payment' notification
+    """
+    opts = [{}, {"plugin": "contrib/plugins/helloworld.py"}]
+    l1, l2 = node_factory.line_graph(2, opts=opts)
+
+    msats = 12345
+    preimage = '1' * 64
+    label = "a_descriptive_label"
+    inv1 = l2.rpc.invoice(msats, label, 'description', preimage=preimage)
+    l1.rpc.pay(inv1['bolt11'])
+
+    l2.daemon.wait_for_log(r"Received invoice_payment event for label {},"
+                           " preimage {}, and amount of {}msat"
+                           .format(label, preimage, msats))