paytest: Create a new plugin to test pay implementations

paytest/test_paytest.py

@@ -0,0 +1,60 @@
+from pyln.testing.fixtures import *  # noqa: F401,F403
+from pyln.testing.utils import DEVELOPER
+from pyln.client import RpcError
+import os
+import unittest
+import pytest
+from pprint import pprint
+
+
+pluginopt = {'plugin': os.path.join(os.path.dirname(__file__), "paytest.py")}
+EXPERIMENTAL_FEATURES = int(os.environ.get("EXPERIMENTAL_FEATURES", "0"))
+
+
+def test_start(node_factory):
+    node_factory.get_node(options=pluginopt)
+
+
+def test_invoice(node_factory):
+    l1 = node_factory.get_node(options=pluginopt)
+    inv = l1.rpc.testinvoice('03'*33)
+    details = l1.rpc.decodepay(inv['invoice'])
+    pprint(details)
+
+
+def test_simple_pay(node_factory):
+    """ l1 generates and pays an invoice on behalf of l2.
+    """
+    l1, l2 = node_factory.line_graph(2, opts=pluginopt, wait_for_announce=True)
+
+    inv = l1.rpc.testinvoice(destination=l2.info['id'], amount=1)['invoice']
+    details = l1.rpc.decodepay(inv)
+    pprint(details)
+
+    # Paying the invoice without the reinterpretation from paytest
+    # will cause an unknown payment details directly.
+    with pytest.raises(RpcError, match=r'WIRE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS'):
+        l1.rpc.pay(inv)
+
+
+def test_mpp_pay(node_factory):
+    """ l1 send a payment that is going to be split.
+    """
+    l1, l2 = node_factory.line_graph(2, opts=pluginopt, wait_for_announce=True)
+    res = l1.rpc.paytest(l2.info['id'], 10**8)
+
+    from pprint import pprint
+    #pprint(res)
+
+    l2.daemon.wait_for_log(r'Received 100000000/100000000 with [0-9]+ parts')
+
+    parts = res['status']['attempts']
+    assert len(parts) > 2  # Initial split + >1 part
+
+    failures = [p['failure']['data'] for p in parts if 'failure' in p and 'data' in p['failure']]
+    pprint(failures)
+
+    outcomes = [f['failcode'] for f in failures]
+    is16399 = [p == 16399 for p in outcomes]
+    assert all(is16399)
+    assert len(is16399) >= 1