bolt2: add coop close test

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

tests/test_bolt2-01-close_channel.py

@@ -0,0 +1,124 @@
+#! /usr/bin/env python3
+"""
+testing bolt2 closing channel operation described in the lightning network speck
+https://github.com/lightning/bolts/blob/master/02-peer-protocol.md#channel-close
+
+The overview of what we test in this integration testing is described by the following
+figure.
+
+ +-------+                              +-------+
+ |       |--(1)-----  shutdown  ------->|       |
+ |       |<-(2)-----  shutdown  --------|       |
+ |       |                              |       |
+ |       | <complete all pending HTLCs> |       |
+ |       |    <must not add HTLCs>      |       |
+ |   A   |                 ...          |   B   |
+ |       |                              |       |
+ |       |--(3)-- closing_signed  F1--->|       |
+ |       |<-(4)-- closing_signed  F2----|       |
+ |       |              ...             |       |
+ |       |--(?)-- closing_signed  Fn--->|       |
+ |       |<-(?)-- closing_signed  Fn----|       |
+ +-------+                              +-------+
+
+BOLT 2 proposal https://github.com/lightning/bolts/pull/972
+
+ author: https://github.com/vincenzopalazzo
+"""
+from lnprototest import (
+    ExpectMsg,
+    Msg,
+    Runner,
+    MustNotMsg,
+)
+from helpers import run_runner, merge_events_sequences, tx_spendable
+from lnprototest.stash import channel_id
+from spec_helper import open_and_announce_channel_helper, connect_to_node_helper
+from lnprototest.utils import BitcoinUtils, ScriptType
+
+
+def test_close_channel_shutdown_msg_normal_case_receiver_side(runner: Runner) -> None:
+    """Close the channel with the other peer, and check if the
+    shutdown message works in the expected way.
+
+    In particular, this test will check the receiver side.
+
+     ________________________________
+    | runner -> shutdown -> ln-node |
+    | runner <- shutdown <- ln-node |
+    --------------------------------
+    """
+    # the option that the helper method feels for us
+    test_opts = {}
+    pre_events_conn = connect_to_node_helper(
+        runner, tx_spendable=tx_spendable, conn_privkey="03"
+    )
+    pre_events = open_and_announce_channel_helper(
+        runner, conn_privkey="03", opts=test_opts
+    )
+    # merge the two events
+    pre_events = merge_events_sequences(pre_events_conn, pre_events)
+    channel_idx = channel_id()
+
+    script = BitcoinUtils.build_valid_script()
+    test = [
+        # runner sent shutdown message to ln implementation
+        # BOLT 2:
+        # - MUST NOT send an `update_add_htlc` after a shutdown.
+        Msg(
+            "shutdown",
+            channel_id=channel_idx,
+            scriptpubkey=script,
+        ),
+        MustNotMsg("update_add_htlc"),
+        ExpectMsg(
+            "shutdown", ignore=ExpectMsg.ignore_all_gossip, channel_id=channel_idx
+        ),
+        # TODO: including in bitcoin function the possibility to sign this values
+        # Msg(
+        #    "closing_signed",
+        #    channel_id=channel_idx,
+        #    fee_satoshis='100',
+        #    signature="0000",
+        # ),
+        # ExpectMsg("closing_signed")
+    ]
+    run_runner(runner, merge_events_sequences(pre=pre_events, post=test))
+
+
+def test_close_channel_shutdown_msg_wrong_script_pubkey_receiver_side(
+    runner: Runner,
+) -> None:
+    """Test close operation from the receiver view point, in the case when
+    the sender set a wrong script pub key not specified in the spec.
+     ______________________________________________________
+    | runner -> shutdown (wrong script pub key) -> ln-node |
+    | runner <-         warning msg             <- ln-node |
+    -------------------------------------------------------
+    """
+    # the option that the helper method feels for us
+    test_opts = {}
+    pre_events_conn = connect_to_node_helper(
+        runner, tx_spendable=tx_spendable, conn_privkey="03"
+    )
+    pre_events = open_and_announce_channel_helper(
+        runner, conn_privkey="03", opts=test_opts
+    )
+    # merge the two events
+    pre_events = merge_events_sequences(pre_events_conn, pre_events)
+    channel_idx = channel_id()
+
+    script = BitcoinUtils.build_valid_script(ScriptType.INVALID_CLOSE_SCRIPT)
+
+    test = [
+        # runner sent shutdown message to the ln implementation
+        Msg(
+            "shutdown",
+            channel_id=channel_idx,
+            scriptpubkey=script,
+        ),
+        MustNotMsg("add_htlc"),
+        MustNotMsg("shutdown"),
+        ExpectMsg("warning", ignore=ExpectMsg.ignore_all_gossip),
+    ]
+    run_runner(runner, merge_events_sequences(pre=pre_events, post=test))