df tests: node still correctly picks up new tx if broadcast fails

Now that we're more broadcast failure aware, let's check that on
actual broadcast failure we still update UTXO set properly and the
channel opens.

tests/test_connection.py

@@ -2718,6 +2718,47 @@ def mock_donothing(r):
     assert len(l2.rpc.listpeers(l1.info['id'])['peers']) == 0
 
 
+@pytest.mark.developer("needs --dev-max-funding-unconfirmed-blocks")
+@pytest.mark.openchannel('v2')
+def test_fundee_node_unconfirmed(node_factory, bitcoind):
+    """Test that fundee will successfully broadcast and
+    funder still has correct UTXOs/correctly advances the channel
+    """
+    # opener
+    l1, l2 = node_factory.line_graph(2, fundchannel=False)
+
+    # Give opener some funds.
+    l1.fundwallet(10**7)
+
+    start_amount = only_one(l1.rpc.listfunds()['outputs'])['amount_msat']
+
+    def mock_sendrawtransaction(r):
+        return {'id': r['id'], 'error': {'code': 100, 'message': 'sendrawtransaction disabled'}}
+
+    def mock_donothing(r):
+        time.sleep(10)
+        return bitcoind.rpc.sendrawtransaction(r['params'][0])
+
+    # Prevent both from broadcasting funding tx (any tx really).
+    l1.daemon.rpcproxy.mock_rpc('sendrawtransaction', mock_sendrawtransaction)
+    l2.daemon.rpcproxy.mock_rpc('sendrawtransaction', mock_donothing)
+
+    # Fund the channel.
+    # The process will complete, but opener will be unable
+    # to broadcast and confirm funding tx.
+    with pytest.raises(RpcError, match=r'sendrawtransaction disabled'):
+        l1.rpc.fundchannel(l2.info['id'], 10**6)
+
+    # Generate blocks until unconfirmed.
+    bitcoind.generate_block(1, wait_for_mempool=1)
+
+    # Check that l1 opened the channel
+    wait_for(lambda: only_one(only_one(l1.rpc.listpeers()['peers'])['channels'])['state'] == 'CHANNELD_NORMAL')
+    end_amount = only_one(l1.rpc.listfunds()['outputs'])['amount_msat']
+    # We should be out the onchaind fees
+    assert start_amount > end_amount + Millisatoshi(10 ** 7 * 100)
+
+
 @pytest.mark.developer("needs dev_fail")
 def test_no_fee_estimate(node_factory, bitcoind, executor):
     l1 = node_factory.get_node(start=False, options={'dev-no-fake-fees': True})