pyln-client/gossmap: adds testcase for half channels

contrib/pyln-client/tests/test_gossmap.py

@@ -49,6 +49,53 @@ def test_gossmap(tmp_path):
     assert channel2.satoshis == 3000000
 
 
+def test_gossmap_halfchannel(tmp_path):
+    """ this test a simple [l1->l2] gossip store that was created by the pyln-testing framework """
+    sfile = unxz_data_tmp("gossip_store.simple.xz", tmp_path, "gossip_store", "xb")
+    g = Gossmap(sfile)
+
+    l1id = "022d223620a359a47ff7f7ac447c85c46c923da53389221a0054c11c1e3ca31d59"
+    l2id = "0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518"
+
+    # check structure parsed correctly
+    assert(len(g.nodes) == 2)
+    n1 = g.get_node(l1id)
+    n2 = g.get_node(l2id)
+    assert n1
+    assert n2
+
+    chan = g.get_channel("103x1x1")
+    assert chan
+    assert chan.node1 == n1
+    assert chan.node2 == n2
+
+    half0 = chan.get_direction(0)
+    half1 = chan.get_direction(1)
+    assert half0
+    assert half1
+    assert half0.direction == 0
+    assert half1.direction == 1
+    assert half0.channel == chan
+    assert half1.channel == chan
+    assert half0.source == n1
+    assert half0.destination == n2
+    assert half1.source == n2
+    assert half1.destination == n1
+
+    # check metadata
+    assert half0.timestamp == 1631005020
+    assert half1.timestamp == 1631005020
+    assert half0.cltv_expiry_delta == 6
+    assert half1.cltv_expiry_delta == 6
+    assert half0.htlc_minimum_msat == 0
+    assert half1.htlc_minimum_msat == 0
+    assert half0.htlc_maximum_msat == 990000000
+    assert half1.htlc_maximum_msat == 990000000
+    assert half0.fee_base_msat == 1
+    assert half1.fee_base_msat == 1
+    assert half0.fee_proportional_millionths == 10
+
+
 def test_objects():
     boltz = "026165850492521f4ac8abd9bd8088123446d126f648ca35e60f88177dc149ceb2"
     acinq = "03864ef025fde8fb587d989186ce6a4a186895ee44a926bfc370e2c366597a3f8f"