pytest: Add a test for the grpc plugin

Currently still unencrypted, but will get its mTLS authentication in
the next commits.

tests/test_cln_rs.py

@@ -1,10 +1,14 @@
-from fixtures import *  # noqa: F401,F403
-from pathlib import Path
-from pyln.testing.utils import env, TEST_NETWORK
-import subprocess
 import os
-import pytest
+import subprocess
+from pathlib import Path
 
+import grpc
+import node_pb2 as nodepb
+import pytest
+from fixtures import TEST_NETWORK
+from fixtures import *  # noqa: F401,F403
+from node_pb2_grpc import NodeStub
+from pyln.testing.utils import env
 
 # Skip the entire module if we don't have Rust.
 pytestmark = pytest.mark.skipif(
@@ -21,3 +25,17 @@ def test_rpc_client(node_factory):
     rpc_path = Path(l1.daemon.lightning_dir) / TEST_NETWORK / "lightning-rpc"
     out = subprocess.check_output([bin_path, rpc_path], stderr=subprocess.STDOUT)
     assert(b'0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518' in out)
+
+
+def test_grpc_connect(node_factory):
+    """Attempts to connect to the grpc interface and call getinfo"""
+    bin_path = Path.cwd() / "target" / "debug" / "grpc-plugin"
+    node_factory.get_node(options={"plugin": str(bin_path)})
+    channel = grpc.insecure_channel("localhost:50051")
+    stub = NodeStub(channel)
+
+    response = stub.Getinfo(nodepb.GetinfoRequest())
+    print(response)
+
+    response = stub.ListFunds(nodepb.ListfundsRequest())
+    print(response)