graph: add simple test to check graph can be generated successfully

.github/workflows/test.yml

@@ -25,3 +25,9 @@ jobs:
       - uses: actions/checkout@v3
       - uses: ./.github/actions
       - run: ./test/rpc_test.py
+  graph:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions
+      - run: ./test/test_graph.py

test/test_graph.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+import tempfile
+import uuid
+from pathlib import Path
+from test_base import TestBase
+from warnet.utils import DEFAULT_TAG
+
+base = TestBase()
+base.network = False
+base.start_server()
+
+with tempfile.TemporaryDirectory() as dir:
+    tf = f"{dir}/{str(uuid.uuid4())}.graphml"
+    print(f"Writing test graph to {tf}")
+    print(base.warcli(f"graph create n=10 --outfile={tf} --version={DEFAULT_TAG}", network=False))
+    base.wait_for_predicate(lambda: Path(tf).exists())
+
+     # Test that the graph actually works
+    print(base.warcli(f"network start {Path(tf)}"))
+    base.wait_for_all_tanks_status(target="running")
+    base.warcli("rpc 0 getblockcount")
+
+base.stop_server()