Add tests for network node adding/removal

tests/unit_tests/_primaite/_simulator/_network/test_container.py

@@ -0,0 +1,16 @@
+import json
+
+from primaite.simulator.network.container import NetworkContainer
+
+
+def test_creating_container():
+    """Check that we can create a network container"""
+    net = NetworkContainer()
+    assert net.nodes and net.links
+
+
+def test_describe_state():
+    """Check that we can describe network state without raising errors, and that the result is JSON serialisable."""
+    net = NetworkContainer()
+    state = net.describe_state()
+    json.dumps(state)  # if this function call raises an error, the test fails, state was not JSON-serialisable