diff --git a/tests/test_compose_node_name.py b/tests/test_compose_node_name.py
index d336eca..14b79f9 100644
--- a/tests/test_compose_node_name.py
+++ b/tests/test_compose_node_name.py
@@ -1,37 +1,50 @@
+import pytest
 import reclass_rs
 
 
+def test_no_compose_node_name_compat_collision():
+    config = reclass_rs.Config.from_dict(
+        inventory_path="./tests/inventory-compose-node-name",
+        config={"reclass_rs_compat_flags": ["compose-node-name-literal-dots"]},
+    )
+    assert config.compatflags == {reclass_rs.CompatFlag.ComposeNodeNameLiteralDots}
+    with pytest.raises(ValueError) as exc:
+        r = reclass_rs.Reclass.from_config(config)
+
+    assert "Error while discovering nodes: Definition of node '1'" in str(exc)
+
+
 def test_no_compose_node_name_compat():
-    r = reclass_rs.Reclass(inventory_path="./tests/inventory-compose-node-name")
+    r = reclass_rs.Reclass(inventory_path="./tests/inventory-nested-nodes")
     r.set_compat_flag(reclass_rs.CompatFlag.ComposeNodeNameLiteralDots)
     assert not r.config.compose_node_name
     assert r.config.compatflags == {reclass_rs.CompatFlag.ComposeNodeNameLiteralDots}
 
     inv = r.inventory()
 
-    assert set(inv.nodes.keys()) == {"a.1", "a", "d"}
+    assert set(inv.nodes.keys()) == {"a1", "b1", "c1", "d1"}
 
-    a1 = inv.nodes["a.1"].parameters["_reclass_"]["name"]
-    assert a1["full"] == "a.1"
-    assert a1["parts"] == ["a.1"]
-    assert a1["path"] == "a.1"
-    assert a1["short"] == "a.1"
+    a1 = inv.nodes["a1"].parameters["_reclass_"]["name"]
+    assert a1["full"] == "a1"
+    assert a1["parts"] == ["a1"]
+    assert a1["path"] == "a1"
+    assert a1["short"] == "a1"
 
 
 def test_no_compose_node_name():
-    r = reclass_rs.Reclass(inventory_path="./tests/inventory-compose-node-name")
+    r = reclass_rs.Reclass(inventory_path="./tests/inventory-nested-nodes")
     assert not r.config.compose_node_name
     assert r.config.compatflags == set()
 
     inv = r.inventory()
 
-    assert set(inv.nodes.keys()) == {"a.1", "a", "d"}
+    assert set(inv.nodes.keys()) == {"a1", "b1", "c1", "d1"}
 
-    a1 = inv.nodes["a.1"].parameters["_reclass_"]["name"]
-    assert a1["full"] == "a.1"
-    assert a1["parts"] == ["a.1"]
-    assert a1["path"] == "a.1"
-    assert a1["short"] == "a.1"
+    a1 = inv.nodes["a1"].parameters["_reclass_"]["name"]
+    assert a1["full"] == "a1"
+    assert a1["parts"] == ["a1"]
+    assert a1["path"] == "a1"
+    assert a1["short"] == "a1"
 
 
 def test_compose_node_name_compat():