fixup: unittest argument implication deprecation

Author: RonnyPfannschmidt

src/_pytest/deprecated.py

@@ -66,7 +66,7 @@
 
 NODE_IMPLIED_ARG = UnformattedWarning(
     PytestDeprecationWarning,
-    "implying{type.__name__}.{arg} from parent.{arg} has been deprecated\n"
+    "implying {type.__name__}.{arg} from parent.{arg} has been deprecated\n"
     "please use the Node.from_parent to have them be implied by the superclass named ctors",
 )
 

testing/test_nodes.py

@@ -39,6 +39,34 @@ def test_node_from_parent_disallowed_arguments() -> None:
         nodes.Node.from_parent(None, name="none", config=None)  # type: ignore[arg-type]
 
 
+@pytest.mark.parametrize("absent_arg", ["nodeid", "config", "session", "fs_path"])
+def test_node_warns_implied_ctor_args(pytester, absent_arg):
+    config = pytester.parseconfigure()
+    from _pytest.main import Session
+
+    session = Session.from_config(config)
+
+    args = dict(
+        name="test",
+        nodeid="test",
+        session=session,
+        config=session.config,
+        fs_path=session.fs_path,
+    )
+    del args[absent_arg]
+
+    with pytest.warns(
+        PytestWarning,
+        match=fr"implying Node.{absent_arg} from parent.{absent_arg} has been deprecated\n"
+        "please use the Node.from_parent to have them be implied by the superclass named ctors",
+    ):
+        nodes.Node._create(parent=session, **args)
+
+
+def test_fspath_warns():
+    pass
+
+
 @pytest.mark.parametrize(
     "warn_type, msg", [(DeprecationWarning, "deprecated"), (PytestWarning, "pytest")]
 )