keep test, warning

Author: blueyed

src/_pytest/deprecated.py

@@ -9,6 +9,7 @@
 in case of warnings which need to format their messages.
 """
 from _pytest.warning_types import PytestDeprecationWarning
+from _pytest.warning_types import UnformattedWarning
 
 # set of plugins which have been integrated into the core; we use this list to ignore
 # them during registration to avoid conflicts
@@ -35,6 +36,11 @@
     "as a keyword argument instead."
 )
 
+NODE_USE_FROM_PARENT = UnformattedWarning(
+    PytestDeprecationWarning,
+    "direct construction of {name} has been deprecated, please use {name}.from_parent",
+)
+
 JUNIT_XML_DEFAULT_FAMILY = PytestDeprecationWarning(
     "The 'junit_family' default value will change to 'xunit2' in pytest 6.0.\n"
     "Add 'junit_family=xunit1' to your pytest.ini file to keep the current format "

src/_pytest/nodes.py

@@ -19,6 +19,7 @@
 from _pytest.compat import getfslineno
 from _pytest.compat import TYPE_CHECKING
 from _pytest.config import Config
+from _pytest.deprecated import NODE_USE_FROM_PARENT
 from _pytest.fixtures import FixtureDef
 from _pytest.fixtures import FixtureLookupError
 from _pytest.fixtures import FixtureLookupErrorRepr

testing/deprecated_test.py

@@ -1,5 +1,8 @@
+import inspect
+
 import pytest
 from _pytest import deprecated
+from _pytest import nodes
 
 
 @pytest.mark.filterwarnings("default")
@@ -73,3 +76,17 @@ def test_foo():
         result.stdout.no_fnmatch_line(warning_msg)
     else:
         result.stdout.fnmatch_lines([warning_msg])
+
+
+def test_node_direct_ctor_warning():
+    class MockConfig:
+        pass
+
+    ms = MockConfig()
+    with pytest.warns(
+        DeprecationWarning,
+        match="direct construction of .* has been deprecated, please use .*.from_parent",
+    ) as w:
+        nodes.Node(name="test", config=ms, session=ms, nodeid="None")
+    assert w[0].lineno == inspect.currentframe().f_lineno - 1
+    assert w[0].filename == __file__