remove _check_initialpaths_for_relpath

src/_pytest/nodes.py

@@ -391,12 +391,6 @@ def _prunetraceback(self, excinfo):
             excinfo.traceback = ntraceback.filter()
 
 
-def _check_initialpaths_for_relpath(session, fspath):
-    for initial_path in session._initialpaths:
-        if fspath.common(initial_path) == initial_path:
-            return fspath.relto(initial_path)
-
-
 class FSHookProxy:
     def __init__(
         self, fspath: py.path.local, pm: PytestPluginManager, remove_mods
@@ -427,15 +421,8 @@ def __init__(
 
         if nodeid is None:
             nodeid = session._node_location_to_relpath(self.fspath)
-
-            if not nodeid:
-                if not nodeid:
-                    assert 0, (2, self.fspath, parent, config, session)
-                nodeid = _check_initialpaths_for_relpath(session, fspath)
-            if not nodeid:
-                assert 0, (self.fspath, parent, config, session)
-                nodeid = str(self.fspath)
-            if nodeid and os.sep != SEP:
+            assert nodeid, (2, fspath, session.config.rootdir)
+            if os.sep != SEP:
                 nodeid = nodeid.replace(os.sep, SEP)
 
         super().__init__(name, parent, config, session, nodeid=nodeid, fspath=fspath)

testing/test_nodes.py

@@ -1,5 +1,3 @@
-import py
-
 import pytest
 from _pytest import nodes
 
@@ -31,23 +29,3 @@ def test():
     )
     with pytest.raises(ValueError, match=".*instance of PytestWarning.*"):
         items[0].warn(UserWarning("some warning"))
-
-
-def test__check_initialpaths_for_relpath():
-    """Ensure that it handles dirs, and does not always use dirname."""
-    cwd = py.path.local()
-
-    class FakeSession:
-        _initialpaths = [cwd]
-
-    assert nodes._check_initialpaths_for_relpath(FakeSession, cwd) == ""
-
-    sub = cwd.join("file")
-
-    class FakeSession:
-        _initialpaths = [cwd]
-
-    assert nodes._check_initialpaths_for_relpath(FakeSession, sub) == "file"
-
-    outside = py.path.local("/outside")
-    assert nodes._check_initialpaths_for_relpath(FakeSession, outside) is None