Move _uniquepath to pathlib as unique_path.

Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

testing/test_conftest.py

@@ -4,9 +4,9 @@ import textwrap
 import py
 
 import pytest
-from _pytest.config import _uniquepath
 from _pytest.config import PytestPluginManager
 from _pytest.main import ExitCode
+from _pytest.pathlib import unique_path
 
 
 def ConftestWithSetinitial(path):
@@ -143,11 +143,11 @@ def test_conftestcutdir(testdir):
     # but we can still import a conftest directly
     conftest._importconftest(conf)
     values = conftest._getconftestmodules(conf.dirpath())
-    assert values[0].__file__.startswith(str(_uniquepath(conf)))
+    assert values[0].__file__.startswith(str(unique_path(conf)))
     # and all sub paths get updated properly
     values = conftest._getconftestmodules(p)
     assert len(values) == 1
-    assert values[0].__file__.startswith(str(_uniquepath(conf)))
+    assert values[0].__file__.startswith(str(unique_path(conf)))
 
 
 def test_conftestcutdir_inplace_considered(testdir):
@@ -156,7 +156,7 @@ def test_conftestcutdir_inplace_considered(testdir):
     conftest_setinitial(conftest, [conf.dirpath()], confcutdir=conf.dirpath())
     values = conftest._getconftestmodules(conf.dirpath())
     assert len(values) == 1
-    assert values[0].__file__.startswith(str(_uniquepath(conf)))
+    assert values[0].__file__.startswith(str(unique_path(conf)))
 
 
 @pytest.mark.parametrize("name", "test tests whatever .dotdir".split())
@@ -166,7 +166,7 @@ def test_setinitial_conftest_subdirs(testdir, name):
     conftest = PytestPluginManager()
     conftest_setinitial(conftest, [sub.dirpath()], confcutdir=testdir.tmpdir)
     if name not in ("whatever", ".dotdir"):
-        assert _uniquepath(subconftest) in conftest._conftestpath2mod
+        assert unique_path(subconftest) in conftest._conftestpath2mod
         assert len(conftest._conftestpath2mod) == 1
     else:
         assert subconftest not in conftest._conftestpath2mod