Quick fix for tests in config depended on the current directory

When running those tests from pytest's root folder, they would
fail because they would end up picking pytest's own pytest.ini

Author: nicoddemus

testing/test_config.py

@@ -592,6 +592,7 @@ def test_setuppy_fallback(self, tmpdir):
         assert inicfg == {}
 
     def test_nothing(self, tmpdir):
+        tmpdir.chdir()
         rootdir, inifile, inicfg = determine_setup(None, [tmpdir])
         assert rootdir == tmpdir
         assert inifile is None
@@ -603,6 +604,7 @@ def test_with_specific_inifile(self, tmpdir):
         assert rootdir == tmpdir
 
     def test_with_arg_outside_cwd_without_inifile(self, tmpdir):
+        tmpdir.chdir()
         a = tmpdir.mkdir("a")
         b = tmpdir.mkdir("b")
         rootdir, inifile, inicfg = determine_setup(None, [a, b])