Fix bad refactor.

Author: ionelmc

tests/test_pytest_cov.py

@@ -1312,17 +1312,17 @@ def test_cover_conftest(testdir):
 
 
 @pytest.mark.skipif('sys.platform == "win32" and platform.python_implementation() == "PyPy"')
-def test_cover_looponfail(pytester, testdir, monkeypatch):
+def test_cover_looponfail(testdir, monkeypatch):
     testdir.makepyfile(mod=MODULE)
     testdir.makeconftest(CONFTEST)
     script = testdir.makepyfile(BASIC_TEST)
 
     def mock_run(*args, **kwargs):
         return _TestProcess(*map(str, args))
 
-    monkeypatch.setattr(pytester, testdir, 'run', mock_run)
+    monkeypatch.setattr(testdir, 'run', mock_run)
     assert testdir.run is mock_run
-    if hasattr(pytester, testdir, '_pytester'):
+    if hasattr(testdir, '_pytester'):
         monkeypatch.setattr(testdir._pytester, 'run', mock_run)
         assert testdir._pytester.run is mock_run
     with testdir.runpytest('-v',