diff --git a/testing/util.py b/testing/util.py
index 837a3cb..fac498c 100644
--- a/testing/util.py
+++ b/testing/util.py
@@ -1,7 +1,6 @@
 from __future__ import absolute_import
 from __future__ import unicode_literals
 
-import io
 import os.path
 
 
@@ -10,9 +9,3 @@ TESTING_DIR = os.path.abspath(os.path.dirname(__file__))
 
 def get_resource_path(path):
     return os.path.join(TESTING_DIR, 'resources', path)
-
-
-def write_file(filename, contents):
-    """Hax because coveragepy chokes on nested context managers."""
-    with io.open(filename, 'w', newline='') as file_obj:
-        file_obj.write(contents)
diff --git a/tests/check_merge_conflict_test.py b/tests/check_merge_conflict_test.py
index f1528b2..bb2735c 100644
--- a/tests/check_merge_conflict_test.py
+++ b/tests/check_merge_conflict_test.py
@@ -5,11 +5,11 @@ import os
 import shutil
 
 import pytest
+from py.path import local
 
 from pre_commit_hooks.check_merge_conflict import detect_merge_conflict
 from pre_commit_hooks.util import cmd_output
 from testing.util import get_resource_path
-from testing.util import write_file
 
 
 @pytest.yield_fixture
@@ -103,7 +103,7 @@ def test_merge_conflicts_git():
 )
 @pytest.mark.usefixtures('repository_is_pending_merge')
 def test_merge_conflicts_failing(failing_contents):
-    write_file('f2', failing_contents)
+    local('f2').write(failing_contents)
     assert detect_merge_conflict(['f2']) == 1
 
 
@@ -112,7 +112,7 @@ def test_merge_conflicts_failing(failing_contents):
 )
 @pytest.mark.usefixtures('f1_is_a_conflict_file')
 def test_merge_conflicts_ok(ok_contents):
-    write_file('f1', ok_contents)
+    local('f1').write(ok_contents)
     assert detect_merge_conflict(['f1']) == 0