diff --git a/tests/end_of_file_fixer_test.py b/tests/end_of_file_fixer_test.py
index 2e53246..3f0d0f0 100644
--- a/tests/end_of_file_fixer_test.py
+++ b/tests/end_of_file_fixer_test.py
@@ -18,21 +18,21 @@
 )
 
 
-@pytest.mark.parametrize(('input', 'expected_retval', 'output'), TESTS)
-def test_fix_file(input, expected_retval, output):
+@pytest.mark.parametrize(('input_s', 'expected_retval', 'output'), TESTS)
+def test_fix_file(input_s, expected_retval, output):
     file_obj = io.BytesIO()
-    file_obj.write(input)
+    file_obj.write(input_s)
     ret = fix_file(file_obj)
     assert file_obj.getvalue() == output
     assert ret == expected_retval
 
 
-@pytest.mark.parametrize(('input', 'expected_retval', 'output'), TESTS)
-def test_integration(input, expected_retval, output, tmpdir):
+@pytest.mark.parametrize(('input_s', 'expected_retval', 'output'), TESTS)
+def test_integration(input_s, expected_retval, output, tmpdir):
     file_path = os.path.join(tmpdir.strpath, 'file.txt')
 
     with open(file_path, 'wb') as file_obj:
-        file_obj.write(input)
+        file_obj.write(input_s)
 
     ret = end_of_file_fixer([file_path])
     file_output = open(file_path, 'rb').read()
diff --git a/tests/requirements_txt_fixer_test.py b/tests/requirements_txt_fixer_test.py
index 49b0bb7..4e5c5c1 100644
--- a/tests/requirements_txt_fixer_test.py
+++ b/tests/requirements_txt_fixer_test.py
@@ -17,12 +17,12 @@
 )
 
 
-@pytest.mark.parametrize(('input', 'expected_retval', 'output'), TESTS)
-def test_integration(input, expected_retval, output, tmpdir):
+@pytest.mark.parametrize(('input_s', 'expected_retval', 'output'), TESTS)
+def test_integration(input_s, expected_retval, output, tmpdir):
     path = os.path.join(tmpdir.strpath, 'file.txt')
 
     with open(path, 'wb') as file_obj:
-        file_obj.write(input)
+        file_obj.write(input_s)
 
     assert fix_requirements_txt([path]) == expected_retval
     assert open(path, 'rb').read() == output
diff --git a/tests/trailing_whitespace_fixer_test.py b/tests/trailing_whitespace_fixer_test.py
index 1c57b10..bf508c0 100644
--- a/tests/trailing_whitespace_fixer_test.py
+++ b/tests/trailing_whitespace_fixer_test.py
@@ -9,8 +9,8 @@
                 ('foo.py', 'foo \nbar \n'),
                 ('bar.py', 'bar\t\nbaz\t\n'),
         ):
-            with open(filename, 'w') as f:
-                f.write(contents)  # pragma: no cover (python 2.6 coverage bug)
+            with open(filename, 'w') as file_obj:
+                file_obj.write(contents)  # pragma: no cover (26 coverage bug)
 
         ret = fix_trailing_whitespace(['foo.py', 'bar.py'])
         assert ret == 1
diff --git a/tests/util_test.py b/tests/util_test.py
deleted file mode 100644
index 28ebe81..0000000
--- a/tests/util_test.py
+++ /dev/null
@@ -1,27 +0,0 @@
-import mock
-import pytest
-import sys
-
-from pre_commit_hooks.util import entry
-
-
-@pytest.fixture
-def entry_func():
-    @entry
-    def func(argv):
-        return argv
-
-    return func
-
-
-def test_explicitly_passed_argv_are_passed(entry_func):
-    input = object()
-    ret = entry_func(input)
-    assert ret is input
-
-
-def test_no_arguments_passed_uses_argv(entry_func):
-    argv = [1, 2, 3, 4]
-    with mock.patch.object(sys, 'argv', argv):
-        ret = entry_func()
-        assert ret == argv[1:]