diff --git a/tests/conftest.py b/tests/conftest.py
index 6f8682a..9446871 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,18 +1,21 @@
 # coding=utf-8
-"""Plugins for pytest."""
+"""pytest fixtures for this directory."""
 
 from textwrap import dedent
 
 import pytest
 
 
-@pytest.fixture(scope='function')
-def tempdir(tmpdir):
-    """A tmpdir fixture with prepared source files.
+@pytest.fixture(autouse=True)
+def sample_code(tmpdir):
+    """Sample source files.
 
     :param tmpdir: pytest fixture.
+
+    :return: tmpdir fixture.
+    :rtype: py.path
     """
-    tmpdir.join('empty').ensure_dir()
+    tmpdir.ensure_dir('empty')
     tmpdir.join('sample.py').write(dedent("""\
     #!/usr/bin/env python
     import sys
diff --git a/tests/test_default.py b/tests/test_default.py
index f5378af..b06290d 100644
--- a/tests/test_default.py
+++ b/tests/test_default.py
@@ -25,19 +25,19 @@
 
 
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
-def test_direct(capsys, monkeypatch, tempdir, stdin):
+def test_direct(capsys, monkeypatch, tmpdir, stdin):
     """Test by calling flake8.main.main() using the same running python process.
 
     :param capsys: pytest fixture.
     :param monkeypatch: pytest fixture.
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str stdin: Pipe this file to stdin of flake8.
     """
     # Prepare.
-    monkeypatch.chdir(tempdir.join('empty' if stdin else ''))
+    monkeypatch.chdir(tmpdir.join('empty' if stdin else ''))
     monkeypatch.setattr('sys.argv', ['flake8', '-' if stdin else '.', '-j1'])
     if stdin:
-        monkeypatch.setattr('pep8.stdin_get_value', lambda: tempdir.join(stdin).read())
+        monkeypatch.setattr('pep8.stdin_get_value', lambda: tmpdir.join(stdin).read())
 
     # Execute.
     with pytest.raises(SystemExit):
@@ -58,15 +58,15 @@ def test_direct(capsys, monkeypatch, tempdir, stdin):
 
 
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
-def test_subprocess(tempdir, stdin):
+def test_subprocess(tmpdir, stdin):
     """Test by calling flake8 through subprocess using a dedicated python process.
 
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str stdin: Pipe this file to stdin of flake8.
     """
     # Prepare.
-    cwd = str(tempdir.join('empty' if stdin else ''))
-    stdin_handle = tempdir.join(stdin).open() if stdin else None
+    cwd = str(tmpdir.join('empty' if stdin else ''))
+    stdin_handle = tmpdir.join(stdin).open() if stdin else None
 
     # Execute.
     command = [find_executable('flake8'), '--exit-zero', '-' if stdin else '.']
diff --git a/tests/test_explain.py b/tests/test_explain.py
index b620b37..87e941b 100644
--- a/tests/test_explain.py
+++ b/tests/test_explain.py
@@ -125,26 +125,26 @@
 
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
 @pytest.mark.parametrize('which_cfg', ['tox.ini', 'tox.ini flake8', 'setup.cfg', '.pep257'])
-def test_direct(capsys, monkeypatch, tempdir, stdin, which_cfg):
+def test_direct(capsys, monkeypatch, tmpdir, stdin, which_cfg):
     """Test by calling flake8.main.main() using the same running python process.
 
     :param capsys: pytest fixture.
     :param monkeypatch: pytest fixture.
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str stdin: Pipe this file to stdin of flake8.
     :param str which_cfg: Which config file to test with.
     """
     # Prepare.
-    monkeypatch.chdir(tempdir.join('empty' if stdin else ''))
+    monkeypatch.chdir(tmpdir.join('empty' if stdin else ''))
     monkeypatch.setattr('sys.argv', ['flake8', '-' if stdin else '.', '-j1'])
     if stdin:
-        monkeypatch.setattr('pep8.stdin_get_value', lambda: tempdir.join(stdin).read())
+        monkeypatch.setattr('pep8.stdin_get_value', lambda: tmpdir.join(stdin).read())
 
     # Write configuration.
     cfg = which_cfg.split()
     section = cfg[1] if len(cfg) > 1 else 'pep257'
     key = 'show-pep257' if section == 'flake8' else 'explain'
-    tempdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\n{1} = True\n'.format(section, key))
+    tmpdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\n{1} = True\n'.format(section, key))
 
     # Execute.
     with pytest.raises(SystemExit):
@@ -166,22 +166,22 @@ def test_direct(capsys, monkeypatch, tempdir, stdin, which_cfg):
 
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
 @pytest.mark.parametrize('which_cfg', ['tox.ini', 'tox.ini flake8', 'setup.cfg', '.pep257'])
-def test_subprocess(tempdir, stdin, which_cfg):
+def test_subprocess(tmpdir, stdin, which_cfg):
     """Test by calling flake8 through subprocess using a dedicated python process.
 
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str stdin: Pipe this file to stdin of flake8.
     :param str which_cfg: Which config file to test with.
     """
     # Prepare.
-    cwd = str(tempdir.join('empty' if stdin else ''))
-    stdin_handle = tempdir.join(stdin).open() if stdin else None
+    cwd = str(tmpdir.join('empty' if stdin else ''))
+    stdin_handle = tmpdir.join(stdin).open() if stdin else None
 
     # Write configuration.
     cfg = which_cfg.split()
     section = cfg[1] if len(cfg) > 1 else 'pep257'
     key = 'show-pep257' if section == 'flake8' else 'explain'
-    tempdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\n{1} = True\n'.format(section, key))
+    tmpdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\n{1} = True\n'.format(section, key))
 
     # Execute.
     command = [find_executable('flake8'), '--exit-zero', '-' if stdin else '.']
diff --git a/tests/test_ignore.py b/tests/test_ignore.py
index ea61614..c2340f2 100644
--- a/tests/test_ignore.py
+++ b/tests/test_ignore.py
@@ -23,26 +23,26 @@
 @pytest.mark.parametrize('ignore', ['D203,D204', 'D2'])
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
 @pytest.mark.parametrize('which_cfg', ['tox.ini', 'tox.ini flake8', 'setup.cfg', '.pep257'])
-def test_direct(capsys, monkeypatch, tempdir, ignore, stdin, which_cfg):
+def test_direct(capsys, monkeypatch, tmpdir, ignore, stdin, which_cfg):
     """Test by calling flake8.main.main() using the same running python process.
 
     :param capsys: pytest fixture.
     :param monkeypatch: pytest fixture.
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str ignore: Config value for ignore option.
     :param str stdin: Pipe this file to stdin of flake8.
     :param str which_cfg: Which config file to test with.
     """
     # Prepare.
-    monkeypatch.chdir(tempdir.join('empty' if stdin else ''))
+    monkeypatch.chdir(tmpdir.join('empty' if stdin else ''))
     monkeypatch.setattr('sys.argv', ['flake8', '-' if stdin else '.', '-j1'])
     if stdin:
-        monkeypatch.setattr('pep8.stdin_get_value', lambda: tempdir.join(stdin).read())
+        monkeypatch.setattr('pep8.stdin_get_value', lambda: tmpdir.join(stdin).read())
 
     # Write configuration.
     cfg = which_cfg.split()
     section = cfg[1] if len(cfg) > 1 else 'pep257'
-    tempdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\nignore = {1}\n'.format(section, ignore))
+    tmpdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\nignore = {1}\n'.format(section, ignore))
 
     # Execute.
     with pytest.raises(SystemExit):
@@ -65,22 +65,22 @@ def test_direct(capsys, monkeypatch, tempdir, ignore, stdin, which_cfg):
 @pytest.mark.parametrize('ignore', ['D203,D204', 'D2'])
 @pytest.mark.parametrize('stdin', ['', 'sample_unicode.py', 'sample.py'])
 @pytest.mark.parametrize('which_cfg', ['tox.ini', 'tox.ini flake8', 'setup.cfg', '.pep257'])
-def test_subprocess(tempdir, ignore, stdin, which_cfg):
+def test_subprocess(tmpdir, ignore, stdin, which_cfg):
     """Test by calling flake8 through subprocess using a dedicated python process.
 
-    :param tempdir: conftest fixture.
+    :param tmpdir: pytest fixture.
     :param str ignore: Config value for ignore option.
     :param str stdin: Pipe this file to stdin of flake8.
     :param str which_cfg: Which config file to test with.
     """
     # Prepare.
-    cwd = str(tempdir.join('empty' if stdin else ''))
-    stdin_handle = tempdir.join(stdin).open() if stdin else None
+    cwd = str(tmpdir.join('empty' if stdin else ''))
+    stdin_handle = tmpdir.join(stdin).open() if stdin else None
 
     # Write configuration.
     cfg = which_cfg.split()
     section = cfg[1] if len(cfg) > 1 else 'pep257'
-    tempdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\nignore = {1}\n'.format(section, ignore))
+    tmpdir.join('empty' if stdin else '', cfg[0]).write('[{0}]\nignore = {1}\n'.format(section, ignore))
 
     # Execute.
     command = [find_executable('flake8'), '--exit-zero', '-' if stdin else '.']