diff --git a/tests/conftest.py b/tests/conftest.py
index 5b307ad..c183eee 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -48,33 +48,3 @@ def twenty_cls_tests():
     for i in range(20):
         code.append("\tdef test_b{0}(self): self.assertTrue\n".format(str(i).zfill(2)))
     return "".join(code)
-
-
-def _deindent_source(source):
-    """
-    A minimal replacement for py.code.Source to deindent inlined test code.
-    Looks for the first non-empty line to determine deindent offset, doesn't
-    attempt to understand the code, line continuations, etc.
-    """
-    lines = source.splitlines()
-    for line in lines:
-        stripped = line.lstrip()
-        if stripped:
-            offset = len(line) - len(stripped)
-            break
-    else:
-        offset = 0
-
-    output_lines = []
-    for line in lines:
-        output_lines.append(line[offset:])
-
-    return "\n".join(output_lines)
-
-
-@pytest.fixture
-def deindent_source():
-    """
-    Returns a helper function to deindent inlined source code.
-    """
-    return _deindent_source
diff --git a/tests/test_actual_test_runs.py b/tests/test_actual_test_runs.py
index 04bec22..cbbc5a2 100644
--- a/tests/test_actual_test_runs.py
+++ b/tests/test_actual_test_runs.py
@@ -1,12 +1,13 @@
 # -*- coding: utf-8 -*-
 import collections
 import re
+import textwrap
 
 import pytest
 
 
 @pytest.fixture
-def tmp_tree_of_tests(testdir, deindent_source):
+def tmp_tree_of_tests(testdir):
     """
     Creates a directory structure:
         tmpdir/
@@ -24,7 +25,7 @@ def tmp_tree_of_tests(testdir, deindent_source):
     sup = testdir.mkpydir("shallow_tests")
 
     sup.join("test_a.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         def test_a1():
             assert False
         def test_a2():
@@ -35,7 +36,7 @@ def test_a3():
     )
 
     sup.join("test_ax.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         def test_ax1():
             assert True
         def test_ax2():
@@ -48,7 +49,7 @@ def test_ax3():
     sub = testdir.mkpydir("shallow_tests/deep_tests")
 
     sub.join("test_b.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         def test_b1():
             assert True
         def test_b2():
@@ -59,14 +60,14 @@ def test_b3():
     )
 
     sub.join("test_c.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         def test_c1():
             assert True
     """)
     )
 
     sub.join("test_d.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         def test_d1():
             assert True
         def test_d2():
@@ -75,7 +76,7 @@ def test_d2():
     )
 
     sub.join("test_e.py").write(
-        deindent_source("""
+        textwrap.dedent("""
         from unittest import TestCase
         class EeTest(TestCase):
             def test_ee1(self):
diff --git a/tests/test_doctests.py b/tests/test_doctests.py
index 90f6b02..443b9b7 100644
--- a/tests/test_doctests.py
+++ b/tests/test_doctests.py
@@ -1,9 +1,11 @@
 # -*- coding: utf-8 -*-
+import textwrap
+
 import pytest
 
 
 @pytest.fixture
-def tmp_tree_of_tests(testdir, deindent_source):
+def tmp_tree_of_tests(testdir):
     """
     Creates a directory structure:
         tmpdir/
@@ -15,7 +17,7 @@ def tmp_tree_of_tests(testdir, deindent_source):
     utils_package.join("__init__.py").write("")
 
     utils_package.join("foo.py").write(
-        deindent_source('''
+        textwrap.dedent('''
         def add(a, b):
             """
             >>> add(1, 1)