diff --git a/test/fuzzing/run-draw-fuzzer-tests.py b/test/fuzzing/run-draw-fuzzer-tests.py
index 4085649a4..b0a2fd0ea 100755
--- a/test/fuzzing/run-draw-fuzzer-tests.py
+++ b/test/fuzzing/run-draw-fuzzer-tests.py
@@ -1,24 +1,6 @@
 #!/usr/bin/env python3
 
-import sys, os, subprocess, tempfile, threading
-
-
-def which (program):
-	# https://stackoverflow.com/a/377028
-	def is_exe (fpath):
-		return os.path.isfile (fpath) and os.access (fpath, os.X_OK)
-
-	fpath, _ = os.path.split (program)
-	if fpath:
-		if is_exe (program):
-			return program
-	else:
-		for path in os.environ["PATH"].split (os.pathsep):
-			exe_file = os.path.join (path, program)
-			if is_exe (exe_file):
-				return exe_file
-
-	return None
+import sys, os, subprocess, tempfile, threading, shutil
 
 
 def cmd (command):
@@ -74,7 +56,7 @@ fails = 0
 libtool = os.environ.get ('LIBTOOL')
 valgrind = None
 if os.environ.get ('RUN_VALGRIND', ''):
-	valgrind = which ('valgrind')
+	valgrind = shutil.which ('valgrind')
 	if valgrind is None:
 		print ("""Valgrind requested but not found.""")
 		sys.exit (1)
diff --git a/test/fuzzing/run-shape-fuzzer-tests.py b/test/fuzzing/run-shape-fuzzer-tests.py
index a44065f0f..011b986a4 100755
--- a/test/fuzzing/run-shape-fuzzer-tests.py
+++ b/test/fuzzing/run-shape-fuzzer-tests.py
@@ -1,24 +1,6 @@
 #!/usr/bin/env python3
 
-import sys, os, subprocess, tempfile, threading
-
-
-def which (program):
-	# https://stackoverflow.com/a/377028
-	def is_exe (fpath):
-		return os.path.isfile (fpath) and os.access (fpath, os.X_OK)
-
-	fpath, _ = os.path.split (program)
-	if fpath:
-		if is_exe (program):
-			return program
-	else:
-		for path in os.environ["PATH"].split (os.pathsep):
-			exe_file = os.path.join (path, program)
-			if is_exe (exe_file):
-				return exe_file
-
-	return None
+import sys, os, subprocess, tempfile, threading, shutil
 
 
 def cmd (command):
@@ -74,7 +56,7 @@ fails = 0
 libtool = os.environ.get ('LIBTOOL')
 valgrind = None
 if os.environ.get ('RUN_VALGRIND', ''):
-	valgrind = which ('valgrind')
+	valgrind = shutil.which ('valgrind')
 	if valgrind is None:
 		print ("""Valgrind requested but not found.""")
 		sys.exit (1)
diff --git a/test/fuzzing/run-subset-fuzzer-tests.py b/test/fuzzing/run-subset-fuzzer-tests.py
index 071c64428..a29f44ea2 100755
--- a/test/fuzzing/run-subset-fuzzer-tests.py
+++ b/test/fuzzing/run-subset-fuzzer-tests.py
@@ -1,24 +1,6 @@
 #!/usr/bin/env python3
 
-import sys, os, subprocess, tempfile, threading
-
-
-def which(program):
-	# https://stackoverflow.com/a/377028
-	def is_exe(fpath):
-		return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
-
-	fpath, _ = os.path.split(program)
-	if fpath:
-		if is_exe(program):
-			return program
-	else:
-		for path in os.environ["PATH"].split(os.pathsep):
-			exe_file = os.path.join(path, program)
-			if is_exe(exe_file):
-				return exe_file
-
-	return None
+import sys, os, subprocess, tempfile, threading, shutil
 
 
 def cmd(command):
@@ -74,7 +56,7 @@ fails = 0
 libtool = os.environ.get('LIBTOOL')
 valgrind = None
 if os.environ.get('RUN_VALGRIND', ''):
-	valgrind = which ('valgrind')
+	valgrind = shutil.which ('valgrind')
 	if valgrind is None:
 		print ("""Valgrind requested but not found.""")
 		sys.exit (1)
diff --git a/test/subset/run-tests.py b/test/subset/run-tests.py
index 7d183507b..1593e620a 100755
--- a/test/subset/run-tests.py
+++ b/test/subset/run-tests.py
@@ -10,28 +10,12 @@ import re
 import subprocess
 import sys
 import tempfile
+import shutil
 
 from subset_test_suite import SubsetTestSuite
 
-# https://stackoverflow.com/a/377028
-def which (program):
-	def is_exe (fpath):
-		return os.path.isfile (fpath) and os.access (fpath, os.X_OK)
-
-	fpath, _ = os.path.split (program)
-	if fpath:
-		if is_exe (program):
-			return program
-	else:
-		for path in os.environ["PATH"].split (os.pathsep):
-			exe_file = os.path.join (path, program)
-			if is_exe (exe_file):
-				return exe_file
-
-	return None
-
-fonttools = which ("fonttools")
-ots_sanitize = which ("ots-sanitize")
+fonttools = shutil.which ("fonttools")
+ots_sanitize = shutil.which ("ots-sanitize")
 
 if not fonttools:
 	print ("fonttools is not present, skipping test.")