diff --git a/conftest.py b/conftest.py
new file mode 100644
index 00000000..7972d82a
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,10 @@
+import os
+from pathlib import Path
+import pytest
+
+
+@pytest.fixture
+def temp_output_dir(tmp_path: Path) -> str:
+    # Append path separator so that value is recognized as a directory when
+    # passed to `output_prefix`
+    return str(tmp_path) + os.sep
diff --git a/test/test_execution.py b/test/test_execution.py
index 85d28ac0..55ecd35b 100644
--- a/test/test_execution.py
+++ b/test/test_execution.py
@@ -1,21 +1,12 @@
 from __future__ import annotations
-import os
 from pathlib import Path
 from unittest import mock
-import pytest
 from utils import assert_files
 from duct.__main__ import Arguments, Outputs, RecordTypes, execute
 
 TEST_SCRIPT = str(Path(__file__).with_name("data") / "test_script.py")
 
 
-@pytest.fixture
-def temp_output_dir(tmp_path: Path) -> str:
-    # Append path separator so that value is recognized as a directory when
-    # passed to `output_prefix`
-    return str(tmp_path) + os.sep
-
-
 def test_sanity_green(temp_output_dir: str) -> None:
     args = Arguments(
         command="echo",
diff --git a/test/test_prepare_outputs.py b/test/test_prepare_outputs.py
index 08455ea5..67f041da 100644
--- a/test/test_prepare_outputs.py
+++ b/test/test_prepare_outputs.py
@@ -6,67 +6,66 @@
 
 
 @patch("sys.stdout", new_callable=MockStream)
-def test_prepare_outputs_all_stdout(mock_stdout: MockStream) -> None:
-    output_prefix = "test_outputs_"
+def test_prepare_outputs_all_stdout(
+    mock_stdout: MockStream, temp_output_dir: str
+) -> None:
     with patch("duct.__main__.TailPipe") as mock_tee_stream, patch(
         "builtins.open", new_callable=MagicMock
     ) as mock_open:
         mock_tee_stream.return_value.start = MagicMock()
         stdout, stderr = prepare_outputs(
-            Outputs.ALL, Outputs.STDOUT, output_prefix, clobber=True
+            Outputs.ALL, Outputs.STDOUT, temp_output_dir, clobber=True
         )
         mock_tee_stream.assert_called_with(
-            f"{output_prefix}stdout", buffer=mock_stdout.buffer
+            f"{temp_output_dir}stdout", buffer=mock_stdout.buffer
         )
         assert stdout == mock_tee_stream.return_value
         assert stderr == mock_open.return_value
 
 
 @patch("sys.stderr", new_callable=MockStream)
-def test_prepare_outputs_all_stderr(mock_stderr: MockStream) -> None:
-    output_prefix = "test_outputs_"
+def test_prepare_outputs_all_stderr(
+    mock_stderr: MockStream, temp_output_dir: str
+) -> None:
     with patch("duct.__main__.TailPipe") as mock_tee_stream, patch(
         "builtins.open", new_callable=MagicMock
     ) as mock_open:
         mock_tee_stream.return_value.start = MagicMock()
         stdout, stderr = prepare_outputs(
-            Outputs.ALL, Outputs.STDERR, output_prefix, clobber=True
+            Outputs.ALL, Outputs.STDERR, temp_output_dir, clobber=True
         )
         mock_tee_stream.assert_called_with(
-            f"{output_prefix}stderr", buffer=mock_stderr.buffer
+            f"{temp_output_dir}stderr", buffer=mock_stderr.buffer
         )
         assert stdout == mock_open.return_value
         assert stderr == mock_tee_stream.return_value
 
 
-def test_prepare_outputs_all_none() -> None:
-    output_prefix = "test_outputs_"
+def test_prepare_outputs_all_none(temp_output_dir: str) -> None:
     with patch("builtins.open", new_callable=MagicMock) as mock_open:
         stdout, stderr = prepare_outputs(
-            Outputs.ALL, Outputs.NONE, output_prefix, clobber=True
+            Outputs.ALL, Outputs.NONE, temp_output_dir, clobber=True
         )
         calls = [
-            call(f"{output_prefix}stdout", "w"),
-            call(f"{output_prefix}stderr", "w"),
+            call(f"{temp_output_dir}stdout", "w"),
+            call(f"{temp_output_dir}stderr", "w"),
         ]
         mock_open.assert_has_calls(calls, any_order=True)
         assert stdout == mock_open.return_value
         assert stderr == mock_open.return_value
 
 
-def test_prepare_outputs_none_stdout() -> None:
-    output_prefix = "test_outputs_"
+def test_prepare_outputs_none_stdout(temp_output_dir: str) -> None:
     stdout, stderr = prepare_outputs(
-        Outputs.NONE, Outputs.STDOUT, output_prefix, clobber=True
+        Outputs.NONE, Outputs.STDOUT, temp_output_dir, clobber=True
     )
     assert stdout is None
     assert stderr == subprocess.DEVNULL
 
 
-def test_prepare_outputs_none_stderr() -> None:
-    output_prefix = "test_outputs_"
+def test_prepare_outputs_none_stderr(temp_output_dir: str) -> None:
     stdout, stderr = prepare_outputs(
-        Outputs.NONE, Outputs.STDERR, output_prefix, clobber=True
+        Outputs.NONE, Outputs.STDERR, temp_output_dir, clobber=True
     )
     assert stderr is None
     assert stdout == subprocess.DEVNULL
@@ -75,18 +74,19 @@ def test_prepare_outputs_none_stderr() -> None:
 @patch("sys.stderr", new_callable=MockStream)
 @patch("sys.stdout", new_callable=MockStream)
 def test_prepare_outputs_all_all(
-    mock_stdout: MockStream, mock_stderr: MockStream
+    mock_stdout: MockStream,
+    mock_stderr: MockStream,
+    temp_output_dir: str,
 ) -> None:
-    output_prefix = "test_outputs_"
     with patch("duct.__main__.TailPipe") as mock_tee_stream:
         mock_tee_stream.return_value.start = MagicMock()
         stdout, stderr = prepare_outputs(
-            Outputs.ALL, Outputs.ALL, output_prefix, clobber=True
+            Outputs.ALL, Outputs.ALL, temp_output_dir, clobber=True
         )
         assert stdout == mock_tee_stream.return_value
         assert stderr == mock_tee_stream.return_value
         calls = [
-            call(f"{output_prefix}stdout", buffer=mock_stdout.buffer),
-            call(f"{output_prefix}stderr", buffer=mock_stderr.buffer),
+            call(f"{temp_output_dir}stdout", buffer=mock_stdout.buffer),
+            call(f"{temp_output_dir}stderr", buffer=mock_stderr.buffer),
         ]
         mock_tee_stream.assert_has_calls(calls, any_order=True)