diff --git a/test/conftest.py b/test/conftest.py
new file mode 100644
index 0000000..e9ec787
--- /dev/null
+++ b/test/conftest.py
@@ -0,0 +1,10 @@
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def mock_env(monkeypatch):
+    fixtures = Path(__file__).parent / 'fixtures'
+    monkeypatch.setenv('CROAKER_ROOT', str(fixtures))
+    monkeypatch.setenv('MEDIA_GLOB', '*.mp3,*.foo,*.bar')
diff --git a/test/test_playlist.py b/test/test_playlist.py
index 7277530..83c1c20 100644
--- a/test/test_playlist.py
+++ b/test/test_playlist.py
@@ -1,4 +1,3 @@
-from pathlib import Path
 from unittest.mock import MagicMock
 
 import pytest
@@ -6,12 +5,6 @@ import pytest
 import croaker.playlist
 import croaker.path
 
-@pytest.fixture(autouse=True)
-def mock_env(monkeypatch):
-    fixtures = Path(__file__).parent / 'fixtures'
-    monkeypatch.setenv('CROAKER_ROOT', str(fixtures))
-    monkeypatch.setenv('MEDIA_GLOB', '*.mp3,*.foo,*.bar')
-
 
 def test_playlist_loading():
     pl = croaker.playlist.Playlist(name='test_playlist')
diff --git a/test/test_transcoder.py b/test/test_transcoder.py
new file mode 100644
index 0000000..a098c11
--- /dev/null
+++ b/test/test_transcoder.py
@@ -0,0 +1,25 @@
+from unittest.mock import MagicMock
+
+import ffmpeg
+import pytest
+
+from croaker import playlist
+from croaker import transcoder
+
+
+@pytest.mark.parametrize('suffix, expected', [
+    ('.mp3', b''),
+    ('.foo', b'transcoding!\n'),
+])
+def test_transcoder_open(monkeypatch, suffix, expected):
+    monkeypatch.setattr(transcoder, 'ffmpeg', MagicMock(spec=ffmpeg, **{
+        'input.return_value.'
+        'output.return_value.'
+        'global_args.return_value.'
+        'compile.return_value': ['echo', 'transcoding!'],
+    }))
+
+    pl = playlist.Playlist(name='test_playlist')
+    track = [t for t in pl.tracks if t.suffix == suffix][0]
+    with transcoder.open(track) as handle:
+        assert handle.read() == expected