diff --git a/mne/tests/test_epochs.py b/mne/tests/test_epochs.py
index cb5f9cf225f..20c31e12a82 100644
--- a/mne/tests/test_epochs.py
+++ b/mne/tests/test_epochs.py
@@ -4,7 +4,6 @@
 #
 # License: BSD-3-Clause
 
-import os
 import pickle
 from copy import deepcopy
 from datetime import timedelta
@@ -1477,19 +1476,22 @@ def test_epochs_io_preload(tmp_path, preload):
 
 
 @pytest.fixture(params=[True, False], ids=["metadata", "no_metadata"])
-def metadata(request):
+def is_add_metadata(request):
+    """Weither to create metadata in epochs fixture."""
     return request.param
 
 
 @pytest.fixture(params=[True, False], ids=["concat", "no_concat"])
-def concat(request):
+def is_concat(request):
+    """Weither to create concatenated version of epochs."""
     return request.param
 
 
 @pytest.fixture
-def epochs(n_epochs, metadata, concat):
+def fake_epochs(n_epochs, is_add_metadata, is_concat):
+    """Epochs object to test split naming."""
     n_ch, fs = 100, 1000.0
-    if metadata:
+    if is_add_metadata:
         pytest.importorskip("pandas")
     # See gh-5102
     n_times = int(round(fs * (n_epochs + 1)))
@@ -1497,7 +1499,7 @@ def epochs(n_epochs, metadata, concat):
     raw = mne.io.RawArray(raw_data, mne.create_info(n_ch, fs))
     events = mne.make_fixed_length_events(raw, 1)
     epochs = mne.Epochs(raw, events)
-    if metadata:
+    if is_add_metadata:
         from pandas import DataFrame
 
         junk = ["*" * 10000 for _ in range(len(events))]
@@ -1510,7 +1512,7 @@ def epochs(n_epochs, metadata, concat):
         )
         epochs.metadata = metadata
     epochs.drop_bad()
-    if concat:
+    if is_concat:
         epochs = concatenate_epochs([epochs[ii] for ii in range(len(epochs))])
     assert len(epochs) == n_epochs
     return epochs
@@ -1521,18 +1523,18 @@ def epochs(n_epochs, metadata, concat):
 )
 @pytest.mark.parametrize("preload", [True, False], ids=["preload", "no_preload"])
 def test_split_saving_and_loading_back(
-    tmp_path, split_size, epochs, expected_n_splits, preload
+    tmp_path, split_size, fake_epochs, expected_n_splits, preload
 ):
     """Test saving split epochs."""
     dst = tmp_path / "test-epo.fif"
     split_size_bytes = _get_split_size(split_size)
 
-    epochs.save(dst, split_size=split_size)
+    fake_epochs.save(dst, split_size=split_size)
     loaded_epochs = mne.read_epochs(dst, preload=preload)
 
     _assert_splits(dst, expected_n_splits, split_size_bytes)
-    assert_allclose(loaded_epochs.get_data(), epochs.get_data())
-    assert_array_equal(epochs.events, loaded_epochs.events)
+    assert_allclose(loaded_epochs.get_data(), fake_epochs.get_data())
+    assert_array_equal(fake_epochs.events, loaded_epochs.events)
 
 
 @pytest.mark.parametrize(
@@ -1552,16 +1554,19 @@ def test_split_saving_and_loading_back(
 )
 def test_split_naming(
     tmp_path,
-    epochs,
+    fake_epochs,
     split_size,
     expected_n_splits,
     dst_fname,
     split_naming,
     split_fname_fn,
 ):
+    """Save epochs with small split_size and check the split filenames."""
     dst = tmp_path / dst_fname
 
-    epochs.save(dst, split_size=split_size, split_naming=split_naming, verbose=True)
+    fake_epochs.save(
+        dst, split_size=split_size, split_naming=split_naming, verbose=True
+    )
 
     assert expected_n_splits >= 2, "Need at least 2 splits for saved epochs."
     assert len(list(tmp_path.iterdir())) == expected_n_splits
@@ -1579,13 +1584,13 @@ def test_split_naming(
     ],
 )
 def test_saved_fname_no_splitting(
-    tmp_path, epochs, dst_fname, split_naming, split_1_fname
+    tmp_path, fake_epochs, dst_fname, split_naming, split_1_fname
 ):
     """Test saved fname doesn't get split suffix when splitting not needed."""
     dst_fpath = tmp_path / dst_fname
     split_1_fpath = tmp_path / split_1_fname
 
-    epochs.save(dst_fpath, split_naming=split_naming, verbose=True, split_size="2GB")
+    fake_epochs.save(dst_fpath, split_naming=split_naming, verbose=True, split_size="2GB")
 
     assert dst_fpath.is_file()
     assert not split_1_fpath.is_file()
@@ -1593,12 +1598,13 @@ def test_saved_fname_no_splitting(
 
 @pytest.mark.parametrize("n_epochs", [5])
 @pytest.mark.parametrize("split_naming", ["neuromag", "bids"])
-def test_saving_fails_with_not_permitted_overwrite(tmp_path, epochs, split_naming):
+def test_saving_fails_with_not_permitted_overwrite(tmp_path, fake_epochs, split_naming):
+    """Check exception is raised when overwriting without explicit flag."""
     dst_fpath = tmp_path / "test-epo.fif"
-    epochs.save(dst_fpath, split_naming=split_naming, verbose=True)
+    fake_epochs.save(dst_fpath, split_naming=split_naming, verbose=True)
 
     with pytest.raises(FileExistsError, match="Destination file"):
-        epochs.save(dst_fpath, split_naming=split_naming, verbose=True)
+        fake_epochs.save(dst_fpath, split_naming=split_naming, verbose=True)
 
 
 @pytest.mark.slowtest