diff --git a/chainladder/core/io.py b/chainladder/core/io.py
index 127c1f77..b72f0d1b 100644
--- a/chainladder/core/io.py
+++ b/chainladder/core/io.py
@@ -1,11 +1,14 @@
+"""
+Support Triangle I/O capabilities.
+"""
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at https://mozilla.org/MPL/2.0/.
+import dill
+import json
 import pandas as pd
+
 from sklearn.base import BaseEstimator
-import json
-import joblib
-import dill
 
 
 class TriangleIO:
diff --git a/chainladder/utils/tests/test_utilities.py b/chainladder/utils/tests/test_utilities.py
index c296507e..9c4615b2 100644
--- a/chainladder/utils/tests/test_utilities.py
+++ b/chainladder/utils/tests/test_utilities.py
@@ -420,6 +420,42 @@ def test_read_pickle_triangle(raa: Triangle, tmp_path: Path) -> None:
     assert cl.read_pickle(str(pkl_path)) == raa
 
 
+def test_triangle_to_pickle(
+        raa: Triangle,
+        clrd: Triangle,
+        tmp_path: Path
+) -> None:
+    """
+    Dump a pickle of a triangle and read it back in. The read-in triangle should
+    equal the one that was dumped.
+
+    Parameters
+    ----------
+    raa: Triangle
+        The raa sample data set Triangle.
+    clrd: Triangle
+        The clrd sample data set Triangle.
+    tmp_path: Path
+        The builtin pytest tmp_path fixture, provides a temporary path to dump the pickle to.
+
+    Returns
+    -------
+    None
+
+    """
+    # Single-dimension case.
+    raa_path = tmp_path / "raa.pkl"
+    raa.to_pickle(str(raa_path))
+    assert raa_path.is_file()
+    assert cl.read_pickle(str(raa_path)) == raa
+
+    # Multidimensional case.
+    clrd_path = tmp_path / "clrd.pkl"
+    clrd.to_pickle(str(clrd_path))
+    assert clrd_path.is_file()
+    assert cl.read_pickle(str(clrd_path)) == clrd
+
+
 def test_read_pickle_estimator(raa: Triangle, tmp_path: Path) -> None:
     """
     Create an estimator, dump a pickle of it, and then read it back in. The ingested pickle should result