Fix unittest.

tests/test_publish.py

@@ -10,6 +10,7 @@ import sys
 import platform
 import shutil
 from collections import Counter
+from importlib.metadata import version
 from subprocess import run, CalledProcessError
 from unittest.mock import patch
 import matplotlib.pyplot as plt
@@ -348,16 +349,18 @@ class TestPublish(unittest.TestCase):
         This test only works if called from the parent directory, since the path to the
         file to test the behaviour has to be specified correctly.
         """
+        mpl_version = version("matplotlib")
         expected_modules = [
             "shutil\n",
             "unittest\n",
             "subprocess\n",
             "platform\n",
-            "matplotlib==3.6.2\n",
+            f"matplotlib=={mpl_version}\n",
             "os\n",
             "sys\n",
             "plotid\n",
             "collections\n",
+            "importlib\n",
         ]
         folder = os.path.join("test_parent", "test_dst_folder")
         os.mkdir(folder)