diff --git a/src/monty/multiprocessing.py b/src/monty/multiprocessing.py
index 4b7c720f2..26def1e8f 100644
--- a/src/monty/multiprocessing.py
+++ b/src/monty/multiprocessing.py
@@ -5,7 +5,10 @@
 from __future__ import annotations
 
 from multiprocessing import Pool
-from typing import Callable, Iterable
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import Callable, Iterable
 
 try:
     from tqdm.autonotebook import tqdm
diff --git a/src/monty/string.py b/src/monty/string.py
index 1a56debca..1cc950afd 100644
--- a/src/monty/string.py
+++ b/src/monty/string.py
@@ -4,10 +4,10 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Iterable, cast
+from typing import TYPE_CHECKING, cast
 
 if TYPE_CHECKING:
-    from typing import Any, Union
+    from typing import Any, Iterable, Union
 
 
 def remove_non_ascii(s: str) -> str:
diff --git a/tests/test_design_patterns.py b/tests/test_design_patterns.py
index 6e3766f4c..9f0068474 100644
--- a/tests/test_design_patterns.py
+++ b/tests/test_design_patterns.py
@@ -3,12 +3,15 @@
 import gc
 import pickle
 import weakref
-from typing import Any
+from typing import TYPE_CHECKING
 
 import pytest
 
 from monty.design_patterns import cached_class, singleton
 
+if TYPE_CHECKING:
+    from typing import Any
+
 
 class TestSingleton:
     def test_singleton(self):
diff --git a/tests/test_dev.py b/tests/test_dev.py
index 109e7bc6e..866119e5b 100644
--- a/tests/test_dev.py
+++ b/tests/test_dev.py
@@ -3,12 +3,16 @@
 import unittest
 import warnings
 from dataclasses import dataclass
-from unittest.mock import patch
 
 import pytest
 
 from monty.dev import deprecated, install_excepthook, requires
 
+try:
+    from IPython.core import ultratb
+except ImportError:
+    ultratb = None
+
 # Set all warnings to always be triggered.
 warnings.simplefilter("always")
 
@@ -200,5 +204,6 @@ def use_import_error():
         use_import_error()
 
 
+@pytest.mark.skipif(ultratb is None, reason="ipython is not installed")
 def test_install_except_hook():
     install_excepthook()
diff --git a/tests/test_files/test_settings.yaml b/tests/test_files/settings_for_test.yaml
similarity index 100%
rename from tests/test_files/test_settings.yaml
rename to tests/test_files/settings_for_test.yaml
diff --git a/tests/test_files/test_settings.yaml.gz b/tests/test_files/test_settings.yaml.gz
deleted file mode 100644
index c3926e151..000000000
Binary files a/tests/test_files/test_settings.yaml.gz and /dev/null differ
diff --git a/tests/test_functools.py b/tests/test_functools.py
index 120e6bd75..40c3f88ce 100644
--- a/tests/test_functools.py
+++ b/tests/test_functools.py
@@ -2,7 +2,6 @@
 
 import platform
 import time
-import unittest
 
 import pytest
 
@@ -620,7 +619,7 @@ def return_none(self):
 
 
 class TestTimeout:
-    @unittest.skipIf(platform.system() == "Windows", "Skip on windows")
+    @pytest.mark.skipif(platform.system() == "Windows", reason="Skip on windows")
     def test_with(self):
         try:
             with timeout(1, "timeout!"):
diff --git a/tests/test_itertools.py b/tests/test_itertools.py
index 470db7c6e..89bcfa29b 100644
--- a/tests/test_itertools.py
+++ b/tests/test_itertools.py
@@ -1,5 +1,3 @@
-# Copyright (c) Materials Virtual Lab.
-# Distributed under the terms of the BSD License.
 from __future__ import annotations
 
 from monty.itertools import chunks, iterator_from_slice
diff --git a/tests/test_json.py b/tests/test_json.py
index 2403c1649..48caa06bc 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -48,6 +48,12 @@
 except ImportError:
     ObjectId = None
 
+try:
+    from bson import json_util
+except ImportError:
+    json_util = None
+
+
 TEST_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "test_files")
 
 
@@ -969,7 +975,7 @@ def test_redirect(self):
             json.loads(json.dumps(d2), cls=MontyDecoder)
 
     def test_redirect_settings_file(self):
-        data = _load_redirect(os.path.join(TEST_DIR, "test_settings.yaml"))
+        data = _load_redirect(os.path.join(TEST_DIR, "settings_for_test.yaml"))
         assert data == {
             "old_module": {
                 "old_class": {"@class": "new_class", "@module": "new_module"}
@@ -1255,9 +1261,8 @@ def test_pint(self):
         assert isinstance(qty, pint.Quantity)
 
     @pytest.mark.skipif(ObjectId is None, reason="bson not present")
+    @pytest.mark.skipif(json_util is None, reason="pymongo not present")
     def test_extended_json(self):
-        from bson import json_util
-
         ext_json_dict = {
             "datetime": datetime.datetime.now(datetime.timezone.utc),
             "NaN": float("NaN"),
diff --git a/tests/test_multiprocessing.py b/tests/test_multiprocessing.py
index e507c321b..dd00cf486 100644
--- a/tests/test_multiprocessing.py
+++ b/tests/test_multiprocessing.py
@@ -2,9 +2,17 @@
 
 from math import sqrt
 
-from monty.multiprocessing import imap_tqdm
+import pytest
 
+try:
+    from tqdm.autonotebook import tqdm
 
+    from monty.multiprocessing import imap_tqdm
+except ImportError:
+    tqdm = None
+
+
+@pytest.mark.skipif(tqdm is None, reason="tqdm not installed")
 def test_imap_tqdm():
     results = imap_tqdm(4, sqrt, range(10_000))
     assert len(results) == 10_000
diff --git a/tests/test_os.py b/tests/test_os.py
index f0225f70c..fea8648ff 100644
--- a/tests/test_os.py
+++ b/tests/test_os.py
@@ -1,13 +1,16 @@
 from __future__ import annotations
 
 import os
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 import pytest
 
 from monty.os import cd, makedirs_p
 from monty.os.path import find_exts, zpath
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 MODULE_DIR = os.path.dirname(__file__)
 TEST_DIR = os.path.join(MODULE_DIR, "test_files")
 
diff --git a/tests/test_serialization.py b/tests/test_serialization.py
index abe14e2a3..0a2d99969 100644
--- a/tests/test_serialization.py
+++ b/tests/test_serialization.py
@@ -3,7 +3,6 @@
 import glob
 import json
 import os
-import unittest
 
 import pytest
 
@@ -66,7 +65,7 @@ def test_dumpfn_loadfn(self):
         with pytest.raises(TypeError):
             loadfn("monte_test.txt", fmt="garbage")
 
-    @unittest.skipIf(msgpack is None, "msgpack-python not installed.")
+    @pytest.mark.skipif(msgpack is None, reason="msgpack-python not installed.")
     def test_mpk(self):
         d = {"hello": "world"}
 
diff --git a/tests/test_shutil.py b/tests/test_shutil.py
index dc18c3588..4adc4804e 100644
--- a/tests/test_shutil.py
+++ b/tests/test_shutil.py
@@ -4,7 +4,6 @@
 import platform
 import shutil
 import tempfile
-import unittest
 from gzip import GzipFile
 from pathlib import Path
 
@@ -189,7 +188,7 @@ def teardown_method(self):
 
 
 class TestRemove:
-    @unittest.skipIf(platform.system() == "Windows", "Skip on windows")
+    @pytest.mark.skipif(platform.system() == "Windows", reason="Skip on windows")
     def test_remove_file(self):
         tempdir = tempfile.mkdtemp(dir=TEST_DIR)
         tempf = tempfile.mkstemp(dir=tempdir)[1]
@@ -197,13 +196,13 @@ def test_remove_file(self):
         assert not os.path.isfile(tempf)
         shutil.rmtree(tempdir)
 
-    @unittest.skipIf(platform.system() == "Windows", "Skip on windows")
+    @pytest.mark.skipif(platform.system() == "Windows", reason="Skip on windows")
     def test_remove_folder(self):
         tempdir = tempfile.mkdtemp(dir=TEST_DIR)
         remove(tempdir)
         assert not os.path.isdir(tempdir)
 
-    @unittest.skipIf(platform.system() == "Windows", "Skip on windows")
+    @pytest.mark.skipif(platform.system() == "Windows", reason="Skip on windows")
     def test_remove_symlink(self):
         tempdir = tempfile.mkdtemp(dir=TEST_DIR)
         tempf = tempfile.mkstemp(dir=tempdir)[1]
@@ -216,7 +215,7 @@ def test_remove_symlink(self):
         assert not os.path.islink(templink)
         remove(tempdir)
 
-    @unittest.skipIf(platform.system() == "Windows", "Skip on windows")
+    @pytest.mark.skipif(platform.system() == "Windows", reason="Skip on windows")
     def test_remove_symlink_follow(self):
         tempdir = tempfile.mkdtemp(dir=TEST_DIR)
         tempf = tempfile.mkstemp(dir=tempdir)[1]
diff --git a/tests/test_string.py b/tests/test_string.py
index a015e5a3a..0167d7f20 100644
--- a/tests/test_string.py
+++ b/tests/test_string.py
@@ -1,7 +1,3 @@
-"""
-TODO: Modify unittest doc.
-"""
-
 from __future__ import annotations
 
 import random
@@ -10,7 +6,7 @@
 
 
 def test_remove_non_ascii():
-    s = "".join(chr(random.randint(0, 127)) for i in range(10))
-    s += "".join(chr(random.randint(128, 150)) for i in range(10))
+    s = "".join(chr(random.randint(0, 127)) for _ in range(10))
+    s += "".join(chr(random.randint(128, 150)) for _ in range(10))
     clean = remove_non_ascii(s)
     assert len(clean) == 10
diff --git a/tests/test_termcolor.py b/tests/test_termcolor.py
index 6a54ed4ac..d0da543cc 100644
--- a/tests/test_termcolor.py
+++ b/tests/test_termcolor.py
@@ -1,7 +1,3 @@
-"""
-TODO: Modify unittest doc.
-"""
-
 from __future__ import annotations
 
 import os