diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
new file mode 100644
index 00000000..e4b05bc1
--- /dev/null
+++ b/.github/workflows/test.yaml
@@ -0,0 +1,37 @@
+name: Python Tests
+
+on:
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    container:
+      image: ubuntu:22.04
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+
+      - name: Install binary dependencies
+        run: apt update && apt install -y git bzr fossil mercurial subversion
+        env:
+          DEBIAN_FRONTEND: noninteractive
+
+      - name: Install Python dependencies
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Run Python Tests
+        run: python -m pytest --junitxml=test-results.xml
+
+      - name: Publish Test Report
+        uses: mikepenz/action-junit-report@v4
+        if: success() || failure() # always run even if the previous step fails
+        with:
+          report_paths: 'test-results.xml'
diff --git a/powerline_shell/segments/uptime.py b/powerline_shell/segments/uptime.py
index 1c030611..4108ee60 100644
--- a/powerline_shell/segments/uptime.py
+++ b/powerline_shell/segments/uptime.py
@@ -1,19 +1,19 @@
 import subprocess
 import re
-from ..utils import BasicSegment, decode
+from ..utils import BasicSegment
 
 
 class Segment(BasicSegment):
     def add_to_powerline(self):
         powerline = self.powerline
         try:
-            output = decode(subprocess.check_output(['uptime'], stderr=subprocess.STDOUT))
-            raw_uptime = re.search('(?<=up).+(?=,\s+\d+\s+user)', output).group(0)
-            day_search = re.search('\d+(?=\s+day)', output)
+            output = subprocess.check_output(['uptime'], stderr=subprocess.STDOUT)
+            raw_uptime = re.search(r'(?<=up).+(?=,\s+\d+\s+user)', output).group(0)
+            day_search = re.search(r'\d+(?=\s+day)', output)
             days = '' if not day_search else '%sd ' % day_search.group(0)
-            hour_search =  re.search('\d{1,2}(?=\:)', raw_uptime)
+            hour_search = re.search(r'\d{1,2}(?=\:)', raw_uptime)
             hours = '' if not hour_search else '%sh ' %  hour_search.group(0)
-            minutes =  re.search('(?<=\:)\d{1,2}|\d{1,2}(?=\s+min)', raw_uptime).group(0)
+            minutes = re.search(r'(?<=\:)\d{1,2}|\d{1,2}(?=\s+min)', raw_uptime).group(0)
             uptime = u' %s%s%sm \u2191 ' % (days, hours, minutes)
             powerline.append(uptime, powerline.theme.CWD_FG, powerline.theme.PATH_BG)
         except OSError:
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 59d5eef7..b440b50a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,3 @@
-nose>=1.3.7
-mock>=1.3.0
 sh>=1.11
-parameterized>=0.6.1
\ No newline at end of file
+parameterized>=0.6.1
+pytest
diff --git a/test/color_compliment_test.py b/test/color_compliment_test.py
index 47f72d07..e022c1ed 100644
--- a/test/color_compliment_test.py
+++ b/test/color_compliment_test.py
@@ -7,7 +7,7 @@
 def build_inputs():
     
     # Build 768 hex/rgb values to test against getOppositeColor
-    input_bytes = map(hex, xrange(pow(2,8)))
+    input_bytes = list(map(hex, range(pow(2,8))))
 
     input_list = []
     for x in input_bytes:
diff --git a/test/cwd_test.py b/test/cwd_test.py
index ed52dc36..00ae5faf 100644
--- a/test/cwd_test.py
+++ b/test/cwd_test.py
@@ -1,8 +1,11 @@
 import unittest
-import mock
+from unittest import mock
 import os
 import tempfile
 import shutil
+
+import sh
+
 import powerline_shell as p
 
 
@@ -33,9 +36,9 @@ def test_nonexistent_warns(self, warn, getenv):
     @mock.patch('powerline_shell.warn')
     def test_falls_back_to_getcwd(self, warn, getenv):
         getenv.return_value = None
-        os.chdir(self.dirname)
-        self.assertEqual(p.get_valid_cwd(), self.dirname)
-        self.assertEqual(warn.call_count, 0)
+        with sh.pushd(self.dirname):
+            self.assertEqual(p.get_valid_cwd(), self.dirname)
+            self.assertEqual(warn.call_count, 0)
 
     @mock.patch('os.getenv')
     @mock.patch('powerline_shell.warn')
@@ -44,10 +47,10 @@ def test_nonexistent_getcwd_warns(self, warn, getenv):
         getenv.return_value = None
 
         os.mkdir(subdir)
-        os.chdir(subdir)
-        os.rmdir(subdir)
+        with sh.pushd(subdir):
+            os.rmdir(subdir)
 
-        with self.assertRaises(SystemExit) as e:
-            p.get_valid_cwd()
+            with self.assertRaises(SystemExit) as e:
+                p.get_valid_cwd()
 
-        self.assertEqual(warn.call_count, 1)
+            self.assertEqual(warn.call_count, 1)
diff --git a/test/segments_test/bzr_test.py b/test/segments_test/bzr_test.py
index 73dbebae..813a41a4 100644
--- a/test/segments_test/bzr_test.py
+++ b/test/segments_test/bzr_test.py
@@ -1,5 +1,7 @@
 import unittest
-import mock
+from contextlib import ExitStack
+
+from unittest import mock
 import tempfile
 import shutil
 import sh
@@ -28,14 +30,20 @@ def setUp(self):
         })
 
         self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        sh.bzr("init-repo", ".")
-        sh.mkdir("trunk")
-        sh.cd("trunk")
-        sh.bzr("init")
+        with sh.pushd(self.dirname):
+            sh.bzr("init-repo", ".")
+            sh.mkdir("trunk")
+
+        with sh.pushd(self.dirname + "/trunk"):
+            sh.bzr("init")
+            sh.bzr("whoami", "--branch", '"Example <example@example.com>"')
 
         self.segment = bzr.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.dirname + "/trunk"))
+            self.addCleanup(stack.pop_all().close)
+
     def tearDown(self):
         shutil.rmtree(self.dirname)
 
@@ -45,9 +53,8 @@ def _add_and_commit(self, filename):
         sh.bzr("commit", "-m", "add file " + filename)
 
     def _checkout_new_branch(self, branch):
-        sh.cd("..")
-        sh.bzr("branch", "trunk", branch)
-        sh.cd(branch)
+        with sh.pushd(self.dirname):
+            sh.bzr("branch", "trunk", branch)
 
     @mock.patch("powerline_shell.utils.get_PATH")
     def test_bzr_not_installed(self, get_PATH):
@@ -71,12 +78,14 @@ def test_trunk(self):
     def test_different_branch(self):
         self._add_and_commit("foo")
         self._checkout_new_branch("bar")
-        self.segment.start()
-        self.segment.add_to_powerline()
-        self.assertEqual(self.powerline.append.call_args[0][0], " bar ")
+        with sh.pushd(self.dirname + "/bar"):
+            self.segment.start()
+            self.segment.add_to_powerline()
+            self.assertEqual(self.powerline.append.call_args[0][0], " bar ")
 
     @mock.patch('powerline_shell.segments.bzr._get_bzr_status')
     def test_all(self, check_output):
         for stdout, result in test_cases:
-            stats = bzr.parse_bzr_stats(stdout)
-            self.assertEquals(result, stats)
+            with sh.pushd(self.dirname + "/trunk"):
+                stats = bzr.parse_bzr_stats(stdout)
+                self.assertEqual(result, stats)
diff --git a/test/segments_test/fossil_test.py b/test/segments_test/fossil_test.py
index 34f914af..dd45b923 100644
--- a/test/segments_test/fossil_test.py
+++ b/test/segments_test/fossil_test.py
@@ -1,5 +1,8 @@
 import unittest
-import mock
+from contextlib import ExitStack
+from os import environ
+
+from unittest import mock
 import tempfile
 import shutil
 import sh
@@ -17,6 +20,7 @@
 
 class FossilTest(unittest.TestCase):
 
+    @mock.patch.dict(environ, {"USER": "root"})
     def setUp(self):
         self.powerline = mock.MagicMock()
         self.powerline.segment_conf.side_effect = dict_side_effect_fn({
@@ -24,12 +28,16 @@ def setUp(self):
         })
 
         self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        sh.fossil("init", "test.fossil")
-        sh.fossil("open", "test.fossil")
+        with sh.pushd(self.dirname):
+            sh.fossil("init", "test.fossil")
+            sh.fossil("open", "test.fossil")
 
         self.segment = fossil.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.dirname))
+            self.addCleanup(stack.pop_all().close)
+
     def tearDown(self):
         shutil.rmtree(self.dirname)
 
@@ -55,12 +63,14 @@ def test_non_fossil_directory(self):
         self.segment.add_to_powerline()
         self.assertEqual(self.powerline.append.call_count, 0)
 
+    @mock.patch.dict(environ, {"USER": "root"})
     def test_standard(self):
         self._add_and_commit("foo")
         self.segment.start()
         self.segment.add_to_powerline()
         self.assertEqual(self.powerline.append.call_args[0][0], " trunk ")
 
+    @mock.patch.dict(environ, {"USER": "root"})
     def test_different_branch(self):
         self._add_and_commit("foo")
         self._checkout_new_branch("bar")
@@ -72,4 +82,4 @@ def test_different_branch(self):
     def test_all(self, check_output):
         for stdout, result in test_cases.items():
             stats = fossil.parse_fossil_stats([stdout])
-            self.assertEquals(result, stats)
+            self.assertEqual(result, stats)
diff --git a/test/segments_test/git_stash_test.py b/test/segments_test/git_stash_test.py
index 1b228cd6..3285f906 100644
--- a/test/segments_test/git_stash_test.py
+++ b/test/segments_test/git_stash_test.py
@@ -1,5 +1,7 @@
 import unittest
-import mock
+from contextlib import ExitStack
+
+from unittest import mock
 import tempfile
 import shutil
 import sh
@@ -12,11 +14,17 @@ class GitStashTest(unittest.TestCase):
     def setUp(self):
         self.powerline = mock.MagicMock()
         self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        sh.git("init", ".")
+        with sh.pushd(self.dirname):
+            sh.git("init", ".")
+            sh.git("config", "user.name", "Test")
+            sh.git("config", "user.email", "example@example.com")
 
         self.segment = git_stash.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.dirname))
+            self.addCleanup(stack.pop_all().close)
+
     def tearDown(self):
         shutil.rmtree(self.dirname)
 
diff --git a/test/segments_test/git_test.py b/test/segments_test/git_test.py
index 373fd68f..b4e94aea 100644
--- a/test/segments_test/git_test.py
+++ b/test/segments_test/git_test.py
@@ -1,5 +1,7 @@
 import unittest
-import mock
+from contextlib import ExitStack
+
+from unittest import mock
 import tempfile
 import shutil
 import sh
@@ -16,11 +18,18 @@ def setUp(self):
         })
 
         self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        sh.git("init", ".")
+        with sh.pushd(self.dirname):
+            sh.git("init", ".")
+            sh.git("config", "user.name", "Test")
+            sh.git("config", "user.email", "example@example.com")
 
         self.segment = git.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.dirname))
+            self.addCleanup(stack.pop_all().close)
+
+
     def tearDown(self):
         shutil.rmtree(self.dirname)
 
@@ -57,7 +66,7 @@ def test_master_branch(self):
         self._add_and_commit("foo")
         self.segment.start()
         self.segment.add_to_powerline()
-        self.assertEqual(self.powerline.append.call_args[0][0], ' master ')
+        self.assertIn(self.powerline.append.call_args[0][0], [' master ', ' main '])
 
     def test_different_branch(self):
         self._add_and_commit("foo")
diff --git a/test/segments_test/hg_test.py b/test/segments_test/hg_test.py
index 004eac9c..27944e95 100644
--- a/test/segments_test/hg_test.py
+++ b/test/segments_test/hg_test.py
@@ -1,5 +1,7 @@
 import unittest
-import mock
+from contextlib import ExitStack
+
+from unittest import mock
 import tempfile
 import shutil
 import sh
@@ -26,11 +28,15 @@ def setUp(self):
         })
 
         self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        sh.hg("init", ".")
+        with sh.pushd(self.dirname):
+            sh.hg("init", ".")
 
         self.segment = hg.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.dirname))
+            self.addCleanup(stack.pop_all().close)
+
     def tearDown(self):
         shutil.rmtree(self.dirname)
 
@@ -72,4 +78,4 @@ def test_different_branch(self):
     def test_all(self, check_output):
         for stdout, result in test_cases.items():
             stats = hg.parse_hg_stats([stdout])
-            self.assertEquals(result, stats)
+            self.assertEqual(result, stats)
diff --git a/test/segments_test/hostname_test.py b/test/segments_test/hostname_test.py
index 05ae1f1b..43f2b59f 100644
--- a/test/segments_test/hostname_test.py
+++ b/test/segments_test/hostname_test.py
@@ -1,5 +1,5 @@
 import unittest
-import mock
+from unittest import mock
 import powerline_shell.segments.hostname as hostname
 from powerline_shell.themes.default import Color
 from argparse import Namespace
diff --git a/test/segments_test/svn_test.py b/test/segments_test/svn_test.py
index d7d821f8..d615ad8f 100644
--- a/test/segments_test/svn_test.py
+++ b/test/segments_test/svn_test.py
@@ -1,7 +1,9 @@
 import tempfile
 import unittest
 import shutil
-import mock
+from contextlib import ExitStack
+
+from unittest import mock
 import sh
 import powerline_shell.segments.svn as svn
 from ..testing_utils import dict_side_effect_fn
@@ -15,18 +17,24 @@ def setUp(self):
             ("vcs", "show_symbol"): False,
         })
 
-        self.dirname = tempfile.mkdtemp()
-        sh.cd(self.dirname)
-        # sh.svn("init", ".")
+        self.upstream_dir = tempfile.mkdtemp()
+        self.checkout_dir = tempfile.mkdtemp()
+        sh.svnadmin("create", self.upstream_dir)
+        sh.svn("checkout", f"file://{self.upstream_dir}", self.checkout_dir)
 
         self.segment = svn.Segment(self.powerline, {})
 
+        with ExitStack() as stack:
+            self._resource = stack.enter_context(sh.pushd(self.checkout_dir))
+            self.addCleanup(stack.pop_all().close)
+
     def tearDown(self):
-        shutil.rmtree(self.dirname)
+        shutil.rmtree(self.upstream_dir)
+        shutil.rmtree(self.checkout_dir)
 
     @mock.patch("powerline_shell.utils.get_PATH")
     def test_svn_not_installed(self, get_PATH):
-        get_PATH.return_value = "" # so svn can't be found
+        get_PATH.return_value = ""  # so svn can't be found
         self.segment.start()
         self.segment.add_to_powerline()
         self.assertEqual(self.powerline.append.call_count, 0)
diff --git a/test/segments_test/uptime_test.py b/test/segments_test/uptime_test.py
index 676b193e..b515e7e3 100644
--- a/test/segments_test/uptime_test.py
+++ b/test/segments_test/uptime_test.py
@@ -1,5 +1,5 @@
 import unittest
-import mock
+from unittest import mock
 import powerline_shell.segments.uptime as uptime
 
 test_cases = {