diff --git a/test/test_auth.py b/test/test_auth.py
index 09e3e251..c50f4d29 100644
--- a/test/test_auth.py
+++ b/test/test_auth.py
@@ -1,133 +1,146 @@
-import os.path
-import unittest
+from pathlib import Path
 
+import pytest
 import requests_mock
 
 import tableauserverclient as TSC
 
-TEST_ASSET_DIR = os.path.join(os.path.dirname(__file__), "assets")
-
-SIGN_IN_XML = os.path.join(TEST_ASSET_DIR, "auth_sign_in.xml")
-SIGN_IN_IMPERSONATE_XML = os.path.join(TEST_ASSET_DIR, "auth_sign_in_impersonate.xml")
-SIGN_IN_ERROR_XML = os.path.join(TEST_ASSET_DIR, "auth_sign_in_error.xml")
-
-
-class AuthTests(unittest.TestCase):
-    def setUp(self):
-        self.server = TSC.Server("http://test", False)
-        self.baseurl = self.server.auth.baseurl
-
-    def test_sign_in(self):
-        with open(SIGN_IN_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml)
-            tableau_auth = TSC.TableauAuth("testuser", "password", site_id="Samples")
-            self.server.auth.sign_in(tableau_auth)
-
-        self.assertEqual("eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l", self.server.auth_token)
-        self.assertEqual("6b7179ba-b82b-4f0f-91ed-812074ac5da6", self.server.site_id)
-        self.assertEqual("Samples", self.server.site_url)
-        self.assertEqual("1a96d216-e9b8-497b-a82a-0b899a965e01", self.server.user_id)
-
-    def test_sign_in_with_personal_access_tokens(self):
-        with open(SIGN_IN_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml)
-            tableau_auth = TSC.PersonalAccessTokenAuth(
-                token_name="mytoken", personal_access_token="Random123Generated", site_id="Samples"
-            )
-            self.server.auth.sign_in(tableau_auth)
-
-        self.assertEqual("eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l", self.server.auth_token)
-        self.assertEqual("6b7179ba-b82b-4f0f-91ed-812074ac5da6", self.server.site_id)
-        self.assertEqual("Samples", self.server.site_url)
-        self.assertEqual("1a96d216-e9b8-497b-a82a-0b899a965e01", self.server.user_id)
-
-    def test_sign_in_impersonate(self):
-        with open(SIGN_IN_IMPERSONATE_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml)
-            tableau_auth = TSC.TableauAuth(
-                "testuser", "password", user_id_to_impersonate="dd2239f6-ddf1-4107-981a-4cf94e415794"
-            )
-            self.server.auth.sign_in(tableau_auth)
-
-        self.assertEqual("MJonFA6HDyy2C3oqR13fRGqE6cmgzwq3", self.server.auth_token)
-        self.assertEqual("dad65087-b08b-4603-af4e-2887b8aafc67", self.server.site_id)
-        self.assertEqual("dd2239f6-ddf1-4107-981a-4cf94e415794", self.server.user_id)
-
-    def test_sign_in_error(self):
-        with open(SIGN_IN_ERROR_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml, status_code=401)
-            tableau_auth = TSC.TableauAuth("testuser", "wrongpassword")
-            self.assertRaises(TSC.FailedSignInError, self.server.auth.sign_in, tableau_auth)
-
-    def test_sign_in_invalid_token(self):
-        with open(SIGN_IN_ERROR_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml, status_code=401)
-            tableau_auth = TSC.PersonalAccessTokenAuth(token_name="mytoken", personal_access_token="invalid")
-            self.assertRaises(TSC.FailedSignInError, self.server.auth.sign_in, tableau_auth)
-
-    def test_sign_in_without_auth(self):
-        with open(SIGN_IN_ERROR_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml, status_code=401)
-            tableau_auth = TSC.TableauAuth("", "")
-            self.assertRaises(TSC.FailedSignInError, self.server.auth.sign_in, tableau_auth)
-
-    def test_sign_out(self):
-        with open(SIGN_IN_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(self.baseurl + "/signin", text=response_xml)
-            m.post(self.baseurl + "/signout", text="")
-            tableau_auth = TSC.TableauAuth("testuser", "password")
-            self.server.auth.sign_in(tableau_auth)
-            self.server.auth.sign_out()
-
-        self.assertIsNone(self.server._auth_token)
-        self.assertIsNone(self.server._site_id)
-        self.assertIsNone(self.server._site_url)
-        self.assertIsNone(self.server._user_id)
-
-    def test_switch_site(self):
-        self.server.version = "2.6"
-        baseurl = self.server.auth.baseurl
-        site_id, user_id, auth_token = list("123")
-        self.server._set_auth(site_id, user_id, auth_token)
-        with open(SIGN_IN_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(baseurl + "/switchSite", text=response_xml)
-            site = TSC.SiteItem("Samples", "Samples")
-            self.server.auth.switch_site(site)
-
-        self.assertEqual("eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l", self.server.auth_token)
-        self.assertEqual("6b7179ba-b82b-4f0f-91ed-812074ac5da6", self.server.site_id)
-        self.assertEqual("Samples", self.server.site_url)
-        self.assertEqual("1a96d216-e9b8-497b-a82a-0b899a965e01", self.server.user_id)
-
-    def test_revoke_all_server_admin_tokens(self):
-        self.server.version = "3.10"
-        baseurl = self.server.auth.baseurl
-        with open(SIGN_IN_XML, "rb") as f:
-            response_xml = f.read().decode("utf-8")
-        with requests_mock.mock() as m:
-            m.post(baseurl + "/signin", text=response_xml)
-            m.post(baseurl + "/revokeAllServerAdminTokens", text="")
-            tableau_auth = TSC.TableauAuth("testuser", "password")
-            self.server.auth.sign_in(tableau_auth)
-            self.server.auth.revoke_all_server_admin_tokens()
-
-        self.assertEqual("eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l", self.server.auth_token)
-        self.assertEqual("6b7179ba-b82b-4f0f-91ed-812074ac5da6", self.server.site_id)
-        self.assertEqual("Samples", self.server.site_url)
-        self.assertEqual("1a96d216-e9b8-497b-a82a-0b899a965e01", self.server.user_id)
+TEST_ASSET_DIR = Path(__file__).parent / "assets"
+
+SIGN_IN_XML = TEST_ASSET_DIR / "auth_sign_in.xml"
+SIGN_IN_IMPERSONATE_XML = TEST_ASSET_DIR / "auth_sign_in_impersonate.xml"
+SIGN_IN_ERROR_XML = TEST_ASSET_DIR / "auth_sign_in_error.xml"
+
+
+@pytest.fixture(scope="function")
+def server() -> TSC.Server:
+    """Fixture to create a Tableau Server instance for testing."""
+    server_instance = TSC.Server("http://test", False)
+    return server_instance
+
+
+def test_sign_in(server: TSC.Server) -> None:
+    with open(SIGN_IN_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml)
+        tableau_auth = TSC.TableauAuth("testuser", "password", site_id="Samples")
+        server.auth.sign_in(tableau_auth)
+
+    assert "eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l" == server.auth_token
+    assert "6b7179ba-b82b-4f0f-91ed-812074ac5da6" == server.site_id
+    assert "Samples" == server.site_url
+    assert "1a96d216-e9b8-497b-a82a-0b899a965e01" == server.user_id
+
+
+def test_sign_in_with_personal_access_tokens(server: TSC.Server) -> None:
+    with open(SIGN_IN_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml)
+        tableau_auth = TSC.PersonalAccessTokenAuth(
+            token_name="mytoken", personal_access_token="Random123Generated", site_id="Samples"
+        )
+        server.auth.sign_in(tableau_auth)
+
+    assert "eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l" == server.auth_token
+    assert "6b7179ba-b82b-4f0f-91ed-812074ac5da6" == server.site_id
+    assert "Samples" == server.site_url
+    assert "1a96d216-e9b8-497b-a82a-0b899a965e01" == server.user_id
+
+
+def test_sign_in_impersonate(server: TSC.Server) -> None:
+    with open(SIGN_IN_IMPERSONATE_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml)
+        tableau_auth = TSC.TableauAuth(
+            "testuser", "password", user_id_to_impersonate="dd2239f6-ddf1-4107-981a-4cf94e415794"
+        )
+        server.auth.sign_in(tableau_auth)
+
+    assert "MJonFA6HDyy2C3oqR13fRGqE6cmgzwq3" == server.auth_token
+    assert "dad65087-b08b-4603-af4e-2887b8aafc67" == server.site_id
+    assert "dd2239f6-ddf1-4107-981a-4cf94e415794" == server.user_id
+
+
+def test_sign_in_error(server: TSC.Server) -> None:
+    with open(SIGN_IN_ERROR_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml, status_code=401)
+        tableau_auth = TSC.TableauAuth("testuser", "wrongpassword")
+        with pytest.raises(TSC.FailedSignInError):
+            server.auth.sign_in(tableau_auth)
+
+
+def test_sign_in_invalid_token(server: TSC.Server) -> None:
+    with open(SIGN_IN_ERROR_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml, status_code=401)
+        tableau_auth = TSC.PersonalAccessTokenAuth(token_name="mytoken", personal_access_token="invalid")
+        with pytest.raises(TSC.FailedSignInError):
+            server.auth.sign_in(tableau_auth)
+
+
+def test_sign_in_without_auth(server: TSC.Server) -> None:
+    with open(SIGN_IN_ERROR_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml, status_code=401)
+        tableau_auth = TSC.TableauAuth("", "")
+        with pytest.raises(TSC.FailedSignInError):
+            server.auth.sign_in(tableau_auth)
+
+
+def test_sign_out(server: TSC.Server) -> None:
+    with open(SIGN_IN_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(server.auth.baseurl + "/signin", text=response_xml)
+        m.post(server.auth.baseurl + "/signout", text="")
+        tableau_auth = TSC.TableauAuth("testuser", "password")
+        server.auth.sign_in(tableau_auth)
+        server.auth.sign_out()
+
+    assert server._auth_token is None
+    assert server._site_id is None
+    assert server._site_url is None
+    assert server._user_id is None
+
+
+def test_switch_site(server: TSC.Server) -> None:
+    server.version = "2.6"
+    baseurl = server.auth.baseurl
+    site_id, user_id, auth_token = list("123")
+    server._set_auth(site_id, user_id, auth_token)
+    with open(SIGN_IN_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(baseurl + "/switchSite", text=response_xml)
+        site = TSC.SiteItem("Samples", "Samples")
+        server.auth.switch_site(site)
+
+    assert "eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l" == server.auth_token
+    assert "6b7179ba-b82b-4f0f-91ed-812074ac5da6" == server.site_id
+    assert "Samples" == server.site_url
+    assert "1a96d216-e9b8-497b-a82a-0b899a965e01" == server.user_id
+
+
+def test_revoke_all_server_admin_tokens(server: TSC.Server) -> None:
+    server.version = "3.10"
+    baseurl = server.auth.baseurl
+    with open(SIGN_IN_XML, "rb") as f:
+        response_xml = f.read().decode("utf-8")
+    with requests_mock.mock() as m:
+        m.post(baseurl + "/signin", text=response_xml)
+        m.post(baseurl + "/revokeAllServerAdminTokens", text="")
+        tableau_auth = TSC.TableauAuth("testuser", "password")
+        server.auth.sign_in(tableau_auth)
+        server.auth.revoke_all_server_admin_tokens()
+
+    assert "eIX6mvFsqyansa4KqEI1UwOpS8ggRs2l" == server.auth_token
+    assert "6b7179ba-b82b-4f0f-91ed-812074ac5da6" == server.site_id
+    assert "Samples" == server.site_url
+    assert "1a96d216-e9b8-497b-a82a-0b899a965e01" == server.user_id