diff --git a/tests/test_csv_loader.py b/tests/test_csv_loader.py
index 41d983c..0f11ed6 100644
--- a/tests/test_csv_loader.py
+++ b/tests/test_csv_loader.py
@@ -2,6 +2,7 @@
 from unittest import TestCase
 from unittest.mock import patch, mock_open
 
+from file_test import OPEN, PATH_EXISTS, PATH_ISFILE
 from pystreamapi.loaders import csv
 
 file_content = """
@@ -9,15 +10,16 @@
 1,2.0
 a,b
 """
+file_path = 'path/to/data.csv'
 
 
 class TestCSVLoader(TestCase):
 
     def test_csv_loader(self):
-        with (patch('builtins.open', mock_open(read_data=file_content)),
-              patch('os.path.exists', return_value=True),
-              patch('os.path.isfile', return_value=True)):
-            data = csv('path/to/data.csv')
+        with (patch(OPEN, mock_open(read_data=file_content)),
+              patch(PATH_EXISTS, return_value=True),
+              patch(PATH_ISFILE, return_value=True)):
+            data = csv(file_path)
             self.assertEqual(len(data), 2)
             self.assertEqual(data[0].attr1, 1)
             self.assertIsInstance(data[0].attr1, int)
@@ -27,9 +29,9 @@ def test_csv_loader(self):
             self.assertIsInstance(data[1].attr1, str)
 
     def test_csv_loader_with_casting_disabled(self):
-        with (patch('builtins.open', mock_open(read_data=file_content)),
-              patch('os.path.exists', return_value=True),
-              patch('os.path.isfile', return_value=True)):
+        with (patch(OPEN, mock_open(read_data=file_content)),
+              patch(PATH_EXISTS, return_value=True),
+              patch(PATH_ISFILE, return_value=True)):
             data = csv('path/to/data.csv', cast_types=False)
             self.assertEqual(len(data), 2)
             self.assertEqual(data[0].attr1, '1')
@@ -40,26 +42,26 @@ def test_csv_loader_with_casting_disabled(self):
             self.assertIsInstance(data[1].attr1, str)
 
     def test_csv_loader_is_iterable(self):
-        with (patch('builtins.open', mock_open(read_data=file_content)),
-              patch('os.path.exists', return_value=True),
-              patch('os.path.isfile', return_value=True)):
-            data = csv('path/to/data.csv')
+        with (patch(OPEN, mock_open(read_data=file_content)),
+              patch(PATH_EXISTS, return_value=True),
+              patch(PATH_ISFILE, return_value=True)):
+            data = csv(file_path)
             self.assertEqual(len(list(iter(data))), 2)
 
     def test_csv_loader_with_custom_delimiter(self):
-        with (patch('builtins.open', mock_open(read_data=file_content.replace(",", ";"))),
-              patch('os.path.exists', return_value=True),
-              patch('os.path.isfile', return_value=True)):
+        with (patch(OPEN, mock_open(read_data=file_content.replace(",", ";"))),
+              patch(PATH_EXISTS, return_value=True),
+              patch(PATH_ISFILE, return_value=True)):
             data = csv('path/to/data.csv', delimiter=';')
             self.assertEqual(len(data), 2)
             self.assertEqual(data[0].attr1, 1)
             self.assertIsInstance(data[0].attr1, int)
 
     def test_csv_loader_with_empty_file(self):
-        with (patch('builtins.open', mock_open(read_data="")),
-              patch('os.path.exists', return_value=True),
-              patch('os.path.isfile', return_value=True)):
-            data = csv('path/to/data.csv')
+        with (patch(OPEN, mock_open(read_data="")),
+              patch(PATH_EXISTS, return_value=True),
+              patch(PATH_ISFILE, return_value=True)):
+            data = csv(file_path)
             self.assertEqual(len(data), 0)
 
     def test_csv_loader_with_invalid_path(self):
diff --git a/tests/test_error_handler.py b/tests/test_error_handler.py
index 80aaef8..22e4bc4 100644
--- a/tests/test_error_handler.py
+++ b/tests/test_error_handler.py
@@ -108,7 +108,7 @@ def test_remove_sentinels_no_sentinels(self):
     def test_sentinel_eq(self):
         s1 = Sentinel()
         s2 = Sentinel()
-        self.assertTrue(s1 == s2)
+        self.assertEqual(s1, s2)
 
     def test_sentinel_eq_false(self):
         s1 = Sentinel()
@@ -118,7 +118,7 @@ def test_sentinel_eq_false(self):
     def test_sentinel_ne(self):
         s1 = Sentinel()
         s2 = object()
-        self.assertTrue(s1 != s2)
+        self.assertNotEqual(s1, s2)
 
     def test_sentinel_ne_false(self):
         s1 = Sentinel()
diff --git a/tests/test_json_loader.py b/tests/test_json_loader.py
index 7532af4..7f0a164 100644
--- a/tests/test_json_loader.py
+++ b/tests/test_json_loader.py
@@ -18,7 +18,7 @@
     }
 ]
 """
-
+file_path = 'path/to/data.json'
 
 class TestJsonLoader(TestCase):
 
@@ -26,7 +26,7 @@ def test_json_loader_from_file(self):
         with (patch(OPEN, mock_open(read_data=file_content)),
               patch(PATH_EXISTS, return_value=True),
               patch(PATH_ISFILE, return_value=True)):
-            data = json('path/to/data.json')
+            data = json(file_path)
             self.assertEqual(len(data), 2)
             self.assertEqual(data[0].attr1, 1)
             self.assertIsInstance(data[0].attr1, int)
@@ -39,14 +39,14 @@ def test_json_loader_is_iterable(self):
         with (patch(OPEN, mock_open(read_data=file_content)),
               patch(PATH_EXISTS, return_value=True),
               patch(PATH_ISFILE, return_value=True)):
-            data = json('path/to/data.json')
+            data = json(file_path)
             self.assertEqual(len(list(iter(data))), 2)
 
     def test_json_loader_with_empty_file(self):
         with (patch(OPEN, mock_open(read_data="")),
               patch(PATH_EXISTS, return_value=True),
               patch(PATH_ISFILE, return_value=True)):
-            data = json('path/to/data.json')
+            data = json(file_path)
             self.assertEqual(len(data), 0)
 
     def test_json_loader_with_invalid_path(self):