diff --git a/tests/test_s3_decorators.py b/tests/test_s3_decorators.py
index 633ea255..cdb21a03 100644
--- a/tests/test_s3_decorators.py
+++ b/tests/test_s3_decorators.py
@@ -26,30 +26,42 @@ def setUp(self):
         self.patcher = patch('cgatcore.remote.aws.boto3.resource')
         self.mock_resource = self.patcher.start()
         self.mock_resource.return_value = self.mock_s3
+        self.temp_dir = tempfile.mkdtemp()
 
     def tearDown(self):
         self.patcher.stop()
+        for file in os.listdir(self.temp_dir):
+            os.remove(os.path.join(self.temp_dir, file))
+        os.rmdir(self.temp_dir)
 
     def test_s3_transform(self):
-        p = Pipeline()
+        p = Pipeline("test_s3_transform")
 
-        @P.s3_transform("s3://my-bucket/input.txt", suffix(".txt"), ".processed")
+        input_path = os.path.join(self.temp_dir, "input.txt")
+        output_path = os.path.join(self.temp_dir, "input.processed")
+
+        @P.s3_transform(input_path, suffix(".txt"), ".processed")
         def process_file(infile, outfile):
             with open(infile, 'r') as f_in, open(outfile, 'w') as f_out:
                 f_out.write(f_in.read().upper())
 
         # Simulate input file
-        self.mock_s3.storage["my-bucket/input.txt"] = "hello world"
+        with open(input_path, 'w') as f:
+            f.write("hello world")
 
         p.run()
 
-        self.assertIn("my-bucket/input.processed", self.mock_s3.storage)
-        self.assertEqual(self.mock_s3.storage["my-bucket/input.processed"], "HELLO WORLD")
+        self.assertTrue(os.path.exists(output_path))
+        with open(output_path, 'r') as f:
+            self.assertEqual(f.read(), "HELLO WORLD")
 
     def test_s3_merge(self):
-        p = Pipeline()
+        p = Pipeline("test_s3_merge")
+
+        input_files = [os.path.join(self.temp_dir, f"file{i}.txt") for i in range(1, 3)]
+        output_file = os.path.join(self.temp_dir, "merged.txt")
 
-        @P.s3_merge(["s3://my-bucket/file1.txt", "s3://my-bucket/file2.txt"], "s3://my-bucket/merged.txt")
+        @P.s3_merge(input_files, output_file)
         def merge_files(infiles, outfile):
             with open(outfile, 'w') as f_out:
                 for infile in infiles:
@@ -57,13 +69,16 @@ def merge_files(infiles, outfile):
                         f_out.write(f_in.read() + '\n')
 
         # Simulate input files
-        self.mock_s3.storage["my-bucket/file1.txt"] = "content1"
-        self.mock_s3.storage["my-bucket/file2.txt"] = "content2"
+        for i, file in enumerate(input_files, 1):
+            with open(file, 'w') as f:
+                f.write(f"content{i}")
 
         p.run()
 
-        self.assertIn("my-bucket/merged.txt", self.mock_s3.storage)
-        self.assertEqual(self.mock_s3.storage["my-bucket/merged.txt"], "content1\ncontent2\n")
+        self.assertTrue(os.path.exists(output_file))
+        with open(output_file, 'r') as f:
+            content = f.read().strip().split('\n')
+            self.assertEqual(content, ["content1", "content2"])
 
 
 if __name__ == '__main__':