diff --git a/.coveragerc b/.coveragerc
index a709d91..232a67e 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -11,4 +11,5 @@ exclude_lines =
 ignore_errors = True
 omit =
     benchmark/__init__.py
-    benchmark/_version.py
\ No newline at end of file
+    benchmark/_version.py
+    benchmark/tests/*
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index a15cb7d..dc31840 100644
--- a/.gitignore
+++ b/.gitignore
@@ -102,7 +102,7 @@ celerybeat.pid
 *.sage.py
 
 # Environments
-.env
+/.env
 .venv
 env/
 venv/
diff --git a/benchmark/Utils.py b/benchmark/Utils.py
index 576810b..baf6539 100644
--- a/benchmark/Utils.py
+++ b/benchmark/Utils.py
@@ -102,14 +102,13 @@ class Files:
         return None
 
     def get_all_results(self, hidden) -> list[str]:
-        first_path = "."
-        first_try = os.path.join(
-            first_path, Folders.hidden_results if hidden else Folders.results
+        result_path = os.path.join(
+            ".", Folders.hidden_results if hidden else Folders.results
         )
-        if os.path.isdir(first_try):
-            files_list = os.listdir(first_try)
+        if os.path.isdir(result_path):
+            files_list = os.listdir(result_path)
         else:
-            raise ValueError(f"{first_try} does not exist")
+            raise ValueError(f"{result_path} does not exist")
         result = []
         prefix, suffix = self.results_suffixes()
         for result_file in files_list:
@@ -143,17 +142,12 @@ class EnvDefault(argparse.Action):
     # Thanks to https://stackoverflow.com/users/445507/russell-heilling
     def __init__(self, envvar, required=True, default=None, **kwargs):
         self._args = EnvData.load()
-        if not default and envvar in self._args:
-            default = self._args[envvar]
-        if required and default:
-            required = False
+        default = self._args[envvar]
+        required = False
         super(EnvDefault, self).__init__(
             default=default, required=required, **kwargs
         )
 
-    def __call__(self, parser, namespace, values, option_string=None):
-        setattr(namespace, self.dest, values)
-
 
 class TextColor:
     BLUE = "\033[94m"
diff --git a/benchmark/tests/.env b/benchmark/tests/.env
new file mode 100644
index 0000000..819f93f
--- /dev/null
+++ b/benchmark/tests/.env
@@ -0,0 +1,7 @@
+score=accuracy
+platform=iMac27
+n_folds=5
+model=ODTE
+stratified=0
+# Source of data Tanveer/Surcov
+source_data=Tanveer
diff --git a/benchmark/tests/Util_test.py b/benchmark/tests/Util_test.py
index 8b0f62a..04c00d4 100644
--- a/benchmark/tests/Util_test.py
+++ b/benchmark/tests/Util_test.py
@@ -132,6 +132,29 @@ class UtilTest(unittest.TestCase):
             ["results_accuracy_STree_iMac27_2021-11-01_23:55:16_0.json"],
         )
 
+    def test_Files_get_results_Error(self):
+        os.chdir(os.path.dirname(os.path.abspath(__file__)))
+        # check with results
+        os.rename(Folders.results, f"{Folders.results}.test")
+        try:
+            Files().get_all_results(hidden=False)
+        except ValueError:
+            pass
+        else:
+            self.fail("Files.get_all_results() should raise ValueError")
+        finally:
+            os.rename(f"{Folders.results}.test", Folders.results)
+        # check with hidden_results
+        os.rename(Folders.hidden_results, f"{Folders.hidden_results}.test")
+        try:
+            Files().get_all_results(hidden=True)
+        except ValueError:
+            pass
+        else:
+            self.fail("Files.get_all_results() should raise ValueError")
+        finally:
+            os.rename(f"{Folders.hidden_results}.test", Folders.hidden_results)
+
     def test_Symbols(self):
         self.assertEqual(Symbols.check_mark, "\N{heavy check mark}")
 
@@ -156,6 +179,13 @@ class UtilTest(unittest.TestCase):
         self.assertDictEqual(computed, expected)
 
     def test_EnvDefault(self):
+        expected = {
+            "score": "accuracy",
+            "platform": "iMac27",
+            "n_folds": 5,
+            "model": "ODTE",
+            "stratified": "0",
+        }
         ap = argparse.ArgumentParser()
         ap.add_argument(
             "-s",
@@ -178,6 +208,8 @@ class UtilTest(unittest.TestCase):
         ap.add_argument(
             "-m",
             "--model",
+            action=EnvDefault,
+            envvar="model",
             type=str,
             required=True,
             help="model name",
@@ -200,20 +232,26 @@ class UtilTest(unittest.TestCase):
             required=True,
             help="Stratified",
         )
-        # ap.add_argument(
-        #     "--title",
-        #     type=str,
-        #     required=True,
-        # )
-        # args = ap.parse_args([
-        #         "--title",
-        #         "test",
-        #     ])
-        # args = ap.parse_known_args(namespace=unittest)
-        # computed = args.__dict__
-        # for key, value in expected.items():
-        #     self.assertEqual(computed[key], value)
-        # print(computed)
+        ap.add_argument(
+            "--title",
+            type=str,
+            required=True,
+        )
+        ap.add_argument(
+            "--test",
+            type=str,
+            required=False,
+            default=None,
+        )
+        args = ap.parse_args(
+            [
+                "--title",
+                "test",
+            ],
+        )
+        computed = args.__dict__
+        for key, value in expected.items():
+            self.assertEqual(computed[key], value)
 
     def test_TextColor(self):
         self.assertEqual(TextColor.BLUE, "\033[94m")