diff --git a/src/wxflow/configuration.py b/src/wxflow/configuration.py
index 77cf009..e9d0cb3 100644
--- a/src/wxflow/configuration.py
+++ b/src/wxflow/configuration.py
@@ -1,6 +1,8 @@
 import glob
 import os
+import re
 import random
+import shutil
 import subprocess
 from pathlib import Path
 from pprint import pprint
@@ -94,12 +96,14 @@ def print_config(self, files: Union[str, bytes, list]) -> None:
 
     @classmethod
     def _get_script_env(cls, scripts: List) -> Dict[str, Any]:
+        varbles = dict()
         default_env = cls._get_shell_env([])
         and_script_env = cls._get_shell_env(scripts)
-        vars_just_in_script = set(and_script_env) - set(default_env)
-        union_env = dict(default_env)
-        union_env.update(and_script_env)
-        return dict([(v, union_env[v]) for v in vars_just_in_script])
+
+        for key, value in and_script_env.items():
+            if key not in default_env or default_env[key] != value:
+                varbles[key] = value
+        return varbles
 
     @staticmethod
     def _get_shell_env(scripts: List) -> Dict[str, Any]:
@@ -107,8 +111,9 @@ def _get_shell_env(scripts: List) -> Dict[str, Any]:
         runme = ''.join([f'source {s} ; ' for s in scripts])
         magic = f'--- ENVIRONMENT BEGIN {random.randint(0,64**5)} ---'
         runme += f'/bin/echo -n "{magic}" ; /usr/bin/env -0'
+        bash_path = shutil.which('bash')
         with open('/dev/null', 'w') as null:
-            env = subprocess.Popen(runme, shell=True, stdin=null.fileno(),
+            env = subprocess.Popen(runme, shell=True, executable=bash_path, stdin=null.fileno(),
                                    stdout=subprocess.PIPE)
             (out, err) = env.communicate()
         out = out.decode()
diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index 80ed966..fefc4f9 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -144,7 +144,6 @@ def test_configuration_config_dir(tmp_path, create_configs):
     assert cfg.config_dir == tmp_path
 
 
-@pytest.mark.skip(reason="fails in GH runner, passes on localhost")
 def test_configuration_config_files(tmp_path, create_configs):
     cfg = Configuration(tmp_path)
     config_files = [str(tmp_path / 'config.file0'), str(tmp_path / 'config.file1')]
@@ -157,14 +156,12 @@ def test_find_config(tmp_path, create_configs):
     assert str(tmp_path / 'config.file0') == file0
 
 
-@pytest.mark.skip(reason="fails in GH runner, passes on localhost")
 def test_parse_config1(tmp_path, create_configs):
     cfg = Configuration(tmp_path)
     f0 = cfg.parse_config('config.file0')
     assert file0_dict == f0
 
 
-@pytest.mark.skip(reason="fails in GH runner, passes on localhost")
 def test_parse_config2(tmp_path, create_configs):
     cfg = Configuration(tmp_path)
     ff = cfg.parse_config(['config.file0', 'config.file1'])