Merge pull request #361 from SebastiaanZ/attach-cause-to-improperly-c…

…onfigured-exception Attach cause to ImproperlyConfigured exception
joke2k · Jan 2, 2022 · dc3b775 · dc3b775
2 parents 0e9eba6 + f253eb3
commit dc3b775
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/environ/environ.py b/environ/environ.py
@@ -366,10 +366,10 @@ def get_value(self, var, cast=None, default=NOTSET, parse_default=False):
 
         try:
             value = self.ENVIRON[var]
-        except KeyError:
+        except KeyError as exc:
             if default is self.NOTSET:
                 error_msg = "Set the {} environment variable".format(var)
-                raise ImproperlyConfigured(error_msg)
+                raise ImproperlyConfigured(error_msg) from exc
 
             value = default
 

diff --git a/tests/test_env.py b/tests/test_env.py
@@ -45,6 +45,7 @@ def test_not_present_without_default(self):
         with pytest.raises(ImproperlyConfigured) as excinfo:
             self.env('not_present')
         assert str(excinfo.value) == 'Set the not_present environment variable'
+        assert excinfo.value.__cause__ is not None
 
     def test_contains(self):
         assert 'STR_VAR' in self.env